Hatami Faezeh, Varvani-Farahani Ahmad
Department of Mechanical and Industrial Engineering, Toronto Metropolitan University, Toronto, ON M5B 2K3, Canada.
Materials (Basel). 2023 Mar 7;16(6):2153. doi: 10.3390/ma16062153.
The present study evaluates the ratcheting response at notch roots of 1045 steel specimens experiencing uniaxial asymmetric fatigue cycles. Local stress and strain components at the notch root were analytically evaluated through the use of Neuber, Glinka, and Hoffman-Seeger (H-S) rules coupled with the Ahmadzadeh-Varvani (A-V) kinematic hardening model. Backstress promotion through coupled kinematic hardening model with the Hoffman-Seeger, Neuber, and Glinka rules was studied. Relaxation in local stresses on the notched samples as hysteresis loops moved forward with plastic strain accumulation during asymmetric loading cycles was observed. Local ratcheting results were simulated through FE analysis, where the Chaboche model was employed as the materials hardening rule. A consistent response of the ratcheting values was evidenced as predicted, and simulated results were compared with the measured ratcheting data.
本研究评估了经历单轴非对称疲劳循环的1045钢试样缺口根部的棘轮响应。通过使用Neuber、Glinka和Hoffman-Seeger（H-S）规则以及Ahmadzadeh-Varvani（A-V）运动硬化模型，对缺口根部的局部应力和应变分量进行了分析评估。研究了通过耦合运动硬化模型与Hoffman-Seeger、Neuber和Glinka规则产生的背应力促进作用。观察到在非对称加载循环期间，随着滞回环随着塑性应变积累向前移动，缺口试样上局部应力的松弛情况。通过有限元分析模拟了局部棘轮结果，其中采用Chaboche模型作为材料硬化规则。如预测的那样，棘轮值呈现出一致的响应，并将模拟结果与测量的棘轮数据进行了比较。
