The main purpose of the building envelope is to protect us from the surrounding climate; the building envelope is not only a shelter but also an active component in the system of the building, which can also defined as an environmental... more
The main purpose of the building envelope is to protect us from the surrounding climate; the building envelope is not only a shelter but also an active component in the system of the building, which can also defined as an environmental filter. The development in building technology; building design is becoming an increasingly complex task, due to a growing demand to satisfy environmental performance requirements and reducing the energy consumption of buildings. Material improvements present an opportunity to rethink architecture as part of its environment. The new design approach integrating parametric design and biomimicry for energy efficiency and interactive building expression. In general, all materials change with changing temperature and moisture content, some more and some less; overall, their reaction to the temperature changes, depending on material properties. The present research is to establish the possibilities of adaptive materials used as building envelopes, which could be the solution to the over-heating problems and cool spaces without increasing the use of energy consuming. This phenomenon is inspired from the flower heads that open and close to acclimate to the environmental conditions in accordance with their needs and by means of their integrate thermo nastic material (biomimicry in architecture). The Results obtained using Timoshenko formula, for calculating the radius of curvature of a bimetallic strip, by means of parametric modeling (grasshopper). Revealed that biomimetic design approach is of great support to the sustainable design and contribute to the possibilities of reducing energy use through application of thermal behavior in bimetallic strip material as autonomous adaptive envelope solutions.
Welding is a widely used process in industry because welding techniques have some striking features which are included in this project. In other way of saying, welding techniques will be so important in human life in the future because of... more
Welding is a widely used process in industry because welding techniques have some striking features which are included in this project. In other way of saying, welding techniques will be so important in human life in the future because of their unique specialties. For this reason, researches and studies on welding are increasing day by day. Welding is used in different areas in industry and it has various features. Welding is especially used in the manifacturing area, as a connector between materials in the existence of heat and pressure (with or without additional materials). The main targets in this process are; lowest cost, highest satisfaction in performance and longest life. In this project, the importance of choosing a suitable production regarding to the intended features and how to improve the mechanical features, tried to be explained. Therefore, the welding process which is going to be applied to the materials which has different metal content, are virtually modelled by using Ansys Workbench software. Parameters as, used materials and chosen welding techniques within this project are widely explained. Experimental studies were done in order to help the project to enlighten the future studies and to make the project based on numerical data (simplifies prooving). In the other parts of the experimental studies, welding process is applied to the materials which have different metal contents by using Ansys Workbench software. Modelling a material using different welding techniques before production gives more practical and more proactive vision.
In the present experimental study, bimetal aluminium/magnesium macro composites which contain magnesium core were fabricated via compound casting by lost foam casting process. AM50 Mg alloy prismatic core was placed into a cubic EPS foam... more
In the present experimental study, bimetal aluminium/magnesium macro composites which contain magnesium core were fabricated via compound casting by lost foam casting process. AM50 Mg alloy prismatic core was placed into a cubic EPS foam pattern. Conventional process steps of lost foam casting were followed and A319 casting aluminium alloy was melted and poured. Experimental studies have shown that determination of casting temperature is very important to avoid melting of Mg alloy core. Microstructures of sectioned cast specimens were observed by light microscope and scanning electron microscope (SEM). Energy dispersive X-ray spectroscopy (EDS) analysis and Brinell hardness tests were carried out. Especially, transition zone and Al/Mg interface were in the focus of research.
Numbers of both ferrous and non-ferrous bimetal productions and applications have been increased due to useful advantages. Bimetal fabrication techniques and procedures are developing and getting various. Liquid metal based techniques are... more
Numbers of both ferrous and non-ferrous bimetal productions and applications have been increased due to useful advantages. Bimetal fabrication techniques and procedures are developing and getting various. Liquid metal based techniques are in basic bimetal fabrication methods which have two types; liquid-solid and liquid-liquid processes. Lost foam casting technique can be successfully employed for both liquid-solid and liquid-liquid bimetal composite productions. In this work, A380 and A2014 aluminium alloys were used to produce bimetal structure by conventional lost foam casting with liquid-liquid process. There are two main principles of liquid-liquid process. First, both alloys are joined in liquid phase and solidified and second, crucibles tilting are carried out synchronously at the same time. HB hardness of the cast specimens were measured and micro structure of the joint field were observed.
