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Two-parameter fracture mechanics analysis of mixed-mode specimens under static and fatigue loading.

机译：静态和疲劳载荷下混合模式试样的两参数断裂力学分析。

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摘要

The T-stress is a constant stress that acts parallel to the crack-front. In two-parameter fracture mechanics, the T-stress in conjunction with the stress intensity factor (SIF) is an important parameter for characterizing the stress state in the vicinity of a crack-tip. Due to its importance in characterizing the crack-tip stress field, T-stress values were calculated using finite element analysis (FEA) for a center cracked plate (CCP) and single-edge cracked plate (SECP) specimen. The T-stress values for both the CCP and SECP specimens were determined for cracks with relative sizes varying from 0.1 to 0.8 with respect to the specimen width and oriented at various angles between 0° and 90° with respect to the horizontal.;The crack-tip stress field is defined in terms of both the SIF and the T-stress using the William's series expansion [Williams, 1957]. The crack-tip stress field is incorporated into the Von Mises yield formula to develop an expression that models the crack-tip plastic zone under static mixed-mode loading conditions influenced by T-stress. Using the static plastic zone expression, the plastic zone is mapped and analyzed for various combinations of mode II to mode I SIF ratios and T-stress. The static plastic zone expression enables the characterization of constraint and fracture resistance under mixed-mode conditions.;The static plastic zone expression is adapted for cyclic loading conditions and used to develop a fatigue crack propagation model that takes into account the effect of both mixed-mode loading and T-stress. Finally, the cyclic plastic zone expression is used to demonstrate the significance of T-stress when predicting fatigue crack growth.
机译：T应力是平行于裂纹前沿的恒定应力。在两参数断裂力学中，T应力与应力强度因子（SIF）一起是表征裂纹尖端附近应力状态的重要参数。由于其在表征裂纹尖端应力场方面的重要性，因此使用有限元分析（FEA）计算了中心裂纹板（CCP）和单边缘裂纹板（SECP）试样的T应力值。确定了CCP和SECP样品的T应力值，这些裂纹的相对尺寸相对于样品宽度在0.1至0.8之间变化，并且相对于水平方向在0°至90°之间的不同角度定向。尖端应力场是根据William的级数展开式根据SIF和T应力定义的[Williams，1957]。将裂纹尖端应力场合并到Von Mises屈服公式中，以开发一个表达式，该模型对受T应力影响的静态混合模式载荷条件下的裂纹尖端塑性区建模。使用静态塑性区表达式，可对塑性区进行映射和分析，以获取模式II与模式I SIF比率和T应力的各种组合。静态塑性区表达式可以表征混合模式条件下的约束和抗断裂性能。静态塑性区表达式适用于循环载荷条件，用于建立考虑了两种混合效应的疲劳裂纹扩展模型。模式加载和T应力。最后，循环塑性区表达式用于证明预测疲劳裂纹扩展时T应力的重要性。

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  • 作者

    Nazarali, Qays N.;

  • 作者单位

    Carleton University (Canada).;

  • 授予单位 Carleton University (Canada).;
  • 学科 Engineering Civil.;Engineering Materials Science.;Engineering Mechanical.
  • 学位 M.A.Sc.
  • 年度 2009
  • 页码 197 p.
  • 总页数 197
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;机械、仪表工业;工程材料学;
  • 关键词

  • 入库时间 2022-08-17 11:38:25

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