Q460C高强钢材断裂韧性的弹塑性有限元分析  

FEM ANALYSIS ON FRACTURE TOUGHNESS OF Q460C HIGH-STRENGTH STEEL

作　　者：林云[1] 王元清[2] 张延年[1] 石永久[2] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]土木工程安全与耐久教育部重点实验室清华大学土木工程系,北京100084

出　　处：《低温建筑技术》2012年第2期1-4,共4页Low Temperature Architecture Technology

基　　金：国家自然科学基金项目(51178244和50778102)

摘　　要：应用ANSYS软件对Q460C高强钢材标准三点弯试样断裂韧性进行弹塑性数值模拟,验证高强钢材常温下的裂纹敏感性。采用实体单元SOLID95计算刀口张开位移、三向应力分布以及裂纹尖端张开位移CTOD值,表明沿试样厚度方向,CTOD值变化较小,靠近裂纹尖端呈三向拉应力状态,偏离尖端一定距离呈复杂的应力状态,且复杂应力较大限制了裂纹尖端的塑性发展;不考虑低温影响因素时,缺陷对Q460C钢材的影响较大,当裂纹塑性发展后,Q460C钢材表现为较大的缺陷敏感性。It＇s necessary to study on the elasto-plastic fracture performance of the standard three point bend specimen of Q460C high strength construction steel,by ANSYS finite element software.The crack sensitivity of Q460C steel at room temperature was proved.The analysis was made on displacements of notch,three-dimensional stresses as well as crack tip opening displacement by solid 95 elements.The CTOD values changed slightly along thickness of specimens.While next to the crack tip,there was three-dimensional tensile stress state.However,there converted to complex stress while it deviated from the tip a certain distance.Without considering the temperature factor,it impacted on toughness of Q460C steel greatly was its defect.After plasticity development of the crack,Q460C steel showed greater sensitivity to defects.

关 键 词：Q460C钢材 断裂韧性 弹塑性 有限元分析 

分 类 号：TU391[建筑科学—结构工程]