爆炸载荷作用下夹层玻璃动态响应的数值模拟

为研究爆炸载荷作用下夹层玻璃的动态响应，利用有限元软件LS-DYNA对爆炸载荷作用下夹层玻璃的动态响应进行了数值模拟。通过改变外层玻璃与内层玻璃的厚度，系统地研究不同组合下夹层玻璃的动态响应规律，描述爆炸产物与结构相互作用过程，分析夹层玻璃不同部分的能量吸收效率，观察夹层玻璃的裂纹扩展过程。结果表明：玻璃厚度的改变对结构动态响应有明显影响，随着爆炸距离增加，影响程度逐渐减小；爆炸产物先于空气冲击波对玻璃的冲击有损伤破坏作用；结构外层玻璃的能量吸收效率最大，聚乙烯醇缩丁醛胶层次之，内层玻璃吸收效率最小；爆炸载荷下夹层玻璃的裂纹以环向裂纹为主，径向裂纹相对较少。

Numerical Simulation of Dynamic Response of Laminated Glass Subjected to Blast Load

The dynamic response of laminated glass subjected to blast load is simulated using LS-DYNA finite element software in order to study the dynamic response of laminated glass under explosive loading. The rules in dynamic response of laminated glass are studied systematically by changing the thicknesses of the external and internal glasses without change of total thickness, the interaction between explosion pro- ducts is presented, the energy absorption efficiencies of different parts of the laminated glass are analyzed, and the crack propagation process is also observed. The results indicate that the variation of glass thickness has a clear effect on the dynamic response of structure at shorter explosive distance, and the influence, however, is slight with increase in explosive distance. Explosion products damage the glass before air shock wave does. The external glass has the maximum energy absorption efficiency, the PVB glue layer has the less, and the internal glass has the least. Under blast load, the laminated glass has most circumferential cracks and relatively few radial cracks on it.