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首页> 外文期刊>Thin-Walled Structures >Limit loads for un-cracked and circumferential through-wall cracked pipe bends under torsion moment considering geometric nonlinearity
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Limit loads for un-cracked and circumferential through-wall cracked pipe bends under torsion moment considering geometric nonlinearity

机译：考虑几何非线性的扭转力矩下无裂纹和周向贯穿壁开裂管弯的极限载荷

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摘要

This paper is dedicated to providing a detailed plastic collapse load analysis for un-cracked and circumferential through-wall cracked pipe bends under torsion moment by three dimensional FE methods considering geometric nonlinearity. For un-cracked pipe bends results show that radius-to-thickness is the main factors affecting the plastic collapse load. For cracked pipe bends the weakening factor decreases with increasing crack length, and the decreasing rate exhibits three typical stages which performs a similar trend with that in bending case. Although the weakening factor in plastic collapse load shows the similar variation based on geometric nonlinearity with that based on geometric linearity change, the limit load solutions based on geometric linearity fail to be used in prediction for torsion load based on geometric nonlinearity. So estimating limit load solutions by FE method are proposed, which shows a better choice compared with the past solutions. Furthermore the effect of yield strain is considered with the normalized parameter proposed to represent this weakening effect of yield strain on torsion moment. Results show that pipe parameters bend radius-to-radius and crack length have little impact on the weakening parameter, however radius-to-thickness have an obvious impact on the weakening parameter, which increases with decreasing weakening parameter. Results also show that radius to-thickness has a great impact on the ovality deformation, while bend radius-to-radius hasn't. Therefore geometry effect is significant for a high yield strain value and a high radius-to-thickness value.
机译：本文致力于通过考虑几何非线性的三维有限元方法，为扭转力矩下未破裂和周向贯穿壁破裂的弯管提供详细的塑性破坏载荷分析。对于未开裂的弯管，结果表明，半径到厚度是影响塑性破坏载荷的主要因素。对于开裂的弯管，其削弱因子随着裂纹长度的增加而减小，并且下降速率呈现出三个典型阶段，与弯曲情况下的趋势相似。尽管塑性破坏载荷的弱化因子显示出基于几何非线性的变化与基于几何线性变化的变化相似，但基于几何线性的极限载荷解却不能用于基于几何非线性的扭转载荷的预测。因此，提出了用有限元方法估算极限载荷的方法，与过去的方法相比，它显示了更好的选择。此外，还考虑了屈服应变的影响，并提出了归一化参数来表示屈服应变对扭转力矩的这种减弱作用。结果表明，管道参数弯曲半径与半径和裂纹长度对弱化参数影响不大，而半径对厚度对弱化参数有明显影响，并且随着弱化参数的减小而增加。结果还表明，半径厚度对椭圆度变形影响很大，而弯曲半径半径则没有。因此，对于高屈服应变值和高半径-厚度值来说，几何效应是显着的。

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  • 来源
    《Thin-Walled Structures》 |2017年第7期|37-52|共16页
  • 作者

    Li Jian; Zhou Chang-Yu; Chang Le; Miao Xin-Ting; He Xiao-Hua;

  • 作者单位

    Nanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Jiangsu, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Pipe bends; Torsion moment; Weakening factor; Yield strain;

    机译：弯管;扭转力矩;弱化系数;屈服应变;

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