Ayad M. Takhakh
AL-Nahrain university, Mechanical Engineering Department, Faculty Member
- Asst. Prof. Ayad M. Takhakhedit
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Cu-Al-Ni shape memory alloy specimens has been fabricated using powder metallurgy technique with tube furnace and vacuum sintering environment , three range of Nb powder weight percentage (0.3,0.6,0.9)% has been added. Micro hardness and... more
Cu-Al-Ni shape memory alloy specimens has been fabricated using powder metallurgy technique with tube furnace and vacuum sintering environment , three range of Nb powder weight percentage (0.3,0.6,0.9)% has been added. Micro hardness and sliding wear resist has been tested followed by X-ray diffraction, scanning electron microscope (SEM) and energy dispersive X-ray spectroscope (EDX) for micro structure observation. The experimental test for the samples has showed that the increase of Nb powder weight percentage in the master alloy has a significant effect on increasing the hardness and decreasing the wear resist therefore it will enhance the mechanical properties for this alloy.
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This article introduced a three-dimension CAD model of a prosthesis testing platform using SolidWorks software to conduct a kinematic and dynamic analysis of the transfemoral prosthesis of the virtual model. Concurrently, the event-based... more
This article introduced a three-dimension CAD model of a prosthesis testing platform using SolidWorks software to conduct a kinematic and dynamic analysis of the transfemoral prosthesis of the virtual model. Concurrently, the event-based motion simulation (EBMS) procedure was carried out on the CAD model. The concept of the operational strategy of the test platform was clarified through the machine’s real-life experience before being constructed in vitro. The platform model is capable of reproducing two active movements to simulate the locomotion of the thigh angle and hip vertical displacement for assessing the artificial knee angle motion during the gait cycle. These motions were controlled by two rotary forces (motors) that are utilized to implement control actions in EBMS. The prosthetic knee joint was built with a single axis that performs flexion and extension via the axial force of the spring. The simulation results of the thigh angle motion ranged from 2 0 ° 2{0}^{^\circ } t...
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This study deals with evaluation of smart economic transfemral Prosthetic consist of a new design and manufacturing of knee joint and design and manufacture of a simple electronic circuit that is programmed to control the muscle pressure... more
This study deals with evaluation of smart economic transfemral Prosthetic consist of a new design and manufacturing of knee joint and design and manufacture of a simple electronic circuit that is programmed to control the muscle pressure on the sensor during movement and transfer the voltage of force sensor after processing in microcontroller to the electric motor to flexion and extend the knee joint. A number of tests were carried out to evaluate the smart prosthetic. Gait cycle and EMG tests were performed on a patient with amputation above the knee in two cases, the first is when the patient is wearing the traditional limb and the second is when the patient is wearing the smart prosthetic. The results showed that the gait cycle during the wearing of the smart prosthetic is more acceptable, stable and balanced than the case of the traditional prosthetic wear. The results of EMG test showed that muscles need less effort during movement when wearing a smart limb and this indicates t...
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Modifying buckling behavior of the composite structure has been investigated in the recent few years with different reinforcement fiber and powder materials and nanomaterials. It can be seen from previous studies that the addition of... more
Modifying buckling behavior of the composite structure has been investigated in the recent few years with different reinforcement fiber and powder materials and nanomaterials. It can be seen from previous studies that the addition of nanomaterials leads to a significant modification in the buckling behavior of structure by using a low mount of nanomaterials. In this work, reinforcement of composite materials using two types of nanomaterials together, SiO2 and Al2O3 nanomaterials, to modify the buckling behavior for plate structure is studied. Therefore, the investigation was done experimentally and numerically. The experimental work is performed by manufacturing composite plates with various weight fractions with the nanoeffect, and then their mechanical properties and buckling characterization were evaluated. The numerical work was done using the finite element method to estimate the plate structure’s buckling behavior with various nanomaterials effects. A comparison between the ex...
