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arXiv 1808.00542math.NAcs.NAmath.AP
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相场模型在线性化和有限弹性中的裂纹驱动力

On the crack-driving force of phase-field models in linearized and finite elasticity

Universität Siegen(锡根大学)

Carola Bilgen, Kerstin Weinberg

AI总结:

本文研究了相场模型在线性和有限弹性材料中的裂纹驱动力问题,通过不同变分公式和基于断裂力学的启发式驱动力,验证了通用方法的优越性。

摘要:

相场方法用于断裂已被证明是一种数学上严谨且易于实现的方法,用于计算具有任意裂纹路径的裂纹传播。裂纹生长由能量最小化驱动,导致变分裂纹驱动力。然而,从与张力相关的能量泛函中定义这种力,并不总是与断裂力学中已建立的破坏准则一致。在本文中,讨论了不同变分公式,并提出了受一般断裂力学考虑启发的即兴驱动力。通过一系列数值示例展示了通用方法的优越性。

英文摘要:

The phase-field approach to fracture has been proven to be a mathematically sound and easy to implement method for computing crack propagation with arbitrary crack paths. Hereby crack growth is driven by energy minimization resulting in a variational crack-driving force. The definition of this force out of a tension-related energy functional does, however, not always agree with the established failure criteria of fracture mechanics. In this work different variational formulations for linear and finite elastic materials are discussed and ad-hoc driving forces are presented which are motivated by general fracture mechanical considerations. The superiority of the generalized approach is demonstrated by a series of numerical examples.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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