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arXiv 1607.01137cond-mat.soft
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三维复合型载荷下的裂纹前缘不稳定性

Crack front instabilities under mixed mode loading in three dimensions

Hervé Henry

摘要:

本文采用无应力边界条件的三维相场模型,研究了复合型载荷(Ⅰ + Ⅲ)作用下裂纹前缘的演化。如先前在凝胶中实验观察到的,即使对于初始模式混合度$K_{III}/K_{I}$的高值,也存在朝向$K_{III}=0$没有任何前碎裂的几何形状的松弛。的初始条件的影响进行了研究,它表明,在初始狭缝的不规则性可以导致前面的破碎的比率$K_{III}/K_{I}$较小的值,如在实验中观察到的。

英文摘要:

The evolution of a crack front under mixed mode loading (I+III) is studied using a phase field model in 3 dimensions with no stress boundary conditions. As previously observed experimentally in gels, there is a relaxation toward a geometry where $K_{III}=0$ without any front fragmentation even for high values of the initial mode mixity $K_{III}/K_{I}$. The effects of the initial condition is studied and it is shown that irregularities in the initial slit can lead to front fragmentation for smaller values of the ratio $K_{III}/K_{I}$ as is observed in experiments.

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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