激光超声测量T800/QY9511复合材料工程常数的有限元模拟

为了获取T800/QY9511复合材料的工程常数,利用有限元软件ABAQUS,通过将激光线源等效为力源,模拟了脉冲激光作用于材料表面、激发在材料内部传播的超声波的过程,并在激励点对心处提取波形,得到了5个体波波速,进而根据克里斯托菲尔弹性理论计算了工程常数。结果表明,与真实值相比,弹性模量数值解的平均误差为1.56%,泊松比数值解的平均误差为2.98%,剪切模量数值解的误差为1.4%。激光超声方法在复合材料工程常数测量上具有可行性与准确性,为实验室测量相关参量及其工程应用提供了依据。

Finite element simulation of engineering constants of T800/QY9511 composites measured by laser ultrasonic

In order to obtain the engineering constants of T800/QY9511 composites, by using finite element software ABAQUS and taking laser line source as force source, the process of pulse laser acting on the surface of the material and stimulating ultrasonic waves propagating inside the material was simulated. And the waveform was extracted from the center of excitation, 5 individual wave velocities were obtained. According to Christoffel theory of elasticity, the engineering constants were calculated. The results show that, compared with the real value, the average error of the numerical solution of elastic modulus is 1.56%. The mean error of Poisson ratio is 2.98%. The error of shear modulus numerical solution is 1.4%. Laser ultrasonic method is feasible and accurate in measuring the engineering constants of composite materials. It provides the basis for measuring relevant parameters in laboratory and engineering application.