A weight function-critical plane approach for low-cycle fatigue under variable amplitude multiaxial loading |
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| Authors: | X CHEN D JIN K S KIM |
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| Affiliation: | School of Chemical Engineering &Technology, Tianjin University, Tianjin, 300072, P. R. China;, School of Mechanical Engineering, Shenyang Institute of Chemical Technology;, Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang 790-784, South Korea |
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| Abstract: | Low‐cycle fatigue data of type 304 stainless steel obtained under axial‐torsional loading of variable amplitudes are analyzed using four multiaxial fatigue parameters: SWT, KBM, FS and LKN. Rainflow cycle counting and Morrow's plastic work interaction rule are used to calculate fatigue damage. The performance of a fatigue model is dependent on the fatigue parameter, the critical plane and the damage accumulation rule employed in the model. The conservatism and non‐conservatism of predicted lives are examined for some combinations of these variables. A new critical plane called the weight function‐critical plane is introduced for variable amplitude loading. This approach is found to improve the KBM‐based life predictions. |
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| Keywords: | damage accumulation rule irregular loading multiaxial fatigue rainflow cycle counting weight function-critical plane approach |
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