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Effects of thermal stress and imperfect interfacial bonding on the mechanical behavior of composites subjected to off-axis loading

机译：热应力和不完善的界面粘结对轴外复合材料力学性能的影响

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摘要

Metal matrix composites exhibit inelastic response due to the viscoplasticity of matrix, and imperfect interfacial bonding will decrease the flow stress sharply. The present study develops the generalized model of cells (CMC) to predict mechanical behavior of unidirectional metal matrix composites with imperfect interfacial bonding, which is subjected to off-axis loading. The model incorporates viscoplastic model for the matrix and interfacial debonding model for the fiber/matrix interface. The effects of fiber volume fraction and thermal residual stress on stress-strain response of composites are also discussed. Results show that stress-strain response influenced by fiber cross-section shape becomes more evident with the increase of fiber off-axis angle. Similar stress-strain response can be found in the early stage of loading regardless of the thermal residual stress. However, the effect of thermal residual stress on the stress-strain behavior of composites with imperfect interfacial bonding is closely dependent on fiber off-axis angle in the plastic stage.
机译：金属基复合材料由于基体的粘塑性而表现出非弹性响应，而不完善的界面结合将大大降低流动应力。本研究开发了通用的单元格模型（CMC），以预测具有不完善的界面粘结的单向金属基复合材料的机械行为，该复合材料承受轴外载荷。该模型包含用于基质的粘塑性模型和用于纤维/基质界面的界面脱粘模型。还讨论了纤维体积分数和热残余应力对复合材料应力应变响应的影响。结果表明，随着纤维离轴角的增加，受纤维截面形状影响的应力应变响应变得更加明显。不管热残余应力如何，在加载的早期阶段都可以发现相似的应力应变响应。然而，热残余应力对界面粘结不完善的复合材料应力应变行为的影响与塑性阶段的纤维离轴角密切相关。

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  • 来源
    《Materials Science and Engineering》 |2010年第30期|p.7530-7537|共8页
  • 作者

    Junjie Ye; Xuefeng Chen; Zhi Zhai; Bing Li; Yanyang Zi; Zhengjia He;

  • 作者单位

    State Key Laboratory for Manufacturing Systems Engineering, Xi'anjiaotong University, Xi'an, Shaanxi 710049, People's Republic of China;

    State Key Laboratory for Manufacturing Systems Engineering, Xi'anjiaotong University, Xi'an, Shaanxi 710049, People's Republic of China;

    State Key Laboratory for Manufacturing Systems Engineering, Xi'anjiaotong University, Xi'an, Shaanxi 710049, People's Republic of China;

    State Key Laboratory for Manufacturing Systems Engineering, Xi'anjiaotong University, Xi'an, Shaanxi 710049, People's Republic of China;

    State Key Laboratory for Manufacturing Systems Engineering, Xi'anjiaotong University, Xi'an, Shaanxi 710049, People's Republic of China;

    State Key Laboratory for Manufacturing Systems Engineering, Xi'anjiaotong University, Xi'an, Shaanxi 710049, People's Republic of China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    thermal residual stress; interfacial debonding; off-axis loading; stress-strain response;

    机译：热残余应力;界面剥离离轴负载;应力应变反应;

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