This paper aims to study the properties of 300µm thickness 304 stainless steel. This research topic was selected considering the high demand for the production of small products such as smart phones, solar systems, hard drives, etc. Stainless steel was chosen for its low cost, suitable weight, and good mechanical properties in terms of strength and deformation compared to other materials. However, specimen size and strain may affect the results achieved. In this study, the effects of 2% and 5% strains on the fatigue strength of very thin 304 stainless steel sheets were investigated. Fatigue samples were cut into dumbbell-shapes with a rectangular cross-section as per ASTM E8. The tensile testing results showed that 300µm thickness heat-treated specimen sheets had less strain hardening with clear evidence of yielding. The fatigue test showed that higher strain values lengthened the fatigue life cycles of the stainless steel specimens. From this study, it can be concluded that tensile strain can improve the fatigue strength of very thin 304 stainless steel sheets.
This paper discusses the effect of different loading analysis on crack initiation life of wheel/rail in the contact region. A simulated three dimensional (3D) elastoplastic model of a wheel/rail contact is modelled using the fine mesh technique in the contact region by using Finite Element Method FEM code ANSYS 11.0 software. Different loads of approximately 70, 80, 90, 100, 110, 120, 130 and 140 KN were applied to the wheel tread during the running surface of the railhead to simulate stress distribution (Von Mises) and a life prediction of the crack initiation. Stress analysis is performed and the fatigue damage to the railhead surface is calculated numerically by using a multi-axial fatigue life of crack initiation model. Results obtained from previous researches are compared with this research.
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