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Thermoplastic polyurethane/glass fabric composite laminates: Low velocity impact behavior under extreme temperature conditions

机译：热塑性聚氨酯/玻璃纤维复合层压板：在极端温度条件下的低速冲击性能

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摘要

This paper reports the low velocity impact behavior of thermoplastic laminated structures based on thermoplastic polyurethane reinforced with woven glass fiber highlighting effects related to sample thickness and test temperature with the aim to verify their potential applications. Plaques obtained by film stacking and compression molding technologies are tested using an instrumented falling dart machine at room temperature, 25 degrees C and 50 degrees C. Impact results are reported in terms of typical load-deflection and energy-time curves, but also discussed with reference to the well known ductility index (DI) parameter. As expected, the cooling is reflected in an increased stiffness of tested specimens and their higher propensity to the damage. Increases of plate thickness and reductions of the test temperature lead to enhanced friction phenomena at the material-dart contact, responsible of significant deviations from well established semi-empirical models about the Hertz contact force and the penetration energy.
机译：本文报道了基于热塑性聚氨酯的热塑性层压结构的低速冲击性能，该热塑性聚氨酯用玻璃纤维编织物增强了与样品厚度和测试温度有关的突出效果，旨在验证其潜在的应用前景。通过薄膜堆叠和压塑技术获得的斑块在室温，25摄氏度和50摄氏度下使用仪器化的落镖机进行测试。冲击结果以典型的载荷-挠度和能量-时间曲线表示，但也讨论了参考众所周知的延展性指数（DI）参数。如预期的那样，冷却表现为被测样品的刚度增加以及它们对损伤的倾向更高。板厚度的增加和测试温度的降低会导致材料-飞镖接触处的摩擦现象增强，这可能导致与已建立的关于赫兹接触力和穿透能的半经验模型存在显着偏差。

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