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首页> 外文会议>International Conference on Mechanical Engineering and Mechanics vol.1; 20051026-28; Nanjing(CN) >Damage Localization - a Precursor to Failure
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Damage Localization - a Precursor to Failure

机译：损害本地化-失败的先兆

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摘要

This paper reviews the concept of damage localization and its application to time-independent (quasi-static) and time-dependent processes in heterogeneous materials. For quasi-static process in a heterogeneous material with Weibull distribution, damage can be expressed by a function of state variable. Accordingly, the criterion for damage localization depends on Weibull modulus m. In particular, damage localization can appear even though stress gradient remains fixed and it is closely related to strain localization. For time-dependent process, damage evolution law can be expressed by a function of stress and damage f(σ,D). Accordingly, the criterion for damage localization can be expressed by f_D > f/D. Provided damage evolution law can be expressed by kinetics of microdamage, it is found that intrinsic Deborah number D~* plays a key role in damage localization. The criterion for damage localization has been applied to two extremes of time-dependent processes: spallation under wave loading and creep.
机译：本文回顾了损伤局部化的概念及其在异质材料中与时间无关（准静态）和时间相关过程的应用。对于具有威布尔分布的异质材料中的准静态过程，损伤可以用状态变量的函数表示。因此，损伤定位的标准取决于威布尔模量m。特别是，即使应力梯度保持固定，损伤局部化也可能出现，并且与应变局部化密切相关。对于随时间变化的过程，可以通过应力和损伤f（σ，D）的函数来表示损伤演化定律。因此，损伤定位的标准可以由f_D> f / D表示。假定破坏演化规律可以用微损伤的动力学来表达，则发现内在的德博拉数D〜*在损伤局部化中起关键作用。损伤定位的标准已应用于两个与时间有关的极端过程：波浪载荷下的剥落和蠕变。

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