Papers by Keyword: Local Stress-Strain Method

Abstract: The principle of fatigue life computation was presented on the basis of local stress-strain method. It was set up that the finite element model of stepped shaft with different radii of round corner and radius ratios. The local stress and strain were computed at shaft shoulder fillet under torsion load. The fatigue crack initiation life was determined by means of local stress-strain method under symmetric cyclic torsion load. The result showed that the fatigue life increased with the values of fillet increase and decreased with the values of radius ratio increase, and the smaller of the transition radius was, the shorter of the life would be.

Abstract: The three-dimensional finite element model of cabin glass with surface scratch is built using the finite element software ANSYS, which is aimed to analyze the detailed stress around the scratch route tip. Then the fatigue notch factor can be gained through utilizing of results from three-dimensional model, which is followed by the estimation of fatigue life based on local stress-strain method. It is found that the stress around scratch route tip is nearly linearly increased with the increasing of tip depth (0.2mm<h<0.8mm) and the fatigue performances of cabin glass with surface scratch are sensitive to scratch depth. Finally, fatigue tests are carried out with the specimens of different scratch route tip depths, and validation against fatigue life by local stress-strain method and experimental data shows a good agreement, which indicates that the scratch model and the local stress-strain method for the effects of scratch on cabin glass fatigue performances are valid.

Abstract: Based on the theory of fatigue life prediction and by using the local stress-strain method and the material S-N curve of Q235 deduced by empirical formula; the fatigue was analyzed for the key parts of large-scale liner vibration screener by means of the general finite element analysis software, ANSYS. Thereby, the working conditions of force bearing, reliability and fatigue life-span of the key parts can be judged. The study will provide a theoretical basis for the design , manufacture, and installation of the large-scale liner vibration screener.