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The main problem with designing prostheses is the ability to assess newly manufactured devices on patients under unsafe conditions. Some of the issues that obstruct the testing process of the prosthetic limbs on amputees are informed... more
The main problem with designing prostheses is the ability to assess newly manufactured devices on patients under unsafe conditions. Some of the issues that obstruct the testing process of the prosthetic limbs on amputees are informed consent, safety straps, and inadequate repetitiveness. This paper introduced a literature study regarding prosthesis testing platforms in which the sagittal plane is considered in all motions and forces. The article focused on the mechanical design, the actuator system, and the control strategies of test platforms to assess the functional characteristics of a prosthetic lower limb, such as the types of movements and loads, the technologies adopted, and the types of control techniques that have been used to design closedloop motion. Furthermore, this study illustrated the performance test of a prosthetic limb through kinematic and kinetic measurement. In conclusion, these problems can be solved by utilizing robotic testing, which provides extra benefits that can be activated for a long time and working in environments that are dangerous for patients
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The effect of welding parameters on mechanical properties of aluminum alloy 3003 H14 Friction stir-welded (FSW) joints were investigated in the present study. Different welded specimens were produced by employing variable rotating speeds... more
The effect of welding parameters on mechanical properties of aluminum alloy 3003 H14 Friction stir-welded (FSW) joints were investigated in the present study. Different welded specimens were produced by employing variable rotating speeds (1000, 1250, 1500, 2000 r.p.m.), and welding speeds (20, 40, 60, 80 mm/min). Microhardness measurements and tensile strength of the produced joints were tested. The experimental results indicated that the process parameters have a significant effect on mechanical properties of joints. The optimum results of the weld gained at the parameter 80mm/min weld speed and 1500 rpm rotation speed where the efficiency reaches to 89% of the ultimate tensile strength of the parent metal
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Friction stir processing is a new method of changing the properties of a metal through intense, localized plastic deformation ,this process mixes the material without changing the phase (by melting or otherwise) and creates a micro... more
Friction stir processing is a new method of changing the properties of a metal through intense, localized plastic deformation ,this process mixes the material without changing the phase (by melting or otherwise) and creates a micro structure with fine, equiaxedgrains, It is used to improve the micro structural properties of metals. In this paper , the enhancement of mechanical properties of friction stir welding specimens at variable rotation speeds (1100,1300 and 1500 rpm ) with constant feed speed(60 mm/min) for 6061-T6 aluminum alloy is studied by using the friction stir processing method at the same variable rotation speed and feed speed in order to transform a heterogeneous micro structure to a more homogeneous, refined micro structure. The best results of the weld gained at the parameter 60 mm/min weld speed and 1300 RPM rotation speed for the FSW and FSP where the efficiency reaches to 84.61% for FSW and 89.05% for FSP of the ultimate tensile strength of the parent metal .Thi...
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In this study a Nickel-Titanium-Cupper shape memory alloys was manufactured by powder metallurgy (PM) technique, powder mixture of 50% Ti , 47% Ni and 3% Cu was prepared by mixing for two hours and compacted in a press machine using... more
In this study a Nickel-Titanium-Cupper shape memory alloys was manufactured by powder metallurgy (PM) technique, powder mixture of 50% Ti , 47% Ni and 3% Cu was prepared by mixing for two hours and compacted in a press machine using various compacting pressure (600, 700 and 800) MPa , sample was then sintered for 5 hrs in an electrical tube vacuum furnace using sintering temperature of (850˚C, 900˚C and 950˚C) .phase analysis of samples was conducted by X-ray diffraction test, the effect of different sintering temperature and compacting pressure on the porosity, microhardness ,compression strength and the shape memory effect (SME) was studied, the result showed decrease in the porosity and increasing in the shape recovery ,compression strength and microhardness with increasing compacting pressure and at lower sintering temperature and hence the best results was at 800MPa compacting pressure and 850˚C sintering temperature.
