| 内压和面内弯矩作用下含局部减薄弯头塑性极限载荷的有限元分析 |
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| 引用本文： | 陈钢, 张传勇, 刘应华. 内压和面内弯矩作用下含局部减薄弯头塑性极限载荷的有限元分析[J]. 工程力学, 2005, 22(2): 43-49. |
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| 作者姓名： | 陈钢 张传勇 刘应华 |
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| 作者单位： | 1.中国特种设备检测研究中心, 北京, 100013;2. 清华大学工程力学系, 北京, 100084 |
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| 基金项目： | 全国高等学校优秀博士学位论文作者专项基金;国家科技攻关项目 |
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| 摘 要： | 局部减薄是一种压力管道表面常见的体积型缺陷,它不仅会降低管道的承载能力,而且还可能引起管道破坏,导致严重的事故。采用数值分析方法,对内压和面内弯矩作用下含局部减薄弯头的极限载荷进行了研究,分析了载荷组合、缺陷形状、位置、尺寸对弯头极限承载能力的影响,讨论了导致弯头破坏的典型失效模式。计算结果为含缺陷弯头的安全评定提供了一定的理论依据。
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| 关 键 词： | 弯头 局部减薄 塑性极限载荷 数值分析 失效模式 |
| 文章编号： | 1000-4750(2005)02-0043-07 |
| 收稿时间： | 2003-04-25 |
| 修稿时间： | 2003-08-25 |
FINITE ELEMENT ANALYSIS OF PLASTIC LIMIT LOADS OF LOCALLY THINNED ELBOWS UNDER INTERNAL PRESSURE AND IN-PLANE BENDING MOMENT |
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| CHEN Gang, ZHANG Chuan-yong, LIU Ying-hua. FINITE ELEMENT ANALYSIS OF PLASTIC LIMIT LOADS OF LOCALLY THINNED ELBOWS UNDER INTERNAL PRESSURE AND IN-PLANE BENDING MOMENT[J]. Engineering Mechanics, 2005, 22(2): 43-49. |
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| Authors: | CHEN Gang ZHANG Chuan-yong LIU Ying-hua |
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| Affiliation: | 1.Center for China Special Equipment Inspection and Research, Beijing 100013, China;2. Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China |
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| Abstract: | Local wall-thinning, which is a common defect on the surfaces of pipelines, can not only reduce the load-carrying capacities, but also cause the serious failure accidents of pipelines. To study the problem, a numerical method for evaluation of plastic limit loads is adopted in this paper. Based on a large number of computational examples, the effects of axial, circumferential, small and large area local wall-thinnings with different sizes on load-carrying capacities and failure modes of pipelines under internal pressure and in-plane bending moment are discussed. |
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| Keywords: | elbow local wall thinning plastic limit load numerical analysis failure mode |
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