This paper aims to investigate the interlaminar shear properties and failure mechanisms of plain woven carbon fabric/polyetheretherketone (CF/PEEK) thermoplastic composites under high strain rate impact loads at different temperatures (25°C, 120°C, 295°C). A reliable hot air flow heating method with SHPB is creatively employed for short beam shear experiments. A multi-scale model was developed to predict the impact behavior of plain CF/PEEK composites. Both results show that the thermoplastic composites have strong strain rate and temperature dependence, and which are more sensitive to temperature effect. As the temperature increases, the thermoplastic composites are mainly affected by the softening effect of the matrix due to the glass transition temperature. The shear modulus and peak stress appear to decline at high temperatures, while the failure strain tends to increase. The damage mode changes from interlayer delamination cracking at the glassy state to shear fracture and fiber pullout at a highly elastic state. As the strain rate increases, the failure strain decreases, while the shear modulus and peak stress show the opposite trend. Fiber bundle breakage, debonding, matrix cracking, and significant interlayer delamination occur at high strain rates.

中文翻译：

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高温和应变速率对平纹编织 CF/PEEK 热塑性复合材料冲击诱导层间剪切行为的影响


本文旨在研究平纹碳布/聚醚醚酮（CF/PEEK）热塑性复合材料在不同温度（25°C、120°C、295°C）高应变率冲击载荷下的层间剪切性能和失效机制。创造性地采用SHPB可靠的热气流加热方法进行短梁剪切实验。开发了多尺度模型来预测普通 CF/PEEK 复合材料的冲击行为。这两个结果都表明热塑性复合材料具有很强的应变速率和温度依赖性，并且对温度效应更加敏感。随着温度升高，热塑性复合材料主要受到玻璃化转变温度引起的基体软化效应的影响。剪切模量和峰值应力在高温下似乎下降，而失效应变趋于增加。损伤模式从玻璃态的层间分层开裂转变为高弹性态的剪切断裂和纤维拔出。随着应变速率的增加，失效应变减小，而剪切模量和峰值应力则呈现相反的趋势。高应变率下会发生纤维束断裂、脱粘、基体开裂和显着的层间分层。