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Interface debonding and thermal fatigue life of Ni base alloy composite

机译：镍基合金复合材料的界面剥离和热疲劳寿命

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摘要

Interface debonding is a common feature in Ni base alloy composite.The apparent toughness of composites is much greater than that of either the matrix or the particles.This is attributed to the crack path deflection around.A lot of work has been done to comprehend the role of inclusions on strength,ductility and toughness.This branch of micromechanics has become extremely sophisticated in recent years with extensive computational modeling to unravel nucleation,growth and coalescence of voids around inclusions to explain ductile fracture of engineering alloys.However,there is a need for quantifying the pivotal role played by particles during debonding.To predict the interface debonding of Ni base alloy composite,a suitable mixed-mode interface fracture criterion is required.A special emphasis is given to energetics of in-terfacial arc crack growth to shed more light on the role of elastic mismatch between the ellipsoidal particles and the surrounding matrix.If the thermal expansion coefficients and elastic modulus of Ni base alloy and ceramic particles are different,there will be thermal stresses between particles and matrix in thermosyphon.The thermal stress will arouse the initiation and growth of thermal fatigue crack.First,the three-phase model was used to determine the disturbance strain in two-phases cell aroused by thermal inconsistency.Thinking average stresses in effective matrix vanish,the thermal stress field in Ni base alloy and particles can be gotten.As the interface-crack propagates around the ellipsoidal ceramic particles,the strain energy release rate is examined.When the strain energy release rate reaches the critical value of the matrix,the ultimate debonding stress can be determined.The subtending angle and initiation crack length can be obtained.Finally,based on low-cycle fatigue crack growth rate formation,the thermal fatigue life was computed.The bigger thermal stress is,the smaller thermal fatigue life is.Thermal fatigue life is an exponential function of crack initiation length and critical length.
机译：界面剥离是镍基合金复合材料的一个共同特征，复合材料的表观韧性远大于基体或颗粒的韧性，这归因于裂纹路径的偏转，人们已经做了很多工作来理解近年来，微机械的这一分支已经变得极为复杂，它通过广泛的计算模型来解开夹杂物周围的空洞的形核，生长和聚结，以解释工程合金的延性断裂。但是，仍然需要为了预测颗粒在脱粘过程中所起的关键作用。预测镍基合金复合材料的界面脱粘，需要一个合适的混合模式界面断裂准则。特别强调界面电弧裂纹扩展的能量学，以消除更多的脱落。阐明了椭圆形粒子与周围基质之间弹性失配的作用。镍基合金和陶瓷颗粒的效率和弹性模量不同，热虹吸管中的颗粒与基体之间会产生热应力。热应力会引起热疲劳裂纹的产生和扩展。首先，采用三相模型确定由热不一致性引起的两相电池的扰动应变。考虑有效基体中的平均应力消失，可以获得镍基合金和颗粒的热应力场。当界面裂纹在椭圆形陶瓷颗粒周围扩散时，应变检查能量释放速率。当应变能量释放速率达到基体的临界值时，可以确定最终的剥离应力。可以获得对角和初始裂纹长度。最后，基于低周疲劳裂纹扩展速率热应力越大，热疲劳寿命越小。热疲劳寿命是指数的裂纹萌生长度和临界长度的函数。

著录项

  • 来源
    《国际断裂力学2009年会》|2009年|285-290|共6页
  • 会议地点 Chengdu(CN);Chengdu(CN)
  • 作者

    Xinhua Ni; Xiequan Liu; Baohong Han; Haixing Lu; Guohui Zhong;

  • 作者单位

    Department of Basic Course,Mechanical Engineering College,97 Hepingxi Road,Shijiazhuang 050003,China;

    Department of Basic Course,Mechanical Engineering College,97 Hepingxi Road,Shijiazhuang 050003,China;

    Department of Basic Course,Mechanical Engineering College,97 Hepingxi Road,Shijiazhuang 050003,China;

    Department of Basic Course,Mechanical Engineering College,97 Hepingxi Road,Shijiazhuang 050003,China;

    Department of Basic Course,Mechanical Engineering College,97 Hepingxi Road,Shijiazhuang 050003,China;

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

    Interface debonding; Thermal fatigue life; Ni base alloy; Ellipsoidal ceramic particle; Composite;

    机译：界面剥离;热疲劳寿命;镍基合金;椭球形陶瓷颗粒;复合材料;

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