【作者】 陈建军； 章德；

【Author】 CHEN Jian-jun;ZHANG De;The Institute of Acoustics,Key Laboratory of Modern Acoustics,Nanjing University;

【机构】 南京大学声学研究所,近代声学教育部重点实验室；

【摘要】 随着现代工业的发展,多层复合材料的使用也越来越广泛。多层复合材料在粘接的时候或者使用了一段时间后,层与层之间的粘接界面会出现粘接力不对称的现象,可能导致材料断裂,这就为多层复合材料的安全使用埋下隐患。本文采用接触声非线性方法理论研究了纵波在粘接力不对称界面的反射和透射,计算表明透射声波产生畸变,含有大量的谐波成分。频谱分析发现三次谐波对界面不对称应力变化最敏感。因此我们可以通过检测透射波中三次谐波的变化来评价界面应力的分布情况。更多还原

【Abstract】 Due to the development of the modern industry,the multilayered composite materials are widely used.When the composite materials are formed by bonding the layers together or after they have been used for a period of time,asymmetric adhesion will appear in the interface which will possibly cause the composite materials to break.In this paper,the contact acoustic nonlinearity method is used to study the reflection and transmission of a longitudinal wave at the asymmetric adhesion interface.According to the calculation,the transmitted wave is distorted.After FFT,the third harmonic wave is the most sensitive to the change of the asymmetric stress.So the third harmonic wave can be used to evaluate the distribution of the stress at the interface.更多还原