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High cycle fatigue life prediction model including the effects of prior cold work and surface residual stress.

机译：高周疲劳寿命预测模型，包括先前的冷作和表面残余应力的影响。

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摘要

The high cycle fatigue (HCF) endurance limit of strain hardening materials is shown to be dependent on local values of residual stress and prior cold work. Empirical and numerical approaches to determining these local values are defined and demonstrated. These approaches are then used to establish an equation defining this dependence for a specific material, mean stress, and temperature.; Field data from high cycle fatigue failures of specific compressor tie bolts is used as a practical test case to validate application of the derived equation. It is also shown that the thread manufacturing process directly influences the thread fatigue capability by influencing the local residual stress and prior cold work. A key process parameter is strain rate. Empirical and finite element techniques demonstrate that the differences in strain rate between the rolling processes used in studs provided by two different suppliers result in different levels of prior cold work and residual stress in the threads. Fatigue diagrams are drawn for two thread rolling processes based upon measured thread and rolled plate data, and are shown to be consistent with field experience. A practical test is defined for qualifying acceptable thread rolling processes, using measured values of local Knoop microhardness. Finally, generic application of these methods to all strain hardening metals is indicated.; It is concluded that these same methods may be used for qualification of fatigue capabilities influenced by other component manufacturing or surface enhancement processes such as turning, shotpeening or burnishing.
机译：结果表明，应变硬化材料的高循环疲劳（HCF）耐久性极限取决于残余应力和先前的冷加工的局部值。确定和演示了确定这些局部值的经验和数值方法。然后，这些方法被用来建立方程式，以定义对特定材料，平均应力和温度的依赖性。来自特定压缩机拉杆的高周疲劳故障的现场数据被用作实际测试案例，以验证所推导方程的应用。还显示出，螺纹制造过程通过影响局部残余应力和先前的冷加工而直接影响螺纹疲劳能力。关键工艺参数是应变率。经验和有限元技术表明，由两个不同的供应商提供的双头螺栓所使用的轧制工艺之间的应变率差异会导致先验冷作和螺纹中的残余应力水平不同。根据测得的螺纹和轧制板数据绘制了两个螺纹轧制过程的疲劳图，并显示出与现场经验一致。使用局部努氏显微硬度的测量值定义了一种实际测试，以限定合格的滚丝工艺。最后，指出了这些方法在所有应变硬化金属上的一般应用。结论是，这些相同的方法可用于鉴定受其他零件制造或表面增强工艺（例如车削，喷丸或抛光）影响的疲劳能力。

著录项

  • 作者

    Herron, William Lee.;

  • 作者单位

    Clemson University.;

  • 授予单位 Clemson University.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2000
  • 页码 205 p.
  • 总页数 205
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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