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In this work, numerical method approach has been used to simulate the solidification parameters of an eutectic aluminum-silicon alloy in chilled metallic mould with copper. The approach is based on the solution of heat flow equations of... more
In this work, numerical method approach has been used to simulate the solidification parameters of an eutectic aluminum-silicon alloy in chilled metallic mould with copper. The approach is based on the solution of heat flow equations of the casting and mould. In addition, the latent heat is treated as a boundary condition between the liquid and solid phase. The results showed that different behaviors of solidification parameters are obtained along the casting. Furthermore, the simulation approach of solidification parameters in conjunction with the microstructure indicated that it is possible, to a large degree, giving a knowledge about the microstructural features for any alloy system. الخالصة تم البحث هذا في االلمنيوم لسبيكة التجمد ات متغير محاكاة في قمية الر يقة الطر استخدام-معدني قالب في االيوتكتيكية سميكون اذ .النحاس من بمصقع مزود تستند .القالب و لممسبوكة ة ار الحر انسياب معادالت حل عمى المستخدمة يقة...
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AA3003-H14 aluminum alloy plates were welded by friction stir welding and TIG welding. Fatigue properties of the welded joints were evaluated based on the superior tensile properties for FSW at 1500 rpm rotational speed and 80 mm/min... more
AA3003-H14 aluminum alloy plates were welded by friction stir welding and TIG welding. Fatigue properties of the welded joints were evaluated based on the superior tensile properties for FSW at 1500 rpm rotational speed and 80 mm/min welding speed. However, there is not much information available on effect of welding parameters with evolution of fatigue life of friction stir welds. The present study experimentally analyzed fatigue properties for base, FSW, and TIG welds of AA 3003-H14 aluminum alloy. Fatigue properties of FSW joints were slightly lower than the base metal and higher than TIG welding. ةصلاخلا عون موينملا ةكيبس ماحل مت AA3003-H14 مادختساب جزملاب يآاكتحلاا ماحللا ةقيرط FSW مادختساب كلذآو لماخلا نتسكنتلا زاغب ماحللا ةقيرط TIG . تاموحلملل للاكلا صاوخ ةسارد مت دقو و لاا ندعملل ساس ، تاموحلمل ةبسنلابو FSW فآ لضفا رايتخا مت ا ةء ةينارود ةعرس دنع ماحل ١٥٠٠ ةرود / ماحل ةعرسو ةقيقد ٨٠ ملم / ةقيقد ، لوح ةيفاآ تامولعم رفوت مدعل و ماحل تاريغتم ريثأت FSW تاموحلمل للاكلا صاوخ ةسارد ثحبلا اذه يف مت للاكلا صاوخ ىلع FSW ندعملاب اهتنراقمو ساسلاا ماحللا ةقيرطبو TIG ا ةلداعم للاخ نم حئاتنلا تنيبو تاموحلم نا رمعل FSW ندعملا نم لاًيلق لقا للاآ صاوخ كلتمت تاموحلم نم ىلعاو ساسلاا TIG .
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The aim of the present study is to investigate the influence of thermal variables on the as-cast microstructure of hypoeutectic and eutectic Al–Si alloys and to establish correlation between the solidification thermal parameters and... more
The aim of the present study is to investigate the influence of thermal variables on the as-cast microstructure of hypoeutectic and eutectic Al–Si alloys and to establish correlation between the solidification thermal parameters and interparticle spacing for Al–12%Si alloy during the unidirectional solidification. New relationships are suggested based on the image processing programs in order to accurately quantify the microstructure evolution. A numerical approach is developed to quantitatively determine solidification thermal variables such as growth rate (interface velocity), temperature gradient, cooling rate, and local solidification time. The experimental microstructure measurements are combined with numerical solutions using finite difference (FD) and control volume (CV) methods, and models are obtained for this structure with solidification parameters. Applying image processing program with relationships suggested in this study gives more accuracy to compute interparticle sp...
