X80钢三点弯曲裂纹扩展试验及有限元模拟  

Crack propagation of three-point bending test and finite element simulation for steel X80

作　　者：方剑 邱保文 袁泽喜[3] FANG Jian;QIU Baowen;YUAN Zexi(College of Electromechanical and Automotive Engineering,Huanggang Normal University,Huanggang 438000,China;Wuhan Branch of Bao Steel Central Research Institute,Wuhan 430080,China;College of Materials and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]黄冈师范学院机电与汽车工程学院,湖北黄冈438000 [2]宝钢股份中央研究院武汉分院,湖北武汉430080 [3]武汉科技大学材料与冶金学院,湖北武汉430081

出　　处：《兵器材料科学与工程》2020年第3期99-103,共5页Ordnance Material Science and Engineering

基　　金：湖北省自然科学基金(2019CFC837);湖北省技术创新重点项目(2019AFB753);黄冈师范学院高级别培养项目(201814803)。

摘　　要：通过三点弯曲加载方式对X80钢进行裂纹扩展试验,采用GTN模型对裂纹扩展进行有限元模拟分析。结果表明:试样中心部位孔洞充分扩张,边缘部位小孔洞沿滑移带不断形核聚合,裂纹扩展量由试样中心向厚度边缘逐渐降低,形成类似草帽的宏观形貌;孔洞初始体积分数φ0对GTN模型预测结果影响显著,当试样厚度中心和边缘部位的φ0分别为0.0015和0.0002时,可获得与试验较接近的有限元模拟结果。Crack propagation of steel X80 was tested by method of three-point bending,and the finite element simulation was carried out with GTN model. The results show that the void in central area of specimen fully expands while tiny voids in the edge continuously nucleate and coalesce along the slip band,and the length of crack propagation decreases from the center to the edge to form a macroscopic shape similar to straw hat. The simulation results agree well with the test results when the initial volume fraction of void φ0 in center area and the edge of specimen are 0.001 5 and 0.000 2 respectively,as the φ0 in GTN model has a significant effect on the prediction results.

关 键 词：X80管线钢 裂纹扩展 GTN模型 有限元模拟 

分 类 号：TG113.2[金属学及工艺—物理冶金]