...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of engineering materials and technology >A Simple and Efficient Reformulation of the Classical Manson-Coffin Curve to Predict Lifetime Under Multiaxial Fatigue Loading-Part II: Notches
【24h】

A Simple and Efficient Reformulation of the Classical Manson-Coffin Curve to Predict Lifetime Under Multiaxial Fatigue Loading-Part II: Notches

机译：简单有效地重新设计经典曼森-棺材曲线，以预测多轴疲劳载荷下的寿命-第二部分：缺口

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The present study is concerned with the use of the modified Manson-Coffin curve method to estimate the lifetime of notched components subjected to multiaxial cyclic loading. The above criterion postulates that fatigue strength under complex loading paths can efficiently be evaluated in terms of maximum shear strain amplitude, provided that the reference Manson-Coffin curve used to predict the number of cycles to failure is defined by taking into account the actual degree of multiaxialityonproportionality of the stress/ strain state damaging the assumed crack initiation site. The accuracy and reliability of the above fatigue life estimation technique was checked by considering about 300 experimental results taken from the literature. Such data were generated by testing notched cylindrical samples made of four different metallic materials and subjected to in-phase and out-of-phase biaxial nominal loading. The accuracy of our criterion in taking into account the presence of nonzero mean stresses was also investigated in depth. To calculate the stress/strain quantities needed for the in-field use of the modified Manson-Coffin curve method, notch root stresses and strains were estimated by using not only the well-known analytical tool due to Koettgen et al. (1995, "Pseudo Stress and Pseudo Strain Based Approaches to Multiaxial Notch Analysis, " Fatigue Fract. Eng. Mater. Struct., 18(9), pp. 981-1006) (applied along with the ratchetting plasticity model devised by Jiang and Sehitoglu (1996, "Modelling of Cyclic Ratchetting Plasticity, Part I: Development and Constitutive Relations. Transactions of the ASME," ASME J. Appl. Mech., 63, pp. 720-725; 1996, "Modelling of Cyclic Ratchetting Plasticity, Part I: Development and Constitutive Relations," Trans. ASME J. Appl. Mech., 63, pp. 720-725)) but also by taking full advantage of the finite element method to perform some calibration analyses. The systematic use of our approach was seen to result in estimates falling within an error factor of about 3.
机译：本研究涉及使用改良的Manson-Coffin曲线方法来估计承受多轴循环载荷的缺口构件的寿命。上述标准假定，可以通过最大剪切应变幅值有效地评估复杂载荷路径下的疲劳强度，但前提是用于预测失效循环数的参考曼森-科芬曲线是通过考虑实际疲劳程度来确定的。应力/应变状态的多轴性/非比例性破坏了假定的裂纹萌生部位。通过考虑文献中约300个实验结果，检验了上述疲劳寿命估算技术的准确性和可靠性。通过测试由四种不同金属材料制成的带凹口的圆柱形样品并经受同相和异相双轴标称载荷来生成此类数据。我们还深入研究了考虑非零平均应力存在时我们准则的准确性。为了计算现场使用改进的曼森-科芬曲线法所需的应力/应变量，不仅使用了Koettgen等人的著名分析工具，还估计了缺口根应力和应变。 （1995年，“基于伪应力和伪应变的多轴缺口分析方法”，《疲劳分形》，《工程学》，《结构》，第18卷，第9期，第981-1006页）（与Jiang和他设计的棘轮塑性模型一起应用） Sehitoglu（1996，“循环不安定可塑性的建模，第一部分：ASME的发展与本构关系。交易”，ASME J. Appl。机械，63，第720-725页； 1996，“循环不安定的可塑性建模，第一部分：发展与本构关系，” Trans。ASME J. Appl。Mech。，63，第720-725页），但也充分利用了有限元方法来进行一些标定分析。系统地使用我们的方法可以看到估计值落在大约3的误差因子之内。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号