Research on Multiaxial Low Cycle Fatigue Life Model Based on a New Non-proportional Factor
The non-proportional additional hardening effect has a significant impact on the multiaxial low-cycle fatigue life,where the non-proportionality caused by the loading path and the non-proportional characteristics of the material itself are the key factors.This article considers the non-proportionality caused by the phase angle and strain ratio and proposes a simpler and more intuitive new path of nonproportionality.The static hardening parameter of the material is introduced to replace the non-proportional additional hardening coefficients,which not only avoids complex experimental processes and errors introduced by data fitting but also reflects the non-proportional characteristics of the material itself without obvious additional hardening.A new non-proportional factor was proposed by combining the influence of path factors and material factors.Then a multiaxial low-cycle fatigue life prediction model was established using the critical plane method,and the multiaxial low-cycle fatigue life of 13 materials(including 6 materials without obvious additional hardening)was predicted.By comparing with experimental data,it is shown that this prediction model has high accuracy and material applicability.
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