铸造孔洞对辙叉应力应变场的影响  

Effects of cast pore on stress and strain field of frog

作　　者：陈林 刘帅 葛银磊 李冬冬 冯运莉 张福成 CHEN Lin;LIU Shuai;GE Yin-lei;LI Dong-dong;FENG Yun-li;ZHANG Fu-cheng(College of Metallurgy and Energy,North China University and Technology,Tangshan 063210,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210

出　　处：《塑性工程学报》2023年第10期174-180,共7页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51801063);河北省自然科学基金资助项目(E2021209080);河北省省属高校基本科研业务费资助项目(JQN2022014)。

摘　　要：利用同步辐射三维断层扫描技术获取了铸造辙叉心轨内部的孔洞形貌信息,建立了无孔洞辙叉、含有规则椭球形孔洞辙叉以及复杂形貌铸造孔洞辙叉的有限元模型,对比研究了孔洞形貌以及孔洞深度对辙叉最大VON Mises应力和塑性应变的影响。结果表明,尺寸为Φ220μm的微小孔洞虽然对辙叉的应力、塑性应变分布形式不造成显著影响,但孔洞附近产生严重的应力、应变集中;并且与规则椭球形孔洞模型对比,含铸造孔洞模型由于缺陷形貌的不规则变化,将引起更加严重的应力、应变集中现象;随铸造孔洞所处深度增加,辙叉模型的最大应力、塑性应变集中值逐渐减小;当孔洞处于8 mm深度处,辙叉最大应力、塑性应变值与无孔洞模型相近。The morphology information of pore inside the center rail of cast frog was obtained by synchrotron radiation three dimensional computed tomography technique.The finite element models of frog without pore,frog with regular ellipsoid pore and frog with cast pore with complex morphology were established.The effects of pore morphologies and pore depth on the maximum VON Mises stress and plastic strain of frog were studied.The results show that although the micro pore with size ofΦ220μm has not significantly effect on the stress and plastic strain distribution of the frog,serious stress and strain concentration occur near the pore.Compared with the frog with regular ellipsoid pore model,the frog model with cast pore causes more serious stress and strain concentration due to the irregular change of defect morphology.With the increase of cast pore depth,the maximum stress and plastic strain concentration values of the frog model gradually decrease.When the depth of cast pore is 8 mm,the maximum stress and plastic strain values of the frog are similar to those of the frog model without pore.

关 键 词：高锰钢 辙叉 铸造孔洞 三维断层扫描 应力场 应变场 

分 类 号：TG245[金属学及工艺—铸造]