杆中嵌入薄板的应力波传播行为

STRESS WAVE PROPAGATION THROUGH A THIN PLATE SANDWICHED BETWEEN TWO BARS

采用一维理论分析和二维有限元模拟,研究了杆中嵌入薄板的应力波传播行为.首先根据一维弹性应力波理论,推导了反射波,透射波以及板中应力的表达式.结合算例,分析了薄板厚度对应力波传播的影响,然后采用有限元方法,验证了一维理论分析结果,同时也研究了不同界面处理方式对结果的影响.结果表明板越薄,对应力波传播的影响越小,薄板中应力越能真实地反映杆中的应力状态;在SHPB实验中,嵌入薄片/薄膜传感器测量微弱应力信号是可行的.

By one-dimensional theoretical analysis and： two-dimensional finite element simulation, the stress wave propagation through a thin plate sandwiched between two bars is investigated. Firstly, the ex- pressions of reflected and transmitted waves were derived by the theory of one-dimensional elastic stress wave. Then examples were used to analyze the influences of plate thickness on wave propagation. Secondly, finite element simulations were performed and the results agree with the one-dimensional analysis. Also, the influences of different plate-bar interactions on wave propagation were studied in the numerical simula- tions. The results show that..the thinner the plate is,the less the wave propagation is influenced; the thin- ner the plate is,the better the stress in plate agrees with the stress in the bars; and thin plate/film transducers can be used to measure weak stress signals in SHPB tests.