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首页> 外文学位 >PREDICTIONS OF LIFE OF METALS SUBJECTED TO MULTIAXIAL FATIGUE LOADING (CRACK PROPAGATION, J-INTEGRAL, MIXED MODE, EXPERIMENTAL DATA).
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PREDICTIONS OF LIFE OF METALS SUBJECTED TO MULTIAXIAL FATIGUE LOADING (CRACK PROPAGATION, J-INTEGRAL, MIXED MODE, EXPERIMENTAL DATA).

机译：预测多轴疲劳载荷下金属的寿命（裂纹传播，J积分，混合模式，实验数据）。

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摘要

A review of the literature on multiaxial fatigue is presented; it summarizes empirical trends and discusses available life prediction approaches. An evaluation of three of the more promising approaches for predicting multiaxial fatigue life is then presented. The first approach is that used in Code Case N-47-12 of Section III of the ASME Boiler and Pressure Vessel Code. This approach is based on a strain range parameter similar to the octahedral shear strain range. The other two approaches are recently proposed ones. The first uses plastic work done during multiaxial cyclic straining as a fatigue damage parameter. The other is a criterion based on maximum range of shear strain, modified by a fraction of normal strain range action on the plane experiencing maximum shear strain range. Evaluation of the approaches is based on data available in the literature as well as data from the author's tests of specimens of A533B pressure vessel steel. In these deflection-controlled tests, specimens were subjected to combined bending and torsion, applied both in-phase and 90(DEGREES) out-of-phase, at two different fixed ratios of applied torsional shear strain range to bending strain range, and at several strain ranges to produce lives between approximately 10('3) and 10('6) cycles. In general, it was found that the plastic work approach was superior to the others. Differences in crack formation and growth behavior with differences in the above test parameters are presented, and their significance discussed in terms of development of improved methods for predicting multiaxial fatigue life. A new theory for predicting crack propagation rates for complex multiaxial loading is subsequently developed. This theory is based on physical mechanisms of crack propagation and uses the J-intergral as the crack growth parameter for both high-cycle and low-cycle fatigue. A procedure for estimating the J-integral for mixed mode cracking is developed. Subsequent evaluation of this theory, using data from tests done on A533B steel, proves promising.
机译：介绍了有关多轴疲劳的文献。它总结了经验趋势，并讨论了可用的寿命预测方法。然后介绍了三种预测多轴疲劳寿命的更有前景的方法的评估。第一种方法是ASME锅炉和压力容器规范第三部分的规范案例N-47-12中使用的方法。该方法基于类似于八面体剪切应变范围的应变范围参数。最近提出了另外两种方法。首先使用在多轴循环应变过程中完成的塑性加工作为疲劳损伤参数。另一个是基于最大剪切应变范围的标准，该标准通过在经历最大剪切应变范围的平面上的正常应变范围作用的一部分进行修改。方法的评估是基于文献中的数据以及作者对A533B压力容器钢样品进行的测试数据。在这些受挠度控制的测试中，试样经受了弯曲和扭转的联合作用，同相和90（DEGREES）异相地施加，施加的扭转剪切应变范围与弯曲应变范围的固定比率为两个不同，并且几个应变范围可产生大约10（'3）和10（'6）个循环之间的寿命。通常，发现塑性加工方法优于其他方法。介绍了裂纹形成和生长行为的差异以及上述测试参数的差异，并根据改进的预测多轴疲劳寿命的方法的发展讨论了其重要性。随后开发了一种预测复杂多轴载荷下裂纹扩展速率的新理论。该理论基于裂纹扩展的物理机制，并使用J积分作为高周疲劳和低周疲劳的裂纹扩展参数。开发了用于估计混合模态裂纹的J积分的过程。随后使用来自A533B钢的测试数据对这一理论进行了评估，证明是很有希望的。

著录项

  • 作者

    ROSTAMI, ALI.;

  • 作者单位

    Stanford University.;

  • 授予单位 Stanford University.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 1986
  • 页码 228 p.
  • 总页数 228
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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