恒应变速率超塑气胀成形试验系统的测控原理及实现

采用一种新颖的激光器＋光纤阵列＋光电池＋步进电机螺旋机构构成的非接触式位移测量装置，研制了一种新型计算机的控制恒应变速率超塑胀形试验系统，可以进行超塑胀形极限试验。研制表明，系统的机械、数据采集硬件接口以及软件的数据处理三部分的有机结合，可以以不太高的成本，研制出具较高性能的实用试验系统。

Design and Implement of a Constant Strain Rate Controlled Superplastic Bulging Tester

To cope with the requirements of the superplastic behavior of metal matrix composite materials for a better understanding under biaxial stretching, a brand new superplastic bulging tester controlled in a constant strain rate is deve loped with a non contact displacement measurement setup composed of a laser source, an optical fiber array, a photoelectric cell and a step motor driven screw mechanism. The depth of the deformed specimen so detected is then put into a target control function which yields the proper gas pressure for a constant strain rate controlled superplastic bulging. The superplastic bulging deformation can be carried out up to the fracture range. Reliable testing results and effective functioning of the tester come from a proper and balanced mix up of the mechanical design, hardware design of the data acquisition interface and software design of the data processing.