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arXiv 1802.01412math.AP
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部分无穷系数Lamé方程组的包含凸性与梯度集中

The convexity of inclusions and gradient's concentration for Lamé systems with partially infinite coefficients

Yuanyuan Hou, Hongjie Ju, Haigang Li

摘要:

研究复合材料中两个相邻刚性夹杂之间的应力集中问题是一个有趣的问题,它可以用具有部分无穷大系数的Lamé系统来模拟。为了克服椭圆型方程组缺乏最大值原理的困难,我们利用能量方法和迭代技巧研究了解的梯度估计。我们首先发现了一个新的现象,即当两个相邻的夹杂物不再是局部相对严格凸时,即狭窄区域的顶部和底部边界部分“平坦”时,梯度不再爆破。这与我们的期望相反。为了进一步探索梯度的爆破机制,我们接下来研究两个相邻的夹杂物的相对凸度为m阶,并最终揭示了一个潜在的关系之间的爆破率的应力和相对凸度的子域在所有维度。

英文摘要:

It is interesting to study the stress concentration between two adjacent stiff inclusions in composite materials, which can be modeled by the Lamé system with partially infinite coefficients. To overcome the difficulty from the lack of maximum principle for elliptic systems, we use the energy method and an iteration technique to study the gradient estimates of the solution. We first find a novel phenomenon that the gradient will not blow up any more once these two adjacent inclusions fail to be locally relatively strictly convex, namely, the top and bottom boundaries of the narrow region are partially "flat". This is contrary to our expectation. In order to further explore the blow-up mechanism of the gradient, we next investigate two adjacent inclusions with relative convexity of order m and finally reveal an underlying relationship between the blow-up rate of the stress and the order of the relative convexity of the subdomains in all dimensions.

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