恒定加速度试验中陶瓷密封器件所受不良应力

Bad Stress on Ceramic Sealing Devices in Constant Acceleration Test

筛选试验的目的是选择具有一定特性的产品或剔除掉早期失效的产品,在恒定加速度试验中,常常因为试验设计不当、试验方法选择不当或试验夹具设计不当等因素,在试验过程中引入不良应力,导致器件损坏。针对此问题搭建恒定加速度仿真系统,结合有限元仿真分析方法,分别研究了三种常见的恒定加速度试验方法,即埋砂法、磁贴法和夹具法在试验过程中引入的不良应力的形式和危害性,分别指出了损伤机理。对较为恶劣的工况进行优化改进,优化后,不良应力明显下降,避免了夹具法试验对金锡焊料环的损伤。实验分析表明,在实际恒定加速度试验时,根据外壳尺寸特征选择合适的试验方法,可充分减小过程中引入的应力。

The purpose of screening test is to select products with certain characteristics or reject products with early failure. In constant acceleration test, bad stress is often introduced in the test process due to improper design of test, improper selection of test method or improper design of test fixture, which leads to device damage. In order to solve this problem, a constant acceleration simulation system is built.Combined with the finite element simulation analysis method, the forms and harmfulness of bad stress introduced by three common constant acceleration test methods, namely sand burying method, magnetic sticking method and fixture method, are studied, and the damage mechanism is pointed out respectively.The bad working conditions are optimized and improved. After optimization, the bad stress is obviously reduced without the damage of Au-Sn solder ring caused by fixture test. The experimental analysis shows that in the actual constant acceleration test, selecting the appropriate test method according to the size characteristics of the shell can fully reduce the stress introduced in the process.