晶体塑性疲劳指示因子研究方法综述  

Research Progress of Crystal Plastic Fatigue Indicator Parameters

作　　者：郑战光[1] 覃里杜 谢昌吉 潘淑琴[2] 孙腾 ZHENG Zhanguang;QIN Lidu;XIE Changji;PAN Shuqin;SUN Teng(College of Mechanical Engineering,Guangxi University,Nanning 530004;Library of Guangxi University,Nanning 530004;College of Mechanical Engineering&Ocean Engineering,Beibu Gulf University,Qinzhou 535011)

机构地区：[1]广西大学机械工程学院,南宁530004 [2]广西大学图书馆,南宁530004 [3]北部湾大学机械与船舶海洋工程学院,钦州535011

出　　处：《机械工程学报》2022年第8期105-116,共12页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(51675110,11962001)。

摘　　要：金属材料与结构的疲劳失效被视为工程领域的“癌症”,是微观结构逐渐劣化的结果,因此从微观角度准确预测材料与结构的疲劳裂纹萌生就显得极为必要与迫切。基于晶体塑性有限元的疲劳指示因子(Fatigue indicator parameters, FIP)能从微观角度较好地表征剪应变主导的疲劳裂纹驱动力,目前已经形成了累积塑性滑移类、应变能耗散类与多轴疲劳寿命预测准则改进的FIP等。累积塑性滑移类FIP是基于位错滑移与应力集中理论所建立,多个应用案例也表明能较好地描述疲劳驻留滑移带与三叉晶界应力集中等现象,具有形式简单、参数少等优点;应变能耗散类FIP是基于能量理论,不区分载荷模式与裂纹扩展优先方向,在高应变幅或复杂载荷状况下较累积塑性滑移类FIP更可靠;多轴疲劳寿命预测准则改进的FIP主要有基于Fatemi-Socie准则、Dang Van准则与Tanaka-Mura准则等修正的FIP,虽工程应用广泛,但是由于经验模型需要大量试验确定参数且临界平面与位错滑移平面的关系不明。为此,指出研究多轴疲劳损伤的临界平面与晶体塑性的滑移平面的物理一致性、以晶粒旋转数据直接构建晶体塑性FIP模型以及采用模糊数学分析晶体塑性FIP的特性是未来的发展方向,它们对于补充与完善晶体塑性FIP方法具有重要的理论意义与实用价值。Fatigue failure of metal materials and structures is considered as a “cancer” in engineering field and the result of gradual deterioration of microstructure.Therefore,quantifying this behavior is crucial in predicting fatigue crack initiation.Fatigue indicator factor(FIP) based on crystal plastic finite element can better characterize fatigue crack driving force dominated by shear strain from a micro perspective.At present,FIP models such as cumulative plastic slip,strain energy dissipation and fatigue indicator factor improved by multi-axial fatigue life prediction criteria have been proposed.The first one within the framework of dislocation slip theory demonstrated the success of the model in describing the phenomenon of fatigue persistent slip band and stress concentration at the trigeminal grain boundary with a relatively simple formulation and few materials parameters.The second approach is based on energy theory without distinguishing the load mode and the preferred direction of crack growth.It is more reliable than cumulative plastic slip under high strain amplitude or complex loading conditions.The last one improved by Fatemi-Socie criterion,Dang-Van criterion,as well as Tanaka-Mura criterion has been widely used in engineering,but a large number of experimental parameters are needed for empirical model.In fact,the relationship between critical plane and dislocation slip plane is not clear enough.As the above summaries,it is pointed out that the research on the physical consistency between the critical plane of multiaxial fatigue damage and the slip plane of crystal plasticity,the direct construction of crystal plasticity FIP model based on grain rotation data,and the analysis of the characteristics of crystal plasticity FIP by fuzzy mathematics are the future development directions,which have important theoretical significance and practical value for the supplement and improvement of crystal plasticity FIP method.

关 键 词：晶体塑性 疲劳指示因子 裂纹萌生 疲劳寿命预测 

分 类 号：TG117[金属学及工艺—物理冶金]