摘要
缺口会导致严重的应力集中,并降低结构的使用寿命,研究缺口部位的低周疲劳寿命具有重要意义。基于弹塑性全量理论建立30CrMnSiA材料的弹塑性本构关系,采用损伤力学-有限元法预测30CrMnSiA材料缺口试样的低周疲劳寿命,并与相应的试验结果进行对比。结果表明:基于弹塑性全量理论建立的弹塑性本构关系方法合理,采用损伤力学方法得到的疲劳寿命预测结果基本满足工程实际要求,该方法可用来对30CrMnSiA缺口试样进行低周疲劳寿命预测。
Notches can lead to serious stress concentration and reduce the service life of structures.Therefore,it is of great significance to study the low cycle fatigue life of notches.The elastic-plastic constitutive function of 30CrMnSiA steel is presented based on the total theory of plasticity,and the low cycle fatigue life of 30CrMnSiA notched specimens is predicted by damage mechanics and finite element method.The results are compared with the corresponding experimental results.The results show that the elastic-plastic constitutive relation method based on the total elastic-plastic theory is reasonable,and the fatigue life prediction results basically meet the engineering requirements.The low cycle fatigue life prediction of 30CrMnSiA notched specimens can be carried out based on the damage mechanics method.
作者
谢伟
周慕莹
齐紫玉
Xie Wei;Zhou Muying;Qi Ziyu(School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072,China)
出处
《航空工程进展》
CSCD
2019年第4期542-549,共8页
Advances in Aeronautical Science and Engineering
基金
陕西省自然科学基金(2017JM1027)
中国航天科技集团公司航天科技创新基金
