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M-integral analysis for cracks in a viscoplastic material with extended finite element method

机译： m

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摘要

TheM-integral can be used to quantify complex damage in materials subjected to mechanical deformation. However, the effect of viscoplasticity on the damage level associated with theM-integral has not been studied yet. In this paper, the variation of theM-integral associated with viscoplastic deformation was investigated numerically using a user-defined material subroutine. Effects of creep deformation and loading rate on theM-integral were also evaluated. In particular, the association of crack growth with the evolution of theM-integral was captured by the extended finite element method for different crack configurations. It was found that viscoplastic deformation has a great effect on the damage evolution of viscoplastic materials characterized by theM-integral. Crack growth leads to an increase of theM-integral, indicating progressive damage of the materials. Concerning the secondary cracks formed around a major crack, the results show that theM-integral is highly dependent on the numbers and locations of those secondary cracks. Shielding effect is mostly evident for microcracks with centres located just behind or vertically in line with the major crack tip. With the increasing number of microcracks, the shielding effect tends to decrease as reflected by the increasingM-integral values.
机译：它们的整体可用于量化经受机械变形的材料的复杂损坏。然而，尚未研究粘胶塑料对与它们相关的损伤水平的影响。在本文中，使用用户定义的材料子程序在数值上进行数值研究与粘塑性变形相关的它们的变化。还评估了蠕变变形和加载率对它们的影响 - 积分的影响。特别地，通过延长的有限元方法对不同的裂纹配置的延长有限元方法捕获了裂缝增长与它们积分的裂缝增长的关联。发现粘胶塑化变形对具有它们的粘性材料的损伤演化具有很大的效果 - 积分。裂缝增长导致它们的积分增加，表明材料的渐进损坏。关于围绕着大裂纹形成的二次裂缝，结果表明它们 - 积分高度依赖于这些二次裂缝的数量和位置。屏蔽效果大多是在与主要裂缝尖端落后或垂直的中心的微裂纹很明显。随着越来越多的微裂纹，屏蔽效果往往会随着增加的积分值的反射而降低。

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  • 来源
    《Engineering Fracture Mechanics》 |2018年第2018期|共18页
  • 作者

    Junling Hou; Hong Zuo; Qun Li; Rong Jiang; Liguo Zhao;

  • 作者单位

    State Key Laboratory for Strength and Vibration of Mechanical Structures Shaanxi Key Laboratory of Environment and Control for Flight Vehicle Shaanxi Engineering Research Center of Nondestructive Testing and Structural Integrity Evaluation School of Ae;

    State Key Laboratory for Strength and Vibration of Mechanical Structures Shaanxi Key Laboratory of Environment and Control for Flight Vehicle Shaanxi Engineering Research Center of Nondestructive Testing and Structural Integrity Evaluation School of Ae;

    State Key Laboratory for Strength and Vibration of Mechanical Structures Shaanxi Key Laboratory of Environment and Control for Flight Vehicle Shaanxi Engineering Research Center of Nondestructive Testing and Structural Integrity Evaluation School of Ae;

    College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics;

    Wolfson School of Mechanical Electrical and Manufacturing Engineering Loughborough University;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程力学;
  • 关键词

    TheM-integral; Viscoplastic material model; Multiple cracks; Extended finite element method; Crack growth; Shielding effect;

    机译：它们 - 积分;粘胶材料模型;多裂缝;延长有限元法;裂纹增长;屏蔽效果;

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