Abrassive wear is a complex mechanical process with specific characteristics, dependent on the bo... more Abrassive wear is a complex mechanical process with specific characteristics, dependent on the bodies velocities and load, the quality of contact surfaces, the mechanical properties of the superficial layers, lubrication etc. During the friction of the bodies in contact, the mechanical properties and the micro-topography of superficial layers change, most of the time irrecoverable, leading to the shut-down of the technical system they are part of. The present paper proposes a theoretical and experimental analysis of the abrassive wear behaviour of a coupling made of steel/cast iron as well as the detection of the wear trace dependent on the inclination angle of the harder material asperities (penetrator).
Long steel products type 16CD4 used in car industry must meet high quality conditions regarding c... more Long steel products type 16CD4 used in car industry must meet high quality conditions regarding chemical composition, surface quality, macro-structural, microstructural and mechanical characteristics. The paper presents the correlations between mechanical characteristics and the main alloying elements of 16CD4 steel; this will give varying characteristics Rm, A5 and KCU, in correlation with the various proportions of chrome, molybdenum and carbon contained by steel. This steel brand is part of the chosen alloy steels, presenting plastic deformation resistance in conditions of high temperature. See that it is not necessary maximum carbon content for the mechanical characteristics have maximum values. The material studied was 16CD4 steel (17MoCr11), developed in EBT and treated steel to LF. Mechanical properties dependent of the content of carbon, chromium and molybdenum have been analyzed in this paper, using a mathematical model. Model verification was conducted by test Fischer and the results indicate that there are strong correlations between the mechanical properties and the percentage of carbon, chromium and molybdenum.
This paper presents experimental results revealed on the samples type 2024 aluminum alloy used in... more This paper presents experimental results revealed on the samples type 2024 aluminum alloy used in aeronautics. Adequate characterization of 2024 aluminum alloys with special destination (aviation) was achieved by combined investigations:(i) wet chemical analysis, (ii) spectrochemical analysis, (iii) X-ray diffraction and (iv) electron microscopy. The main conclusion that emerges from the investigations carried out on aluminum samples revealed that: (a) alloys fits in terms of composition with the standard specification for 2024, in all cases; (b) microstructure vary in fineness of grain, but meets the requirements of aviation rules; the investigated microstructures have been appreciated as adequate of aluminum alloys type "2024".
Abrasion wear is a mechanical process when the surfaces of a friction coupling decay and which oc... more Abrasion wear is a mechanical process when the surfaces of a friction coupling decay and which occurs with material removal from the softer surfaces that get into contact with the asperities of the harder surface located in the space between the coupling elements. The paper aims to determine the wear trace remained on a softer surface following the slidding of a harder one, for a brass/iron coupling. The lubrication of coupling and the processing way of the coupling surfaces are factors that directly influence the tribological behaviour of the friction coupling.
DOAJ (DOAJ: Directory of Open Access Journals), 2010
Abstract The intersections of the cylindrical surfaces with a torus are often met in practice, fo... more Abstract The intersections of the cylindrical surfaces with a torus are often met in practice, for instance in the pneumatic transport installations for the intermediate products resulted from grist. The descriptive geometry is the foundation of the engineering sciences, giving force ...
Abrassive wear is a complex mechanical process with specific characteristics, dependent on the bo... more Abrassive wear is a complex mechanical process with specific characteristics, dependent on the bodies velocities and load, the quality of contact surfaces, the mechanical properties of the superficial layers, lubrication etc. During the friction of the bodies in contact, the mechanical properties and the micro-topography of superficial layers change, most of the time irrecoverable, leading to the shut-down of the technical system they are part of. The present paper proposes a theoretical and experimental analysis of the abrassive wear behaviour of a coupling made of steel/cast iron as well as the detection of the wear trace dependent on the inclination angle of the harder material asperities (penetrator).
Long steel products type 16CD4 used in car industry must meet high quality conditions regarding c... more Long steel products type 16CD4 used in car industry must meet high quality conditions regarding chemical composition, surface quality, macro-structural, microstructural and mechanical characteristics. The paper presents the correlations between mechanical characteristics and the main alloying elements of 16CD4 steel; this will give varying characteristics Rm, A5 and KCU, in correlation with the various proportions of chrome, molybdenum and carbon contained by steel. This steel brand is part of the chosen alloy steels, presenting plastic deformation resistance in conditions of high temperature. See that it is not necessary maximum carbon content for the mechanical characteristics have maximum values. The material studied was 16CD4 steel (17MoCr11), developed in EBT and treated steel to LF. Mechanical properties dependent of the content of carbon, chromium and molybdenum have been analyzed in this paper, using a mathematical model. Model verification was conducted by test Fischer and the results indicate that there are strong correlations between the mechanical properties and the percentage of carbon, chromium and molybdenum.
This paper presents experimental results revealed on the samples type 2024 aluminum alloy used in... more This paper presents experimental results revealed on the samples type 2024 aluminum alloy used in aeronautics. Adequate characterization of 2024 aluminum alloys with special destination (aviation) was achieved by combined investigations:(i) wet chemical analysis, (ii) spectrochemical analysis, (iii) X-ray diffraction and (iv) electron microscopy. The main conclusion that emerges from the investigations carried out on aluminum samples revealed that: (a) alloys fits in terms of composition with the standard specification for 2024, in all cases; (b) microstructure vary in fineness of grain, but meets the requirements of aviation rules; the investigated microstructures have been appreciated as adequate of aluminum alloys type "2024".
Abrasion wear is a mechanical process when the surfaces of a friction coupling decay and which oc... more Abrasion wear is a mechanical process when the surfaces of a friction coupling decay and which occurs with material removal from the softer surfaces that get into contact with the asperities of the harder surface located in the space between the coupling elements. The paper aims to determine the wear trace remained on a softer surface following the slidding of a harder one, for a brass/iron coupling. The lubrication of coupling and the processing way of the coupling surfaces are factors that directly influence the tribological behaviour of the friction coupling.
DOAJ (DOAJ: Directory of Open Access Journals), 2010
Abstract The intersections of the cylindrical surfaces with a torus are often met in practice, fo... more Abstract The intersections of the cylindrical surfaces with a torus are often met in practice, for instance in the pneumatic transport installations for the intermediate products resulted from grist. The descriptive geometry is the foundation of the engineering sciences, giving force ...
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