单向复合纤维材料弹性系数的超声测量

Determination of elastic constants of unidirectional composite using ultrasonic method

本文将单向复合纤维材料视作六角对称晶体，认为其弹性特征由五个独立的弹性系数来描述。利用Christoffel方程，我们得到这一各向异性介质中不同方向的声波速度与弹性系数的关系．我们还建立了一套计算机控制的实验测量系统，通过它对纤维板样品中的声速进行测量，反演得到了五个独立的弹性系数C11、C33、C13、C14和C12。理论计算得到的声速和实验测量值吻合较好，表明我们的方法是有实用意义的。

The composite concerned is treated as material of hexagonal symmetry with five independent elastic constants. The Christoffel equation is solved to give the propagation velocities of the three elastic waves in this anisotropic medium. A computer-controlled ekperimental system is developed for measuring the sound propagation Velocties in the composite plate. The unknown five elastic constants C11, C33, C13, C44, and C12 are reconstructed. The velocity values calculated by using the constructed elastic constants are in good agreement with the experimental ones.