Abstract
This paper provides experimental and analytical evaluation of durability of nonhardened and hardened by EMT specimens of grade 45 steel with stress concentrators, under low cycle tension-compression and pure bending. For both types of loading modes durability analysis was carried out, taking into account fatigue and quasi-static damage depending on loading level and the number of semicycles. Stress and strain concentration coefficients were calculated by analytical and finite element methods (FEM) under elastic plastic cyclic loading. It was determined, that in specimens with the stress concentrators under low cycle pure bending, hardened surface has nonsignificant influence on the durability, while under low cycle tension-compression the positive influence starts when stress amplitude is max 1.3 σ ≤ . The performed analyticalinvestigation showed, that the suggested method for quasistatic and fatigue damage summation, when accumulated plastic strain and the width of hysteresis loop are taken into account, provides a very good agreement with the experimental results in stress concentration zones of surfacehardened parts under tension-compression and bending.
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