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高韧性管道钢裂纹尖端张开角测试研究

发表时间:2013-08-15  浏览量:1167  下载量:447
全部作者: 王俊强,帅健
作者单位: 中国石油大学(北京)机械与储运工程学院;中国特种设备检测研究院压力管道事业部
摘 要: 为准确测试高级别管道钢的断裂韧性,对修正的双曲悬臂梁(modified double cantilever beam, MDCB)试样进行撕裂失效分析,改进设计了一种新型的修正紧凑拉伸(modified compact tension, MCT)试样,利用数字图像修正技术试验测试了X80管材的裂纹尖端张开角(crack tip opening angle, CTOA),基于Gurson损伤模型模拟分析了X80管材的三维裂纹扩展规律。对比2种试样的CTOA结果,得出如下结论:MCT试样在厚度方向有更大的测量范围,且得到的CTOA值准确性更高。试验和有限元模拟得到的CTOA值基本一致,验证了Gurson损伤模型评估管道钢断裂韧性的有效性。在稳态裂纹扩展阶段,试样在不同厚度层得到了相同的CTOA值。
关 键 词: 断裂力学;裂纹尖端张开角;测试方法;管道钢;韧性撕裂;损伤断裂模拟
Title: Testing research of crack tip opening angle for high toughness pipeline steels
Author: WANG Junqiang, SHUAI Jian
Organization: College of Mechanical and Transportation Engineering, China University of Petroleum, Beijing; Pressure Pipeline Department, China Special Equipment Inspection and Research Institute
Abstract: In order to accurately measure the fracture toughness of high-grade pipeline steels, new modified compact tension (MCT) specimen were designed by the tearing failure analysis for the modified double cantilever beam (MDCB) specimen. Furthermore, the crack tip opening angle (CTOA) of X80 pipeline steel was measured using digital image correction technology, and the rule of three-dimensional crack propagation for X80 steel was simulated on the basis of the Gurson damage model. By comparing the CTOA results with two specimens, it was showed that the MCT specimen had a larger measuring range in the thickness direction, and the obtained CTOA values had higher accuracy. The measured CTOA values of X80 steel was consistent with those from experimental and FE simulation method, which verified the validity of the Gurson damage model for evaluating the fracture toughness of pipeline steels. In addition, the same CTOA values were obtained with the different thickness layer in the steady-state crack growth stage.
Key words: fracture mechanics; crack tip opening angle; testing method; pipeline steel; ductile tearing; damage and fracture simulation
发表期数: 2013年8月第15期
引用格式: 王俊强,帅健. 高韧性管道钢裂纹尖端张开角测试研究[J]. 中国科技论文在线精品论文,2013,6(15):1450-1456.
 
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