铁路钢轨钢材三点弯曲试样的弹塑性有限元分析  

FEM ANALYSIS ON THE ELASTO-PLASTIC PERFORMANCE OF THREE-POINT-BEND SPECIMENS OF RAIL STEEL

作　　者：王元清[1] 冯宝锐[1] 石永久[1] 

机构地区：[1]清华大学土木工程系结构工程与振动教育部重点实验室,北京100084

出　　处：《低温建筑技术》2008年第6期1-3,共3页Low Temperature Architecture Technology

基　　金：国家自然科学基金项目(No.50778002和No.50078029);铁道部-清华大学科技研究基金项目(T2000410)

摘　　要：对铁路钢轨钢材标准三点弯曲试样的弹塑性断裂性能进行了系统研究与分析。通过有限元计算结果与试验结果进行对比,验证了钢轨钢材的脆性破坏特征。采用普通单元和奇异单元的网格计算应力和位移进行了分析。并对裂纹尖端CTOD值进行了计算分析,CTOD值沿试样厚度方向的变化很小,裂纹尖端始终处于三向拉伸应力状态。而三向拉应力状态将使裂纹尖端处的塑性变形受到很大限制,破坏时的塑性变形很小,更容易发生脆性破坏。It＇ s significant to study the elasto - plastic fracture performance of the standard three point bend specimens of mils steel. By FEM and the results of experiments, the brittle fracture character of mils steel is proved. The analysis were made on stresses and displacements by standard elements and singularity el- ements. The analysis was also made to calculate CTOD. The CTOD values change slightly along the thickness of specimens. Crack tip is always in the three - direction tension stress condition, so the plastic deformation of crack tip is limited. And the brittle fracture is easier to occur.

关 键 词：三点弯曲试样 弹塑性 钢轨钢材 C10D 

分 类 号：U213.4[交通运输工程—道路与铁道工程]