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arXiv 1611.03374math.AP
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二维Griffith静态断裂模型强极小解的存在性

Existence of strong minimizers for the Griffith static fracture model in dimension two

Sergio Conti, Matteo Focardi, Flaviana Iurlano

摘要:

我们考虑二维Griffith断裂模型,证明了具有闭跳集和连续可微形变场的强极小解的存在性。一个关键的成分,这是本文件的对象,是一个概括的衰减估计德乔治,Carriero和Leaci的矢量的情况。这是基于替代coarea公式的方法来近似$SBD^p$功能与小跳跃设置的Sobolev功能,并限于二维。其他两个成分包含在同伴文件,分别包括在正则性结果向量椭圆问题的弹性类型和方法来近似的能量$GSBD^p$功能的$SBV^p$的。

英文摘要:

We consider the Griffith fracture model in two spatial dimensions, and prove existence of strong minimizers, with closed jump set and continuously differentiable deformation fields. One key ingredient, which is the object of the present paper, is a generalization of the decay estimate by De Giorgi, Carriero, and Leaci to the vectorial situation. This is based on replacing the coarea formula by a method to approximate $SBD^p$ functions with small jump set by Sobolev functions and is restricted to two dimensions. The other two ingredients are contained in companion papers and consist respectively in regularity results for vectorial elliptic problems of the elasticity type and in a method to approximate in energy $GSBD^p$ functions by $SBV^p$ ones.

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