摘要
作为细观尺度上描述各向异性非均质材料塑性变形行为的重要方法,晶体塑性模型能够基于晶体材料的微观组织结构预测其宏观力学性能,在航空航天金属的力学性能设计及评估中展现出应用前景。本文总结了晶体塑性模型的发展历程和不同变种,从流动准则、硬化模型和内部状态变量演化3个角度对比分析了唯象晶体塑性模型与基于物理机制的晶体塑性模型的特点与差异;然后介绍了基于疲劳指示参数和寿命评估准则的晶体塑性有限元在金属疲劳寿命预测领域的应用尝试,以航空航天常用金属疲劳裂纹萌生寿命预测为例,给出了部分应用实例表明不同模型的预测能力和适用性;最后展望了晶体塑性模型和应用的未来发展趋势和有待加强的研究方向。
As an important methodology to describe plastic deformation behavior of anisotropic heterogeneous materials at the mesoscale,the crystal plasticity(CP)model can predict the macroscopic mechanical properties of crystal materials based on their microstructures,and play a part in the development of new alloys for aerospace applications.The development history of various CP models is summarized.In particular,the similarities and differences between the phenomenological CP model and the physically based CP model are compared and analyzed in terms of flow rules,hardening model,and internal state variable evolution.Then,the practical application of CP finite element method(CPFEM)for the prediction of metal fatigue life is introduced.This method relies on the fatigue indicator parameters and life evaluation criteria.Typical efforts for predicting the fatigue crack initiation life of aerospace metals by CPFEM are overviewed to demonstrate the predictive ability and appropriateness of various models.Finally,an outlook on the future development tendency of CP model and its applications,as well as the related research directions which need to be strengthened,is provided.
作者
易敏
胡文轩
YI Min;HU Wenxuan(State Key Laboratory of Mechanics and Control of Aerospace Structures,Nanjing University of Aeronautics&Astronautics,Nanjing 210016,China)
出处
《南京航空航天大学学报》
CAS
CSCD
北大核心
2023年第1期12-27,共16页
Journal of Nanjing University of Aeronautics & Astronautics
关键词
晶体塑性模型
疲劳寿命
航空航天
本构模型
裂纹萌生
crystal plasticity model
fatigue life
aerospace
constitutive model
crack initiation