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Knee ankle foot orthoses (KAFOs) are used by paraplegia patients with low level spinal cord injury and having well control of the stem muscles. Four layers of carbon fiber with C- orthocryl lamination resin are used for manufacturing the... more
Knee ankle foot orthoses (KAFOs) are used by paraplegia patients with low level spinal cord injury and having well control of the stem muscles. Four layers of carbon fiber with C- orthocryl lamination resin are used for manufacturing the knee ankle foot orthoses in this work. The mechanical properties of most of the components materials were estimated with the aid of fatigue and tensile test machines. Results of the tensile tests showed that the mechanical properties: yield stress, ultimate strength and modulus of elasticity were 92MPa, 105.7MPa and 2GPa respectively. The value of amidst pressure between the patient limb and the manufactured KAFO was measured using (F-socket) Mat scan sensor and these values of pressure were (663kPa) and (316kPa) for the thigh and calf regions respectively.
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Friction stir welding is a relatively new joining process, which involves the joining of metals without fusion or filler materials. The amount of the heat conducted into the work piece dictates a successful process which is defined by the... more
Friction stir welding is a relatively new joining process, which involves the joining of metals without fusion or filler materials. The amount of the heat conducted into the work piece dictates a successful process which is defined by the quality, shape and microstructure of the processed zone, as well as the residual stress and the distortion of the work piece.
Research Interests: Materials Science, Heat Transfer, Friction Stir Welding, Welding, Temperature, and 15 moreTemperature Distribution, Alloy, Thermal Conductivity, Mechanical Testing, Finite element simulation, Heat Conduction, Aluminium, Microstructures, Residual Stress, Specific Heat, Aluminium Alloy, Simulation Model, Tensile Test, Mechanical Tests, and HARDNESS TEST
ABSTRACT
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A standard knee-ankle-foot orthosis (KAFO) is typically prescribed to support the limb during locomotion, during which (KAFO) is used for people with isolated quadriceps weakness or paralysis. In this paper the measurement applied on girl... more
A standard knee-ankle-foot orthosis (KAFO) is typically prescribed to support the limb during locomotion, during which (KAFO) is used for people with isolated quadriceps weakness or paralysis. In this paper the measurement applied on girl undergoing palsy children in her left leg as a case study. The first pathological concern is of age, weight, length and the residual palsy limb of 30 years old, 59kg, 156 cm, and 76 cm respectively, while the second test done is on man suffering flexion knee and shorten left leg due to injection by a needle in a wrong position when he was a child. The pathological concern is of age, weight, length and the residual defect limb of 35years, 82kg, 172 cm, and 80 cm respectively. This work involves two major parts: the first of which is the experimental part to measure the ground reaction force for both healthy and intake legs. The interface pressure between leg and calf part is measured for twelve points covering the total KAFO surface area, while the ...
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The main problem of the prosthetic limb design is the ability to test recently developed devices on amputee and testing in dangerous circumstances. In the present study, a virtual model of trans-femoral prosthesis test platform was... more
The main problem of the prosthetic limb design is the ability to test recently developed devices on amputee and testing in dangerous circumstances. In the present study, a virtual model of trans-femoral prosthesis test platform was designed using SolidWorks® 2018 Software that simulates a dynamic model during the gait cycle. The purpose of this prosthesis model is to replicate the walking technique as close to a healthy leg within the sagittal plane for calculating both range of motion (ROM) and ground reaction force (GRF). The simulator model consists of three degrees of freedom (DOF) that are controlled employing three actuators. It is used for the flexion and extension of the thigh and knee joint of the prosthesis model. As well as the vertical displacement hip joint. The obtained results from simulation provided ROM of the hip joint that is about 23o and -15o and full flexion of the knee joint is about 47o. on the other hand, the maximum peak of GRF is about 725N when applying a...
