摘要
针对冷镦钢紧固件在动态载荷下由裂纹萌生与扩展引起的断裂失效行为,分别采用Newmark隐式与中心差分显式算法,通过施加边界条件,以非线性有限元动态分析技术建立冷镦钢试样拉伸模型,结合准静态拉伸实验,研究Newmark法与中心差分法在冷镦钢动态加载过程中裂纹扩展模拟的不同,获得了两种算法下冷镦钢裂纹扩展特征。最后将研究结果应用到某汽车座椅滑轨紧固件动态斜拉破坏实验分析中。经仿真分析和试验验证,中心差分显式算法具有良好的裂纹扩展模拟效果,能够较为真实地模拟裂纹扩展实际情况,对实际工程应用具有参考意义。
For the fracture behavior caused by the crack initiation and propagation in cold heading fasteners under dynamic loading,with the Newmark implicit and the central difference explicit algorithm and by the boundary conditions,a finite element tension model of cold heading steel is established based on nonlinear finite element dynamic analysis technologies.With the experimental dynamic tension test,the difference between the Newmark implicit and the central difference explicit algorithm in simulating crack propagation under the loading process of cold heading steel is analyzed.The characteristics of crack propagation through the use of above two different algorithms are obtained,and the application of the research achievement was conducted by the analysis of the dynamic diagonal tension failure test for the fastener of automobile seat slide.The results from simulation and experiment show that the use of the central difference explicit algorithm in simulating crack propagation is more accurate by comparison with that of the Newmark implicit algorithm and it can simulate the crack propagation in practice.The findings in this study may have important significance in engineering application.
作者
刘德政
王中任
李炎
LIU Dezheng;WANG Zhongren;LI Yan(Department of Mechanical Engineering,Hubei University of Arts and Science,Xiangyang 441053,CHN)
出处
《制造技术与机床》
北大核心
2018年第11期85-91,共7页
Manufacturing Technology & Machine Tool
基金
湖北省教育厅科学技术研究项目(Q20172603)
关键词
冷镦钢
动态载荷
算法
有限元
裂纹扩展
cold heading steel
dynamic loading
algorithm
finite element
crack propagation
