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A new model for predicting low cycle fatigue behavior of discontinuously reinforced metal matrix composites.

机译：预测不连续增强金属基复合材料低周疲劳行为的新模型。

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摘要

An analytical model for predicting the crack initiation life of low cycle fatigue (LCF) of discontinuously reinforced metal matrix composites (DR-MMCs) has been proposed. The effects of the volume fraction V f, cyclic strain hardening exponent n' and cyclic strength coefficient K' on the LCF crack initiation life of DR-MMCs were analyzed. While both the lower level of the plastic strain amplitude and the lower Vf were found to increase the LCF crack initiation resistance, the effects of n' and K' were more complicated. By considering the enhanced dislocation density in the matrix and the load bearing effect of particles, a quantitative relationship between the LCF life of DR-MMCs and particle size was also derived. This model showed that a decreasing particle size results in a longer LCF life. The theoretical predictions based on the proposed models were found to be in good agreement with the experimental data reported in the literature.
机译：提出了一种预测不连续增强金属基复合材料（DR-MMCs）低周疲劳（LCF）的裂纹萌生寿命的分析模型。分析了体积分数V f，循环应变硬化指数n'和循环强度系数K'对DR-MMCs的LCF裂纹萌生寿命的影响。虽然较低的塑性应变幅度水平和较低的Vf均可增加LCF裂纹萌生抵抗力，但n'和K'的影响更为复杂。通过考虑基质中位错密度的提高和颗粒的负载效应，得出了DR-MMCs的LCF寿命与粒径之间的定量关系。该模型表明减小的粒度导致更长的LCF寿命。发现基于所提出的模型的理论预测与文献中报道的实验数据非常吻合。

著录项

  • 作者

    Zhang, Qian.;

  • 作者单位

    Ryerson University (Canada).;

  • 授予单位 Ryerson University (Canada).;
  • 学科 Engineering Mechanical.
  • 学位 M.A.Sc.
  • 年度 2004
  • 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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