简谐P波透过摩擦接触界面的实验分析

工程结构中存在着大量的接触界面,接触界面只能承压不能承拉。含有接触界面的材料或结构受地震、冲击等动荷载作用时,可能引起界面的局部分离和滑移,从而导致问题的非线性。对简谐P波垂直入射接触界面问题进行了实验研究。观测分析透射波时域波形和频域曲线的变化,给出了透射波高阶频率幅值随外加荷载的变化规律,以期为无损探测材料接触型缺陷以及定量测定界面接触力提供参考。

Experimental Study on Propagation of Harmonic P Waves through a Contact Interface

There are a lot of contact interfaces in engineering structures that can only hold pressure but not tension. When materials or structures are subjected to dynamic loads such as earthquake loads or impact loads, the localized separation or slip of a contact interface may take place which makes the problem non-linear. The problem of a P wave incident vertically upon the contact interface has been experimentally studied. The change of frequency-domain curves and time-domain waveforms has been observed and analyzed, The variation of the amplitude of the refracted higher harmonics with the applied loads is explored. The results may offer some references for nondestructively detecting flaws of materials and quantitatively measuring contact force of interfaces.