High-Cycle Fatigue Behavior of Austenitic Steel and Pure Copper under Uniaxial, Proportional and Non-Proportional Loading

Austenitic steel EN: X2CrNiMo17-12-2 (ASTM: 316L) and copper Cu-ETP (DIN: E-Cu58, EN: CW004A, ASTM: C11000) were subject to tension-compression, torsion and complex loads, including non-proportional loads. Non-proportionality of state of stress resulted from phase shift of value δ = 90° of load components with sine signals and variable ratio of shear to normal stress λ. On the basis of the results Wohler’s curves were prepared presenting dependency of fatigue life to equivalent stress level. Their analysis shows that fatigue life is strictly connected with the value of coefficient λ. Existence of its critical value can also be noticed, which results in the highest fatigue life reduction. The value is different for each material. Also factographic tests were conducted showing the influence of level and type of load on fracture face.

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