反射裂缝裂尖位于面层中且裂缝长度大于某一值时，应力强度因子随着摩擦系数的增加而减小。
The SIF decreases with the friction coefficient rising when the surface crack tip lies in the base and the reflective crack length is more than a certain value.
证明了在总反射能量系数为最小时，其各点摩擦系数的最佳分布为一确定的渐增序列。
It may be shown that the optimum distribution of the friction coefficient of points on the absorber is a gradually increasing series when the total reflection energy coefficient is at minimum.
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