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首页> 外文期刊>International Journal for Numerical Methods in Engineering >A medial-axis-based model for propagating cracks in a regularised bulk
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A medial-axis-based model for propagating cracks in a regularised bulk

机译：基于中轴的正则化裂纹扩展模型

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摘要

A new continuous-discontinuous strategy for the simulation of failure is presented. The continuous bulk is regularised by means of a gradient-enhanced damage model, where non-locality is introduced at the level of displacements. As soon as the damage parameter is close or equal to 1, a traction-free crack is introduced. To determine the direction of crack growth, a new criterion is proposed. In contrast to traditional techniques, where mechanical criteria are used to define the crack path, here, a geometrical approach is used. More specifically, given a regularised damage field D(x), we propose to propagate the discontinuity following the direction dictated by the medial axis of the isoline (or isosurface in 3D) D(x) = D*. The proposed approach is tested on different two-dimensional and three-dimensional examples that illustrate that this combined methodology is able to deal with damage growth and material separation. Copyright (c) 2014 John Wiley & Sons, Ltd.
机译：提出了一种新的连续-不连续故障模拟策略。连续体积通过梯度增强损伤模型进行正则化，其中在位移级别引入了非局部性。一旦损伤参数接近或等于1，就会引入无牵引裂纹。为了确定裂纹扩展的方向，提出了一个新的准则。与使用机械准则定义裂纹路径的传统技术相反，此处使用几何方法。更具体地说，给定规则的损伤场D（x），我们建议按照等值线（或3D等值面）的中间轴所指示的方向传播不连续性D（x）= D *。所提出的方法在不同的二维和三维示例上进行了测试，这些示例说明该组合方法能够处理损伤增长和材料分离。版权所有（c）2014 John Wiley＆Sons，Ltd.

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