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Friction stir processing is a new method of changing the properties of a metal through intense, localized plastic deformation ,this process mixes the material without changing the phase (by melting or otherwise) and creates a micro... more
Friction stir processing is a new method of changing the properties of a metal through intense, localized plastic deformation ,this process mixes the material without changing the phase (by melting or otherwise) and creates a micro structure with fine, equiaxedgrains, It is used to improve the micro structural properties of metals. In this paper , the enhancement of mechanical properties of friction stir welding specimens at variable rotation speeds (1100,1300 and 1500 rpm ) with constant feed speed(60 mm/min) for 6061-T6 aluminum alloy is studied by using the friction stir processing method at the same variable rotation speed and feed speed in order to transform a heterogeneous micro structure to a more homogeneous, refined micro structure. The best results of the weld gained at the parameter 60 mm/min weld speed and 1300 RPM rotation speed for the FSW and FSP where the efficiency reaches to 84.61% for FSW and 89.05% for FSP of the ultimate tensile strength of the parent metal .Thi...
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The aim of the present study is to investigate the influence of thermal variables on the as-cast microstructure of hypoeutectic and eutectic Al-Si alloys and to establish correlation between the solidifica- tion thermal parameters and... more
The aim of the present study is to investigate the influence of thermal variables on the as-cast microstructure of hypoeutectic and eutectic Al-Si alloys and to establish correlation between the solidifica- tion thermal parameters and interparticle spacing for Al-12%Si alloy during the unidirectional solidification. New relationships are suggested based on the image processing programs in order to accurately quantify the microstructure evolution. A numerical approach is developed to quantitatively determine solidification thermal variables such as growth rate (interface velocity), temperature gradient, cooling rate, and local solidification time. The experimental microstructure measurements are combined with numerical solutions using finite dif- ference (FD) and control volume (CV) methods, and models are obtained for this structure with solidification parameters. Applying image processing program with relationships suggested in this study gives more accuracy to compute interparticl...
This paper investigates the effect of heat treatment on the mechanical properties (yield and ultimate strength, elongation, hardness, and modulus of elasticity) and dynamic characteristics (natural frequency and dynamic response) under... more
This paper investigates the effect of heat treatment on the mechanical properties (yield and ultimate strength, elongation, hardness, and modulus of elasticity) and dynamic characteristics (natural frequency and dynamic response) under impulse loading for 6061 and 2024 aluminum alloys in O, T4, and T6 treatment conditions to study the effect of heat treatments. The study was conducted by implementing various techniques. The first step was to evaluate the mechanical properties and the natural frequency for the aluminum alloys; this was performed experimentally, after undergoing various heat treatment methods. In the second part of his study a numerical method (finite element) and he natural frequency was calculated for an aluminum plate after which a comparison was made with the results that were obtained experimentally, also the dynamic response for a plate under impulse load was evaluated numerically. Finally evaluating the dynamic plate response analytically by solution the genera...
Friction Stir Welding (FSW) is one of the most effective solid states joining process, FSP is used to modify the microstructure of FSW welded zone. These processes used in many applications that require sheet forming process. In... more
Friction Stir Welding (FSW) is one of the most effective solid states joining process, FSP is used to modify the microstructure of FSW welded zone. These processes used in many applications that require sheet forming process. In comparison to other welding processes FSW have better formability.The objective of this experiment was to show the effects that varying rotational speed and travel speed on the formability of a friction stir weld. In this work , the joining of 3 mm AA 2024-O aluminum alloy was achieved using the friction stir processing FSP and friction stir welding FSW using the rotational speeds (rpm) 1000 , 1250 , and 1500 rpm rotational speed and 40, 60, 80 mm/min travel speed.The formability of friction stir welded AA 2024-O aluminum alloy sheets were investigated by means of Load–Deflection curve with bending test. From the force-displacement behaviour for the aluminum welds it can be concluded that because of no cracking was observed in the weld zone for most weld she...
