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Silicon is susceptible to fatigue even under inert environment, although it has been believed not to be. This paper presents a brand-new image of the fatigue behavior of silicon obtained using the microtensile method. It is estimated that 25% of polysilicon specimens and 34% of single-crystal silicon will break in about 100 years in a nitrogen atmosphere at room temperature, when subjected to a fatigue...
In this paper, analyzing the steering knuckle of the main operating conditions, the structural analysis of ultimate working conditions is studied by use of MSC. Patran/Nastran software for the steering knuckle. Based on the ADAMS software, the multi-body dynamics analysis of the suspension structure is completed, and the bearing load under the actual working conditions is obtained. Strength analysis...
Crankshaft is one of the most important parts in internal combustion engine. In this paper, a three-dimension model of 380 diesel engine crankshaft was created through Pro/ENGINEER software. The finite element analysis (FEM) software ANSYS was used to analyze the distortion and stress status of the crankshaft. First of all, the 380 diesel engine entity crankshaft model was created by Pro/ENGINEER...
Due to their high strength to weight ratio and stiffness to weight ratio the use of honeycomb panels is particularly attractive in spacecraft structures. Honeycomb panels are often used in secondary satellite structures such as equipment platforms and solar arrays, but they can also be used as part of the primary structure of a satellite. Indeed honeycomb panel assemblies can be, and are, used to...
The main objective of this study was to explore weight reduction opportunities for a production forged steel connecting rod. This has entailed performing a detailed load analysis. Therefore, this study has dealt with two subjects, first, static load stress analysis of the connecting rod, and second, optimization for weight. In this project, finite element analysis of single cylinder four stroke petrol...
In order to increase the strength and reliability of the globoidal cam mechanism, the surface equation of the globoidal cam is deduced based on the mesh theory and differential geometry. The expression of the induced curvature of the globoidal cam are derived, the calculation model of contact stress of the globoidal cam and roller is presented, and the design and check methods of static and fatigue...
This paper deals with the thermo-mechanical properties experimental characterization of solder alloys used in power electronics packaging, and especially for TRIAC. The lead-based solder - Pb92.5Sn5.0Ag2.5 - is evaluated. The Young's modulus, the yield strength, the mechanical strength, and the elongation at break are measured from 25degC up to 150degC. Additional creep measurements are performed...
Fatigue tests of silicon stepped cantilevers fabricated from silicon on insulator (SOI) wafers were conducted under the bending mode to evaluate the effect of cyclic loading on fractures occurring in silicon and Si/SiO2 interfaces. The specimen in the quasi-static mode fractured at the stress concentration site on the silicon specimens. However, during the fatigue tests the cantilever broke after...
The effect of mechanical fatigue on structural performances of gold devices is investigated. The pull-in voltage of special testing micro-systems is monitored during the cyclical load application. The mechanical collapse is identified as a dramatic loss of mechanical strength of the specimen. The fatigue limit is estimated through the stair-case method by means of the pull-in voltage detections. Measurements...
Latest design of superconducting magnet system in JT-60SA is presented. This magnet system consists of the TF coils and PF coils (CS and EF coils). For this magnet system, stress analyses are systematically carried out to optimize the structural design. In the analysis of TF coil, it is clarified that jacket of conductor has significant strength under the designed electromagnetic (EM) load. In addition,...
In-situ neutron diffraction measurement was conducted to investigate the plastic deformation and fatigue damage behavior of ultrafine-grained high-strength Cu processed by equal channel angular pressing, ECAP. The experiments were conducted on the ultrafine-grained samples, as well as large-grained counterparts, under tensile and fatigue loading using RESA of Japan Atomic Energy Agency. The diffraction...
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