| 残余应力对压力容器破坏模式的影响分析 |
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| 引用本文： | 栗明,许金泉. 残余应力对压力容器破坏模式的影响分析[J]. 力学季刊, 2007, 28(1): 92-97 |
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| 作者姓名： | 栗明 许金泉 |
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| 作者单位： | 上海交通大学,船舶海洋与建筑工程学院工程力学系,上海,200240;上海交通大学,船舶海洋与建筑工程学院工程力学系,上海,200240 |
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| 摘 要： | 破前漏(简称LBB)是压力容器、核电站设备结构设计与评价中的一个重要准则.表面裂纹准静态扩展的几何形貌变化规律的预测是破前漏(LBB)评判十分重要的课题之一.本文对特定焊接残余应力场加载作用下,含三维表面裂纹的压力容器模型,用有限元软件(ABAQUS)进行了表面裂纹准静态扩展模拟计算,得到在此残余应力场作用下应力强度因子沿裂纹前缘的分布规律.结合外载引起的应力强度因子,就可以判别裂纹的扩展形貌,从而判断结构是否满足LBB要求.
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| 关 键 词： | 表面裂纹 裂纹稳态扩展 有限元模拟计算(ABAQUS) 应力强度因子 破前漏 |
| 文章编号： | 0254-0053（2007）01-92-6 |
| 收稿时间： | 2006-11-20 |
| 修稿时间： | 2006-11-20 |
Effects of Residual Stress on Failure Mode of Pressure Vessels |
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| LI Ming,XU Jin-quan. Effects of Residual Stress on Failure Mode of Pressure Vessels[J]. Chinese Quarterly Mechanics, 2007, 28(1): 92-97 |
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| Authors: | LI Ming XU Jin-quan |
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| Affiliation: | Department of Engineering Mechanics, Shanghai Jiaotong Univ, Shanghai 200240, China |
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| Abstract: | Leak before break(LBB) is an important concept for assessing pressure vessels and nuclear equipment.The prediction of geometric features of surface crack propagation under quasi-static loading is recognized as one of the attractive projects in LBB assessment.With the use of commercial FEM code ABAQUS,the stress intensity factors of surface cracks were analyzed,under a given residual welding stresses.Based on the distribution of stress intensity factors along crack front,the evolution styles of geometric features of quasi-static surface crack propagation was discussed. |
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| Keywords: | surface crack crack propagation finite element method(ABAQUS) stress intensity factor leak before break |
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