PVB夹层玻璃的失效扩展

Failure Extension in PVB Laminated Glass

本文为探讨聚乙烯醇缩丁醛(PVB)夹层玻璃断裂失效的扩展规律,运用ANSYS/LSDYNA软件对夹层玻璃在聚能射流冲击作用下的变化进行了仿真研究,分析了玻璃厚度对断裂破坏效果及PVB薄膜厚度对失效扩展特性的影响。结果表明:冲击作用下玻璃厚度对夹层玻璃断裂破坏的影响较平缓。随着PVB薄膜厚度的增加,玻璃试件的失效扩展特性(速度、起始加速度、后期减速度和稳定加速度)减小,其吸能特性增强,断裂失效的扩展过程趋于平缓。并从理论方面判定夹层玻璃在冲击过程中的失效扩展速度主要取决于应力分量,且PVB粘弹性层具有较强的吸能作用。

In order to discuss the extension rule of rupture failure in PVB（POLYVINYL BUTYRAL） laminated glass, the software of ANSYS/LS-DYNA was employed to investigate the change situations of laminated glass under the impact of shaped charge jet. The effect of glass thickness on rupture damage and the effect of PVB film thickness on failure extension characteristics were analyzed. It was shown that glass thickness has little rupture damage effect on the laminated glass under the impact action. With the increase of PVB film thickness, failure extension characteristics （velocity, initial acceleration, late deceleration, and stable acceleration） of glass specimen are decreased, but energy-absorbing characteristic is enhanced, and rupture failure extension process becomes flat. Furthermore, in terms of theoretical analysis, result suggests that failure extension velocity of laminated glass in the impact process mainly depends on the stress component. Moreover, the stronger energy absorption effect can be found in PVB viscoelastic layer.