The influence of strain rate on the interfacial fracture toughness between PVB and laminated glass
The influence of strain rate on the interfacial fracture toughness between PVB and laminated glass
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DOI：
10.1051/jp4:2006134176
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发表时间：
2006-08
期刊：
影响因子：
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通讯作者：
R. Iwasaki;C. Sato
中科院分区：
文献类型：
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作者：
R. Iwasaki;C. Sato
本文介绍了使用夹层安全玻璃进行高速测试的实验结果，以确定 PVB（聚乙烯醇缩丁醛）片材和玻璃板之间的界面断裂韧性。首先对PVB进行低速拉伸试验。 PVB表现出非线性粘弹性。使用非线性粘弹性模型描述该特性。计算粘弹性参数，以将实验获得的应力-应变曲线与模拟结果进行比较。我们建立了 PVB 夹层玻璃的简单断裂力学模型来确定能量释放率 G。PVB 夹层玻璃样品的断裂韧性 G c 由低速拉伸试验结果和能量释放率方程计算得出。 PVB在高应变速率下的应变-应力曲线与低速试验完全不同。这种现象可以通过应变率差异引起的相变来解释，因为 PVB 的机械性能从粘弹性变为玻璃态。 PVB夹层玻璃的断裂韧性是根据高速试验的实验结果计算得出的。定义断裂能并与断裂韧性进行比较。
This paper presents the experimental results of high speed tests using laminated safety glass to determine the interfacial fracture toughness between PVB (polyvinyl butyral) sheets and glass plates. Low-speed tensile test of PVB was carried out firstly. PVB shows a non-linear visco-elastic property. The property was described using a non-linear visco-elastic model. The visco-elastic parameters were calculated to compare the experimentally obtained stress-strain curves and the results of simulation. A simple fracture-mechanical model for PVB laminated glass was conducted to determine the energy release rate G. The fracture toughness G c of the PVB laminated glass specimens were calculated from both the results of low-speed tensile tests and the equation for the energy release rate. The strain-stress curves of PVB under high strain rates are totally different from those of the low speed tests. The phenomenon can be explained from the phase transition due to the difference of strain rates because the mechanical properties of PVB changes from visco-elastic to glassy behavior. The fracture toughness of PVB laminated glass was calculated from the experimental results of high speed tests. Fracture energy was defined and also compared to the fracture toughness.