45钢内部裂纹愈合过程孔洞闭合的数值模拟  

Numerical Simulation on Void Closing in Inner Crack Healing Process of 45 Steel

作　　者：张永军[1] 韩静涛[1] 刘靖[1] 余万华[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《热加工工艺》2008年第10期80-83,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(59889101);高等学校博士学科点专项科研基金资助项目(2003008001)

摘　　要：在塑性变形条件下,内裂纹愈合过程一般经历裂纹的闭合及焊合两个阶段。闭合阶段可使裂纹内界面充分接近,为焊合阶段实现界面的金属键结合提供有利条件。本文以带有内部球形孔洞的45钢圆柱体试样为例,利用大型有限元分析软件ANSYS,数值模拟了压缩变形时试样内部球形孔洞的闭合过程,分析了孔洞闭合过程形态演化特点和孔洞附近的应力状态。The inner crack healing process experiences two stages of closing and metallurgical bonding of crack under plastic deformation. The closing stage decreases the distance between interfaces of inner crack and provides a advantageous condition for metallic bonding of the interfaces in metallurgical bonding stage. The cylinder sample with inner spherical void was taken as an example of 45 steel, the closing stage of inner spherical void in the sample was simulated using the large finite element method software ANSYS, the morphological evolution and stress state around the void were analyzed in closing process of inner spherical void.

关 键 词：45钢 内裂纹愈合 孔洞闭合 数值模拟 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]