1Cr18Ni9Ti不锈钢低周疲劳随动硬化实验研究

Experimental Study on Kinematic Hardening of 1Cr18Ni9Ti Stainless Steel Under Low Cycle Fatigue

为了研究单调加载对1Cr18Ni9Ti不锈钢材料后继循环塑性硬化和流动特性的影响,对该材料进行了带平均应变的低周疲劳实验研究。对不同应变幅值的对称应变及非对称的应变循环进行了屈服面半径和背应力演化分析,揭示了材料的随动硬化和各向同性硬化演化对应变幅值和平均应变的依赖性。实验结果为建立循环加载和单调加载耦合的复杂加载条件下的本构模型提供了实验基础。

To study the effect of the monotonic loading on subsequent cyclic plastic hardening and flow properties of 1Cr18Ni9Ti steel, an experimental study of the low cycle fatigue tests with mean strains for 1Cr18Ni9Ti stainless steel was carried out. An analysis on the evolutions of the yield surface radius and the back stresses under symmetric and asymmetric cyclic strain loading with different strain amplitudes was made .The dependence of the evolutions of the material kinematic hardening and isotropic hardening on the strain amplitude and mean strain was observed, These results provide the experimental foundation for the constitutive model of the material under combined monotonic and cyclic complicated loads.