This study includes two main parts: The first part includes the process of manufacturing and testing partial foot orthosis for a patient suffering from partial foot amputation. The orthosis was manufactured from lamination... more
This study includes two main parts: The first part includes the process of manufacturing and testing partial foot orthosis for a patient suffering from partial foot amputation. The orthosis was manufactured from lamination Perlon-Carbon-Perlon (4-2-4) and then tested with Force plate and F-Socket. The patient was tested in two cases: the first without wearing the orthosis and the second after wearing the orthosis. The results of gait cycle test show that the gait cycle of the patient was improved dramatically after wearing the orthosis as compared with his state without wearing the orthotic. The second part of the research involves the analysis of orthosis for all types of used materials by using the engineering analysis program (ANSYS V.15). A model of the manufactured orthosis was designed, the safety factor of fatigue and total deformation were calculated. The results of engineering analysis show the difference in safety factor between the plastic and composite materials which ha...
In this study a Nickel-Titanium-Cupper shape memory alloys was manufactured by powder metallurgy (PM) technique, powder mixture of 50% Ti , 47% Ni and 3% Cu was prepared by mixing for two hours and compacted in a press machine using... more
In this study a Nickel-Titanium-Cupper shape memory alloys was manufactured by powder metallurgy (PM) technique, powder mixture of 50% Ti , 47% Ni and 3% Cu was prepared by mixing for two hours and compacted in a press machine using various compacting pressure (600, 700 and 800) MPa , sample was then sintered for 5 hrs in an electrical tube vacuum furnace using sintering temperature of (850˚C, 900˚C and 950˚C) .phase analysis of samples was conducted by X-ray diffraction test, the effect of different sintering temperature and compacting pressure on the porosity, microhardness ,compression strength and the shape memory effect (SME) was studied, the result showed decrease in the porosity and increasing in the shape recovery ,compression strength and microhardness with increasing compacting pressure and at lower sintering temperature and hence the best results was at 800MPa compacting pressure and 850˚C sintering temperature.
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Fatigue characteristics of as-cast acicular ductile iron (ASGI) produced by alloying and controlled cooling and as-rolled 42CrMo4 steel were studied. Rotating bending fatigue tests at a stress ratio of R = -1 was employed. Tests included... more
Fatigue characteristics of as-cast acicular ductile iron (ASGI) produced by alloying and controlled cooling and as-rolled 42CrMo4 steel were studied. Rotating bending fatigue tests at a stress ratio of R = -1 was employed. Tests included constant stress amplitude loading, variable stress amplitude high-low, low-high loading and coaxing. S - N curves were established and fatigue strengths were determined, (450 N/mm2 for ASGI, 460 N/mm2 for steel). The variable stress amplitude loading, high-low, showed high NT/Nf for the materials, while variable stress amplitude loading, low-high showed a decrease in NT/Nf for steel and only small improvement for ASGI (NT = total stress cycles in variable stress amplitude, Nf = stress cycles in constant stress amplitude to failure). Both materials showed coaxing effect, pronounced more in ASGI. The crack propagation rate determined using Paris equation at constant stress amplitude for ASGI was
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The aim of present paper is to measure the stresses that results from vibration for knee-Ankle-Foot-orthosis (KAFO) at different position during dress up by patient by measuring of accelerometer of (KAFO).Also the pressure between leg and... more
The aim of present paper is to measure the stresses that results from vibration for knee-Ankle-Foot-orthosis (KAFO) at different position during dress up by patient by measuring of accelerometer of (KAFO).Also the pressure between leg and knee -AnkleFoot-orthosis was measured by using piezoelectric sensor. Total stresses result from applied pressure and acceleration on the KAFO numerically calculated with ANSYS 14 package. The results showed that the values of stresses at the upper KAFO (thigh) are greater than the lower KAFO(shank).this is certainly because of the values of pressure in the upper leg
