GLOBAL JOURNAL OF ENGINEERING SCIENCE AND RESEARCHES MEASUREMENT OF RESIDUAL STRESS DISTRIBUTION AND FATIGUE LIFE ASSESSMENT OF SIMILAR AND DISSIMILAR BUTT WELDED JOINT

Sree, Harish, M N, Ashik, Prajwal, Research Assistant, Bangalore, Hassan Student
unpublished
The welding process induces residual tensile stress that is detrimental to fatigue life. Tensile stresses act to stretch or pull apart the surface of the material. With enough load cycles at a high enough tensile stress, a crack is initiated. Significant improvement in fatigue life can be obtained by modifying the residual stress level in the material. The intent of this work is to measure the residual stress distribution and fatigue life assessment of butt welded joint with similar (M.S and
more » ... similar (M.S and M.S) and dissimilar (SS304L and M.S IS 2062) materials. The residual stress level in these joints is evaluated accurately by X-ray diffraction, before and after the surface modification. The surface modification method employed is shot peening, which is simple and yet effective to improve the fatigue life of the joint. In this study an experiment was carried out into the effect of shot peening upon improvement in the fatigue strength, which validates the FEA static structural analysis carried out for the joint.
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