Abstract Damage onset and adiabatic heating of a pultruded Glass Fiber-Reinforced Plastic (GFRP) composite was investigated using compression tests at low, intermediate and high strain rates (10−3 s−1, 1 s−1 and 103 s−1). Optical and infrared (IR) cameras monitored the specimens during testing, so that the mechanical response, damage onset, and damage evolution were obtained along with the adiabatic heating of the specimen due to plastic deformation and fracture. The results revealed clear strain rate effects on stiffness, strain softening and damage initiation. The simultaneous optical and IR imaging allowed quantitative description of thermomechanical response of the material and studying the formation and propagation of shear localizations and their temperature history. The maximum temperatures in the fracture zones exceed 80 °C at the strain rate of 103 s−1. Scanning Electron Microscopy (SEM) was used to identify the micro-scale crack paths at different strain rates. The findings allow more exact numerical predictions and design of tubular GFRP pipes for impact applications.

中文翻译：

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不同应变率下压缩载荷下拉挤玻璃纤维增​​强复合材料的绝热加热和损伤开始

摘要 使用低、中和高应变率（10-3 s-1、1 s-1 和 103 s-1）的压缩试验研究了拉挤玻璃纤维增​​强塑料 (GFRP) 复合材料的损伤开始和绝热加热。光学和红外 (IR) 摄像机在测试过程中对试样进行监测，从而获得机械响应、损伤开始和损伤演变以及由于塑性变形和断裂引起的试样绝热加热。结果表明，应变率对刚度、应变软化和损伤起始有明显的影响。同时进行的光学和红外成像可以定量描述材料的热机械响应，并研究剪切局部化及其温度历史的形成和传播。在应变速率为 103 s-1 时，断裂带的最高温度超过 80 °C。扫描电子显微镜 (SEM) 用于识别不同应变率下的微尺度裂纹路径。这些发现允许对用于冲击应用的管状 GFRP 管进行更精确的数值预测和设计。