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首页> 外文学位 >Three-dimensional Fracture Mechanics Analyses of Single Edge Cracked Plate Specimens.
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Three-dimensional Fracture Mechanics Analyses of Single Edge Cracked Plate Specimens.

机译：单边裂纹板试样的三维断裂力学分析。

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摘要

In this thesis, the stress intensity factor K I, T11 and T 33 stresses along the crack front of the single edge cracked plate (SECP) specimens with the crack surface subjected to uniform, linear, parabolic or cubic stress distribution are calculated by three-dimensional finite element analyses. The relative crack depth, a/W, is varied by 0.2, 0.4, 0.6 or 0.8. And the relative thickness, t/W, is chosen by 0.1, 0.2, 0.5, 1.0, 2.0 or 4.0, respectively. For engineering applications, empirical equations of normalized stress intensity factor K I, T11 and T33 stress at the mid-plane are obtained.;The stress state around the crack front in the three-dimensional SECP specimens described by the stress intensity factor KI, T11 and T33 stresses are compared to the results from the finite element analyses. The differences between the Williams' expansion and finite element analyses varied by angle, radius and thickness are presented.;The thickness effect for the three parameters of stress intensity factor KI, T11 and T 33 stresses at the mid-plane of the SECP specimen is discussed in this thesis. The stress distribution applied on the crack surface is uniform pressure. In order to study the thickness effect completely, additional cases with relative thickness, t/W=0.0025, 0.025, 0.05, 8, 16 for crack surface subjected to the uniform stress distribution are calculated by finite element analyses. In addition, the relative crack depth effect of the stress intensity factor KI, T11 and T33 stresses at the mid-plane of the SECP specimen is discussed as well. The three parameters variation along the crack front are also investigated.
机译：本文利用三维方法计算了沿裂纹表面受到均匀，线性，抛物线或三次应力分布的单边裂纹板（SECP）试样沿裂纹前沿的应力强度因子KI，T11和T 33。有限元分析。相对裂纹深度a / W变化0.2、0.4、0.6或0.8。相对厚度t / W分别选择0.1、0.2、0.5、1.0、2.0或4.0。对于工程应用，获得了中平面归一化应力强度因子KI，T11和T33应力的经验方程式;三维SECP试样中裂纹前沿周围的应力状态由应力强度因子KI，T11和将T33应力与有限元分析的结果进行比较。给出了Williams膨胀和有限元分析之间随角度，半径和厚度而变化的差异。应力强度因子KI，T11和T 33的三个参数在SECP试样中平面处的厚度效应为本文讨论。施加在裂纹表面上的应力分布是均匀的压力。为了全面研究厚度效应，通过有限元分析计算了裂纹表面受均匀应力分布的相对厚度t / W = 0.0025、0.025、0.05、8、16的其他情况。此外，还讨论了SECP试样中平面处应力强度因子KI，T11和T33应力的相对裂纹深度影响。还研究了沿裂纹前沿的三个参数变化。

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  • 作者

    Jin, Zhaoyu.;

  • 作者单位

    Carleton University (Canada).;

  • 授予单位 Carleton University (Canada).;
  • 学科 Applied Mechanics.;Engineering Mechanical.
  • 学位 M.A.Sc.
  • 年度 2012
  • 页码 185 p.
  • 总页数 185
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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