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首页> 外文期刊>Engineering Fracture Mechanics >Creep constraint and fracture parameter C ? for axial semi-elliptical surface cracks with high aspect ratio in pressurized pipes
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Creep constraint and fracture parameter C ? for axial semi-elliptical surface cracks with high aspect ratio in pressurized pipes

机译：蠕变约束和裂缝参数 c ？用于加压管中具有高纵横比的轴半椭圆形表面裂缝

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摘要

The unified creep constraint parameterAcand fracture parameterC?for axial semi-elliptical surface cracks with high aspect ratio in pressurized pipes have been investigated by three-dimensional finite element analyses. The results show that the constraint level near surface part is lower than that at the deeper part of crack front. With increasing crack aspect ratioa/cand decreasing crack deptha/t, the constraint levels decrease. The parameterAcsolution for high aspect ratio cracks has been obtained. The crack aspect ratioa/chas significant effect on theC?distributions along the crack fronts. For high aspect ratio cracks, the maximumC?along the crack fronts occurs near surface part. With increasing crack aspect ratioa/cfrom 0.2 to 2, the creep crack initiation location will change from the deepest part of the crack front to the near surface part. For high aspect ratio cracks, if the calculations ofC?andAcat the deepest point is used to predict creep crack initiation life, non-conservative results may be produced. More benefits from incorporating constraint effects may be obtained for creep life assessments of pipes with high aspect ratio cracks due to their lower constraint.
机译：通过三维有限元分析研究了统一的蠕变约束参数分裂参数，用于加压管中具有高纵横比的轴半椭圆形表面裂缝。结果表明，表面部分附近的约束水平低于裂缝前沿的深层的约束水平。随着裂缝宽高比的增加，减少裂缝深度/ T，约束水平降低。获得了高纵横比裂缝的参数凝结。裂缝宽高比对Thec的显着影响？沿着裂缝前沿的分布。对于高纵横比裂缝，最大电量沿着裂缝前沿发生在表面部分附近。随着裂缝宽高比的增加0.2至2，蠕变裂纹启动位置将从裂缝前面的最深部分变为近表面部分。对于高纵横比裂缝，如果官方的计算？安卡特最深点用于预测蠕变裂纹启动寿命，则可以产生非保守结果。由于其较低的约束，可以获得掺入约束效果的蠕变寿命评估来获得更多益处。

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  • 来源
    《Engineering Fracture Mechanics》 |2018年第2018期|共14页
  • 作者

    X.M. Tan; G.Z. Wang; S.T. Tu; F.Z. Xuan;

  • 作者单位

    Key Laboratory of Pressure Systems and Safety Ministry of Education East China University of Science and Technology;

    Key Laboratory of Pressure Systems and Safety Ministry of Education East China University of Science and Technology;

    Key Laboratory of Pressure Systems and Safety Ministry of Education East China University of Science and Technology;

    Key Laboratory of Pressure Systems and Safety Ministry of Education East China University of Science and Technology;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程力学;
  • 关键词

    Creep constraint; Fracture parameterC?; High aspect ratio; Crack; Pipe;

    机译：蠕变约束;裂缝参数频率？;高纵横比;裂缝;管道;

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