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首页> 外文期刊>International Journal of Solids and Structures >Two mechanisms of ductile fracture: void by void growth versus multiple void interaction
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Two mechanisms of ductile fracture: void by void growth versus multiple void interaction

机译：韧性断裂的两种机制：空洞生长引起的空洞与多重空洞相互作用

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Two distinct mechanisms of crack initiation and advance by void growth have been identified in the literature on the mechanics of ductile fracture. One is the interaction a single void with the crack tip characterizing initiation and the subsequent void by void advance of the tip. This mechanism is represented by the early model of Rice and Johnson and the subsequent more detailed numerical computations of McMeeking and coworkers on a single void interacting with a crack tip. The second mechanism involves the simultaneous interaction of multiple voids on the plane ahead of the crack tip both during initiation and in subsequent crack growth. This mechanism is revealed by models with an embedded fracture process zone, such as those developed by Tvergaard and Hutchinson. While both mechanisms are based on void nucleation, growth and coalescence, the inferences from them with regard to crack growth initiation and growth are quantitatively different. The present paper provides a formulation and numerical analysis of a two-dimensional plane strain model with multiple discrete voids located ahead of a pre-existing crack tip. At initial void volume fractions that are sufficiently low, initiation and growth is approximately represented by the void by void mechanism. At somewhat higher initial void volume fractions, a transition in behavior occurs whereby many voids ahead of the tip grow at comparable rates and their interaction determines initiation toughness and crack growth resistance. The study demonstrates that improvements to be expected in fracture toughness by reducing the population of second phase particles responsible for nucleating voids cannot be understood in terms of trends of one mechanism alone. The transition from one mechanism to the other must be taken into account. (C) 2002 Elsevier Science Ltd. All rights reserved. [References: 17]
机译：在有关韧性断裂力学的文献中，已经确定了两种不同的裂纹萌生和空隙增长的机制。一种是与裂纹尖端的单个空隙相互作用的特征，裂纹的特征在于开始，随后的裂纹由尖端的空隙前进表征。这种机制由Rice和Johnson的早期模型以及随后在单个空隙中与裂纹尖端相互作用的McMeeking和同事的更详细的数值计算来表示。第二种机制涉及在裂纹萌生和随后的裂纹扩展过程中，裂纹尖端之前的平面上的多个空隙同时相互作用。具有嵌入式断裂过程区域的模型（例如Tvergaard和Hutchinson开发的模型）揭示了这种机制。虽然这两种机制都基于空洞形核，生长和聚结，但从它们得出的关于裂纹扩展开始和扩展的推论在数量上是不同的。本文提供了一个二维平面应变模型的公式化和数值分析，该模型具有多个离散空隙，这些空隙位于预先存在的裂纹尖端之前。在初始空隙体积分数足够低的情况下，通过空隙机理，空隙大约代表了引发和生长。在较高的初始空隙体积分数下，会发生行为转变，从而导致尖端前端的许多空隙以相当的速率生长，并且它们的相互作用决定了起始韧性和抗裂纹扩展性。研究表明，仅通过一种机理的趋势就无法理解通过减少负责使空洞成核的第二相颗粒的数量来提高断裂韧性。必须考虑从一种机制到另一种机制的过渡。 （C）2002 Elsevier ScienceLtd。保留所有权利。 [参考：17]

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