复合材料强度准则中耦合系数取值范围的研究

STUDY OF THE RANGE OF TAKING VALUE FOR COUPLING COEFFICIENTS IN THE STRENGTH CRITERION FOR COMPOSITES

复合材料的统一型强度准则比张量强度准则更简单，更突出了影响复合材料强度的主要参数；但同样碰到了其耦合强度系数难以确定的问题。本文从基本强度系数出发，根据破坏曲面必须闭合的特点，推导出了两个三次耦合系数Ｆ（ｘｓｓ）和Ｆ（ｙｓｓ）的取值范围，对于这两个系数的确定提供了理论依据。

The strength criterion of unified modes for composite materials is simpler and more outstanding for major parameters of affecting the strength of composites than the tensor strength criterion. However,its coupling strength coefficients are,just as the case in the tensor strength criterion, difficult to be determined. Started from the basic strength coefficients and based on the characteristic that the surface of failure must be close, this paper derives the range of taking value for cubic coupling coefficients Fyssand Fyssand provides the theoretical basis for the determination of the two coefficients.