紧凑拉伸试样应力场仿真与磁记忆效应分析  

Compact tension specimen stress field simulation with F and magnetic memory effect analysis

作　　者：刘国奇 付任珍 李新蕾 邓胤[2] 

机构地区：[1]杭州华安无损检测技术有限公司,杭州310023 [2]无损检测技术教育部重点实验室(南昌航空大学),南昌330063

出　　处：《无损探伤》2014年第6期17-20,共4页Nondestructive Testing Technology

基　　金：国家自然科学基金(基金号51065022)

摘　　要：利用ANSYS有限元仿真,对30CrMnSiNi2A钢二维预制裂纹的紧凑拉伸疲劳试样进行模拟分析。仿真得到了裂纹尖端附近的应力强度因子K和J积分值,及其应力场分布情况。发现两个积分值的曲线能较好地反映材料的受力情况。然后通过疲劳试验,测量了试件相应部位的磁记忆信号,得出的试验结果与仿真分析结论较为符合。有效地证明了磁记忆信号能较好地反映工件的应力分布状态,可为磁记忆检测的实际工程应用提供技术支撑。Through finite element analysis（FEA）,2Dprefabricated crack of 30CrMnSiNi2 Acompact tension fatigue specimen was computed and analyzed.Simulate stress intensity factor Kand Jintegral value,stress field distribution around crack tip were calculated.Found that the curve of two integral force values can reflect the material.Then through the fatigue test,the measurement of the magnetic memory signals corresponding parts of the specimen,the test results obtained with the simulation analysis is more consistent with the conclusions.Proved magnetic memory signals could reflect the stress distribution of the workpiece effectively,which provide technical support for the actual engineering application of magnetic memory testing.

关 键 词：紧凑拉伸 应力场 应力强度因子 磁记忆检测 

分 类 号：TG115.28[金属学及工艺—物理冶金]