Study On The Non-Proportional Cyclic Plasticity

In the last two decades, lots of experimental and theoretic research on the hardening behavior and flow characteristics of metallic materials under nonproportional cyclic loading, and ratcheting for metallic materials has been done. The cyclic constitutive models have advanced significantly. However, how to describe uniformly the non-proportionally multiaxial ratcheting and strain-controlled cyclic behavior is still a challenge. We should do more deep and comprehensive research on the non-proportionally multiaxial ratcheting and the relatively strain-controlled cyclic behavior, and then develop a constitutive model which can simulate them more accurately. This research is then a topic with theoretical significance for solid mechanics and other interrelated subject and application value for designing and using engineering components credibly.In order to carry out an in-depth research on the non-proportionally multiaxial ratcheting and strain-controlled cyclic behavior for cyclic hardening material and develop a constitutive model which can simulate them more accurately, this thesis is mainly concerned with the following studies:Based on the Valanis'endochronic constitutive theory, a new...