摘要
用晶体相场模型模拟扰动应变下纳米微裂纹的扩展行为,探讨扰动频率及温度对微裂纹扩展行为及稳定性的影响。结果表明:温度提升在扰动频率较小时能引起脆韧转变,裂纹稳定性因温度升高而下降。扰动频率的提升在温度低于脆韧转变温度时,能在演化初期引起脆韧转变,之后将抑制脆性扩展,但无法引起韧脆转变;当温度高于脆韧转变温度时,扰动频率不再改变裂纹扩展模式。裂纹稳定性随扰动频率的增大先下降后上升。
A phase⁃field⁃crystal model is used to simulate microcrack growth under disturbance strain.Influences of disturbance frequency and temperature on growth behavior and stability of microcrack are discussed.It shows that:①Fracture mode is affected by temperature of the system under certain conditions.②Influence of disturbance frequency on crack propagation behavior is affected by temperature of the system.③Stability of crack decreases firstly and then increases with the increase of disturbance frequency.The increase of temperature leads to the decrease of crack stability.
作者
李建伟
项璇
王景栋
胡石
陈铮
贺元骅
LI Jianwei;XIANG Xuan;WANG Jingdong;HU Shi;CHEN Zheng;HE Yuanhua(Civil Aircraft Fire Science and Safety Engineering Key Laboratory of Sichuan Province,Civil Aviation Flight University of China,Guanghan,Sichuan 618307,China;State Key Laboratory of Solidification Processing,Northwestern Poly Technical University,Xi’an,Shaanxi 710072,China)
出处
《计算物理》
CSCD
北大核心
2022年第6期717-726,共10页
Chinese Journal of Computational Physics
基金
国家重点研发计划(2018YFC0809500)
国家自然科学基金(U2033206)
四川省科技计划(2021YFSY0001)
四川省科技创新苗子工程(2021125)资助项目
关键词
晶体相场
扰动应变
温度
微裂纹
phase⁃field⁃crystal
disturbance strain
temperature
microcrack
作者简介
第一作者:李建伟(1995-),男,硕士生,主要从事计算物理研究,E⁃mail:lijianwei5566@126.com;通信作者:贺元骅(1965-),男,汉族,硕士,教授,主要研究方向为金属材料,E⁃mail:heyuanhua@cafuc.edu.cn