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This work covered the experimental program to obtain the mechanical properties of the ankle Foot Ortheses (AFO) composite materials by using tensile, flexural and fatigue tests. They are composed of number of layers (12 layers) perlon... more
This work covered the experimental program to obtain the mechanical properties of the ankle Foot Ortheses (AFO) composite materials by using tensile, flexural and fatigue tests. They are composed of number of layers (12 layers) perlon with two lyers of carbon-fiber and (10 layers) without carbon fiber. Also, the Ground Reaction Force (GRF), Center of Pressure (COP) and pressure distribution were determined experimentally for patients (first is about (42)year old with height (173cm) and weight (82kg) and the second about (10) years old with height (130cm) and weight (23 kg)) with and without AFO. The results showed that the ultimate stress (Ϭult) for perlon 31 MPa, for perlon with carbon fiber of matrix (80:20) 36MPa and perlon with carbon fiber of matrix C-orthocryl 55 MPa. The Fatigue life equation for perlon is Ϭ=33.64(Nf) -0.30 and for perlon with carbon fiber Ϭ=60.98(Nf) -0.33 . The fatigue limit for perlon is 16MPa and for perlon with carbon fiber 28MPa. The GRF data were measu...
The effect of Cu addition on the physical and mechanical properties of Nickel-Titanium (weight percentage ) shape memory alloy were investigated , density , porosity , compression strength ,Shape Effect (strain recovery), ,micro-hardness... more
The effect of Cu addition on the physical and mechanical properties of Nickel-Titanium (weight percentage ) shape memory alloy were investigated , density , porosity , compression strength ,Shape Effect (strain recovery), ,micro-hardness , Conducted to estimate the Cu effect ,a Different amount of Cu (2%,5%,10% ) weight percent were added with different compactingPressure (450MPa and 600MPa). Significant effect on master alloys properties especially the alloys that have 5%Cu and 10%Cu has been observed.
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Friction Stir Processing (FSP) technology was wielded to output the Al7075/ Al2O3 surface composite. The effects parameters of processing method on particle distribution have been studied. The microstructure and mechanical characteristics... more
Friction Stir Processing (FSP) technology was wielded to output the Al7075/ Al2O3 surface composite. The effects parameters of processing method on particle distribution have been studied. The microstructure and mechanical characteristics of the samples were examined using the optical microscope, SEM and hardness examination. Acquired consequences, showed that Al2O3 particles were in a good interior distribution inside the basement. This technique produced excellent bonding between the surface composite and the base material. On other hand the surface hardness was increased about 25% as compared with the substrate. In addition, grain matrix refinement and enhanced particle distribution were obtained after each FSP pass. Also the dispersion of Al2O3 particles in the stirred area became more homogeneous and the average hardness improved by increasing the number of passes.
In this study, an experimental comparison has been made between the traditional plastic materials (Polypropylene and Polyethylene) and selected composite materials (Perlon-Carbon-Perlon and Hybrid Carbon fiber-Glass fiber) to manufacture... more
In this study, an experimental comparison has been made between the traditional plastic materials (Polypropylene and Polyethylene) and selected composite materials (Perlon-Carbon-Perlon and Hybrid Carbon fiber-Glass fiber) to manufacture a long life Partial Foot Prosthesis. To improve the mechanical properties, increase the lifetime of the prosthesis, and reduce the cost to the patient, two types of composite materials were used and compared with plastic materials. Samples were manufactured and tested with different test methods (Tensile, flexural, and fatigue test). All tests were performed at room temperature.The results showed that the composite materials achieve a large increment in mechanical properties such as (σy, σult, E, σb, and Ef) whichwere increased to a percentage of (200% - 261%),(330% - 243%), (295% - 203%), (276% - 270%),and (413% - 301%) in Perlon-Carbon-Perlonlamination as compared with Polypropylene andPolyethylene respectively. However theincreasing percentage in...
