摘要
工件在加工过程中出现的微裂痕会使结构内部出现裂纹、断口等不可逆伤害。利用有限元软件ABAQUS围道积分裂纹扩展法和自编Python程序实现网格重划分和裂纹任意路径扩展,模拟实现微动往复运动下多裂纹的任意路径扩展,施加不同往复位移幅值和不同下压深度,对应力强度因子K1、K2值和裂纹最终扩展轮廓进行对比研究。在分析多裂纹扩展图像中,发现不同位移幅值对裂纹扩展不会因裂纹条数增加产生明显变化;不同下压深度对裂纹扩展轮廓影响较大;裂纹之间的应力场相互作用,对裂纹各项参数造成影响。此外,裂纹扩展发生交叉时,裂纹会立即停止扩展。
The micro-cracks in the workpiece during processing will cause irreversible damage such as cracks and fractures in the structure.Using the finite element software ABAQUS confinement integral crack growth method and self-compiled Python program to realize the re-meshing and the arbitrary path expansion of cracks,simulate the arbitrary path expansion of multiple cracks under the fretting reciprocating motion,and apply different moving amplitudes and different down Depth of compression,the stress intensity factors K1,K2 values and the final crack propagation profile are compared.In the analysis of the multi-crack growth image,it is proposed that different displacement amplitudes will not significantly change the crack growth due to the increase in the number of cracks;different depression depths have a greater impact on the crack growth profile;the stress field interaction between the cracks will affect the crack.Various parameters have an impact.In addition,when the crack propagation crosses,the crack will stop growing immediately.
作者
赵一舟
李俨
土旗
唐正强
ZHAO Yi-zhou;LI Yan;TU Qi;TANG Zheng-qiang(School of Mechanical Engineering,Guizhou University,Guiyang 550025,China)
出处
《组合机床与自动化加工技术》
北大核心
2021年第8期138-142,共5页
Modular Machine Tool & Automatic Manufacturing Technique
基金
贵州省科技计划项目([2016]1035)
贵州省科技计划项目([2017]7245)
贵州省科技创新人才团队项目([2020]5020)。
关键词
微动工况
裂纹扩展
往复位移
下压深度
应力强度
fretting condition
crack propagation
reciprocating displacement
pressure depth
stress intensity
