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研究了具有非完好黏接界面的球形粒子对弹性波的散射以及含分布球形增强粒子的复合材料中的弹性波多重散射.首先,在弹簧模型下研究了单个球粒子的弹性波散射问题.然后在统计平均意义下研究了具有随机分布粒子的复合材料中的有效波以及有效波波速和衰减的计算公式.进一步根据有效波波速和衰减对界面常数的依赖关系,研究了界面损伤对有效波波速和衰减的影响.在此基础上提出了一种依据超声测量数据对界面损伤进行无损估计的方法.针对Sic-Al复合材料进行了数值模拟.计算了不同界面损伤程度情况下的有效波波速和衰减.并利用遗传算法对含不同误差水平的合成实验数据就界面损伤进行了反演计算.数值结果表明对含随机误差的合成实验数据进行反演计算能对界面损伤程度作出近似的估计并且反演算法对不同误差水平具有相对稳定性.
The scattering of elastic waves by spherical particles with non-intact bonding interface and the multiple scattering of elastic waves in composites with spherical particles were investigated.First, the problem of elastic wave scattering of single spherical particles was studied under the spring model.And then, In the statistical mean, the calculation formulas of effective wave and effective wave velocity and attenuation in composite materials with randomly distributed particles are studied.According to the dependence of effective wave velocity and attenuation on interface constant, the effects of interface damage on effective wave velocity Based on which the method of non-destructive estimation of interface damage based on ultrasonic measurement data is proposed.Numerical simulation of Sic-Al composites is carried out.The effective wave velocity and And the genetic algorithm was used to inversely calculate the synthetic experimental data with different error levels on the interface damage.The numerical results show that the inverse calculation of the synthetic experimental data with random errors can approximate the damage degree of the interface and the inverse The algorithm has relative stability to different error levels.