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首页> 外文会议>International Conference on Structural Integrity and Fracture, SIF 2002, Sep 25-27, 2002, Perth, Australia >Determination of Softening Law by measuring crack opening displacements
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Determination of Softening Law by measuring crack opening displacements

机译：通过测量裂纹张开位移确定软化规律

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摘要

A method for the determination of a softening curve characterising the behaviour of a material inside the process zones developing ahead of a crack is investigated. The method uses the data on crack opening displacements to recover: length, stresses inside the zone and its opening. It is based on solving a non-classical boundary value problem formulated as overdetermined on a visual part of the crack (where both stresses and crack opening displacements are known) with no boundary conditions prescribed in the process zone. An integral equation written with respect to the cohesive stresses is reduced to an ill-posed linear algebraic system whose regular solution is found by singular value decomposition. Stability of solutions is investigated by conducting a number of numerical experiments. Examples of softening curve reconstructions are presented.
机译：研究了一种确定软化曲线的方法，该软化曲线表征了出现在裂纹之前的工艺区内的材料的行为。该方法使用裂缝开口位移的数据进行恢复：长度，区域内部及其开口的应力。它基于解决非经典边界值问题的公式，该问题被公式化为在裂纹的视觉部分（已知应力和裂纹张开位移均已知）上过高确定的条件，而工艺区域中未规定边界条件。关于内聚应力写的积分方程被简化为一个不适定的线性代数系统，其正则解是通过奇异值分解找到的。通过进行大量的数值实验来研究溶液的稳定性。给出了软化曲线重建的示例。

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