激波管聚酯膜片变形过程分析

使用聚酯薄膜作为激波管膜片，通过施加不同压力的激波管实验，获得了膜片厚度及多张膜片的组合方式对膜片所能承受最大压力的影响。利用高速相机对激波管膜片从开始变形到破坏的全过程进行拍摄，使用三维DIC软件获得膜片在变形过程中的位移场。实验发现了膜片会出现圆弧反翘并快速破坏的特别现象，并以此为特征将变形过程分为2个阶段。给出任意厚度膜片第1阶段圆弧变形的数学规律及第2阶段圆弧反翘的形状特征，以及全过程中膜片厚度变化的数学规律。

Analysis on the deformation process of PET shock tube diaphragm

In order to investigate the effect of diaphragms thickness and combination on the maximum bearing pressure, the shock tube experiment was conducted on the PET diaphragms with different thicknesses. Two high-speed cameras were used to capture and record the whole deformation process of the PET diaphragms. The diaphragms displacement field at different moments were obtained by 3D-DIC. An unusual interesting phenomenon was observed that the diaphragms were recurved and then dramatically ruptured, and thus the diaphragm defamation was divided into two stages. The diaphragms deformation of any thickness in the first stage, and the shape characteristic of the diaphragm recurvation in the second stage as well as the thickness variation during the whole process were analyzed.