Bimetallic shallow shells are thermal sensors. The paper presents relevant technical information on bimetallic shallow shells and describes some interesting physical experiments. It is shown how, through simple measurements and... more
Bimetallic shallow shells are thermal sensors. The paper presents relevant technical information on bimetallic shallow shells and describes some interesting physical experiments. It is shown how, through simple measurements and calculations, it is possible to determine the initial speed (~3.5 m/s), the acceleration (~30000 m/s²) and the lower and upper snap temperature (~22 °C; ~32 °C) of the bimetal. The results from calculations are comparable to those obtained by a high speed camera. The videos give an even deeper insight into the phenomenon of the snap-through.
Production and applications of both ferrous and non-ferrous bimetals have been increased due to several advantages and the respective fabrication techniques and procedures are rapidly developing. Liquid metal based fabrication techniques... more
Production and applications of both ferrous and non-ferrous bimetals have been increased due to several advantages and the respective fabrication techniques and procedures are rapidly developing. Liquid metal based fabrication techniques of bimetal production can be classified in two types, i. e., liquid-solid and liquid-liquid processes. Lost foam casting technique can be successfully employed for both liquid-solid and liquid-liquid bimetal composite productions. In this study, A380 and A6063 aluminum alloys were used to produce a bimetallic structure by conventional lost foam casting with the liquid-liquid process. There are two main principles of the liquid-liquid process. Firstly, both alloys are joined in liquid phase and solidified. Secondly, crucible tilting of he metals is carried out synchronously at the same time. The Brinell hardness of the cast specimens was measured and the microstructures of the joint were investigated by light microscope and SEM. Additionally, EDX mapping analysis of the bonding zone was carried out.
One of the requirements of architectural buildings is to reduce the negative effect it has in the surrounding environment. In designing programs has been successfully applied the concept of biological facades. Interpreting the... more
One of the requirements of architectural buildings is to reduce the negative effect it has in the surrounding environment. In designing programs has been successfully applied the concept of biological facades. Interpreting the architectural façade in an analogy with the biological organism 's skins, it has been represented a multiple-choice catalogue with different functions which are half full filled by technological facades in architecture. Such a situation allows and leads to promising and innovative concepts. Biological organisms have different strategies to adapt with internal and external changes. The skin and the outer shell of these organisms plays an important role in disconnection and connection of the structures that are used to protect them, to adapt to temperature, lightning, humidity etc. The focus of this research paper is to make an analogy between intelligent biological skins and technological skins. According to the analysis of different adaptive skins, in this research we have proposed an adaptive façade system in the Faculty of Architecture and Urbanism in Tirana that reacts towards climate. This system will provide better condition with optimal comfort parameters for different activities that might take place there using, by reducing the energy consumption.
ABSTRACT Production and applications of both ferrous and non-ferrous bimetals have been increased due to several advantages and the respective fabrication techniques and procedures are rapidly developing. Liquid metal based fabrication... more
ABSTRACT Production and applications of both ferrous and non-ferrous bimetals have been increased due to several advantages and the respective fabrication techniques and procedures are rapidly developing. Liquid metal based fabrication techniques of bimetal production can be classified in two types, i. e., liquid-solid and liquid-liquid processes. Lost foam casting technique can be successfully employed for both liquid-solid and liquid-liquid bimetal composite productions. In this study, A380 and A6063 aluminum alloys were used to produce a bimetallic structure by conventional lost foam casting with the liquid-liquid process. There are two main principles of the liquid-liquid process. Firstly, both alloys are joined in liquid phase and solidified. Secondly, crucible tilting of he metals is carried out synchronously at the same time. The Brinell hardness of the cast specimens was measured and the microstructures of the joint were investigated by light microscope and SEM. Additionally, EDX mapping analysis of the bonding zone was carried out.
The paper deals with the buckling and mechanical conditions in the thin shallow double layered shell with star shape opening on top of the shell. According to the theory of third order, which takes into account the equilibrium state of... more
The paper deals with the buckling and mechanical conditions in the thin shallow double layered shell with star shape opening on top of the shell. According to the theory of third order, which takes into account the equilibrium state of forces and moments which are acting on the deformed system, the thesis is presenting a model with mathematical description of the geometry of the system, stresses, thermo elastic strains and displacements. As an example, the results of spherical shallow shells are analysed with finite element method. Besides simply-roller supported shells, also simply bearing-supported and clamped shells are discussed. The shells are loaded with temperature and/or with concentrated acting load at the top of it.
