• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>International Conference on Offshore Mechanics and Arctic Engineering, Jun 23-28, 2002, Oslo, Norway >New Limit State Functions for Determining the Puncture Resistance to External Force
【24h】

New Limit State Functions for Determining the Puncture Resistance to External Force

机译：确定极限抗外力的新极限状态函数

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Traditionally, a key component of the design philosophy applied to high-pressure pipelines has been the stipulation that the nominal hoop stress is less than some fraction of the specified minimum yield strength (SMYS). However, more recently both designers and operators have recognised that whilst this approach generally leads to conservatively safe designs, there may be some situations in which the conservatism is not adequate. This has resulted in a move towards limit state, and structural reliability based, methods that address actual failure modes, and consequently the contributions to structural integrity of other factors in addition to stress. One such failure mode is the puncture of a pipeline wall due an external force. This situation can arise from the impact of excavating machinery for onshore pipelines or drop objects and anchors for offshore lines. A limit state function describing this failure mode is given in DNV guidelines No 13. However, this function does not take account of the internal pressure. In this paper the influence of pressure on the pipeline indentation is addressed using both theoretical and finite element analyses. A closed-form solution of force-deformation relationship based on a consideration of rigid-plastic deformation theory, that gives a good agreement with results from both FE analyses and experimental tests, is presented. The analytical results show that indentation force, and the maximum stress/strain, required to produce a given dent depth, increase with increasing internal pressure. However, the relationship between indentation force and maximum stress/strain is not sensitive to internal pressure. The analysis therefore shows that an indentation force criterion governed solely by the dent depth, such as that given in DNV guidelines No. 13, may be highly unconservative when the pressure in the pipeline is high. Consequently, a new local denting criterion for puncture of pressurised pipes, which is based the maximum acceptable strain of the pipe material, and thereby removes the above unconservatsim, has been proposed and is presented in this paper.
机译：传统上，应用于高压管道的设计原理的一个关键组成部分是规定：名义环向应力小于规定的最小屈服强度（SMYS）的几分之一。但是，最近，设计人员和操作人员都认识到，尽管这种方法通常可以带来保守的安全设计，但在某些情况下保守性是不够的。这导致转向极限状态和基于结构可靠性的方法来解决实际的失效模式，因此，除了应力之外，其他因素也对结构完整性做出了贡献。一种这样的失效模式是由于外力导致的管道壁的刺穿。这种情况可能是由于陆上管道的挖掘机械或海上管道的下落物体和锚栓的影响而引起的。 DNV准则第13号给出了描述此故障模式的极限状态功能。但是，此功能未考虑内部压力。本文使用理论分析和有限元分析来解决压力对管道压痕的影响。提出了一种基于刚塑性变形理论的力-变形关系的封闭形式解，该解与有限元分析和实验测试的结果都很好地吻合。分析结果表明，产生给定凹痕深度所需的压入力和最大应力/应变会随着内部压力的增加而增加。但是，压入力和最大应力/应变之间的关系对内部压力不敏感。因此，分析表明，当管道中的压力较高时，仅由凹痕深度控制的压痕力标准（例如DNV准则第13号中给出的标准）可能非常不保守。因此，在本文中提出并提出了一种新的局部打孔标准，该标准用于打孔加压管道，该准则基于管道材料的最大可接受应变，从而消除了上述不保守性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号