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arXiv 0801.2101cond-mat.mtrl-scicond-mat.othernlin.PS
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作为准静态裂纹扩展框架的热断裂

Thermal fracture as a framework for quasi-static crack propagation

F. Corson, M. Adda-Bedia, H. Henry, E. Katzav

摘要:

我们解决的问题,解析和数值模拟的裂纹扩展下的热载荷的模型系统中的裂纹路径预测。我们表明,只需使用局部对称原理和格里菲斯准则就可以解释从直线裂纹扩展到波浪裂纹扩展的不稳定性。然后,我们认为,应力强度因子的计算可以与标准的裂纹扩展准则相结合,以获得任何加载配置内的裂纹尖端的演化方程。热裂纹问题的理论结果与我们使用相场模型进行的数值模拟一致。此外,事实证明,相场模型允许澄清直和振荡裂纹之间的过渡的性质被证明是超临界的。

英文摘要:

We address analytically and numerically the problem of crack path prediction in the model system of a crack propagating under thermal loading. We show that one can explain the instability from a straight to a wavy crack propagation by using only the principle of local symmetry and the Griffith criterion. We then argue that the calculations of the stress intensity factors can be combined with the standard crack propagation criteria to obtain the evolution equation for the crack tip within any loading configuration. The theoretical results of the thermal crack problem agree with the numerical simulations we performed using a phase field model. Moreover, it turns out that the phase-field model allows to clarify the nature of the transition between straight and oscillatory cracks which is shown to be supercritical.

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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