纤维增强复合媒质中的超声散射

为了用超声方法评价纤维增强复合媒质中纤维/母材的界面特性，本文建立了三层柱状固体媒质声散射截面积和纤维增强复合媒质中声衰减的计算方法。当纤维/母材界面层厚度与波长相比很小时，用两个劲度常数描述纤维与母材之间力学量的边界条件，得到了计算纤维增强媒质中声衰减的简化模型。本文还从数值上计算了纤维/铝复合媒质中超声纵波衰减与界面特性、超声频率的关系。

Ultrasonic wave scattering in a fiber reinforced composite

In order to evaluate the fiber/matrix interfaces in a fiber reinforced composite, this paper pres sents a mathematical algorithm for predicting the scattering cross section of a cylindrical three-layered medium and the sound attenuation due to the scattering in the composite. When the thickness of the fiber/matrix interface layer is small compared to the wavelength, two stiffness constants are used to simulate the boundary conditions and a simplified method for predicting the sound scattering is developed. Numerical compunctions have been made for the relations of longitudinal wave attenuation coefficients in a glass fiber/aluminum composite with the interface properties and wave frequencies.