This study focuses on the manufacturing of Nickel-Titanium-Cupper shape memory alloys using powder metallurgy (PM) method, 50% Ti, 47% Ni and 3% Cu powder mixture was prepared by mixing in a ball mill for two hours and compacted in a... more
This study focuses on the manufacturing of Nickel-Titanium-Cupper shape memory alloys using powder metallurgy (PM) method, 50% Ti, 47% Ni and 3% Cu powder mixture was prepared by mixing in a ball mill for two hours and compacted in a press machine using various compacting pressure (600, 700 and 800) MPa, samples was then sintered in an electrical tube furnace using three sintering temperature of (850, 900 and 950) ̊C. Optimization of the shape memory effect (SME) using Minitab program was conducted; the result showed increasing in the shape recovery with increasing of compacting pressure and reduction in sintering temperature. Copyright © 2016 International Energy and Environment Foundation All rights reserved.
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Modifying buckling behavior of the composite structure has been investigated in the recent few years with different reinforcement fiber and powder materials and nanomaterials. It can be seen from previous studies that the addition of... more
Modifying buckling behavior of the composite structure has been investigated in the recent few years with different reinforcement fiber and powder materials and nanomaterials. It can be seen from previous studies that the addition of nanomaterials leads to a significant modification in the buckling behavior of structure by using a low mount of nanomaterials. In this work, reinforcement of composite materials using two types of nanomaterials together, SiO2 and Al2O3 nanomaterials, to modify the buckling behavior for plate structure is studied. Therefore, the investigation was done experimentally and numerically. The experimental work is performed by manufacturing composite plates with various weight fractions with the nano effect, and then their mechanical properties and buckling characterization were evaluated. The numerical work was done using the finite element method to estimate the plate structure’s buckling behavior with various nanomaterials effects. A comparison between the e...
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Friction stir processing is a new method of changing the properties of a metal through intense, localized plastic deformation ,this process mixes the material without changing the phase (by melting or otherwise) and creates a... more
Friction stir processing is a new method of changing the properties of a metal through intense, localized plastic deformation ,this process mixes the material without changing the phase (by melting or otherwise) and creates a microstructure with fine, equiaxedgrains , It is used to improve the microstructural properties of metals. In this paper , the enhancement of mechanical properties of friction stir welding specimens at variable rotation speeds (1500,1700 and 1900 rpm ) with constant feed speed(40mm/min) for 7075-T73 aluminum alloy is studied by using the friction stir processing method at the same variable rotation speed and feed speed in order to transform a heterogeneous microstructure to a more homogeneous, refined microstructure. The best results of the weld gained at the parameter 40 mm/min weld speed and 1700RPM rotation speed for the friction stir welding (FSW) and friction stir processing (FSP) where the efficiency reaches to 83.7% for FSW and 92.99% for FSP of the ultimate tensile strength of the parent metal.
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In present work, the improving of mechanical properties for welded joint of Al7075-T651 is done using friction stir processing for joint surface by adding SiC particles into surface joint. Strength properties and microhardness of the... more
In present work, the improving of mechanical properties for welded joint of Al7075-T651 is done using friction stir processing for joint surface by adding SiC particles into surface joint. Strength properties and microhardness of the processing joints has been investigated and compared with welded joint of alloy Al7075-T651. It is recorded that the friction stir processed sample possesses higher hardness than which of AA 7075-T651 base metal and welded joint. Addition of SiC was done by direct method through special holes in shoulder face. Yield Strength and tensile strength rise after processing with SiC. New tool design is introduced to this study. A hollow tool used as a reservoir for powder particles. Through holes on shoulder used as feeding holes of powder. A mechanical pressing system used to help powder inserting process. Improving mechanical properties observed was 206 HV at 1460 rpm rotating speed; 60 mm/min travels speed with particle size 3.5 µm for SiC.