The Out-of-Plane Compression Response of Woven Thermoplastic Composites: Effects of Strain Rates and Temperature.
The Out-of-Plane Compression Response of Woven Thermoplastic Composites: Effects of Strain Rates and Temperature.
复制标题
编织热塑性复合材料的面外压缩响应：应变率和温度的影响
DOI：
10.3390/polym13020264
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发表时间：
2021-01-14
期刊：
影响因子：
5
通讯作者：
Liang J
中科院分区：
文献类型：
--
作者：
Wang S;Wen L;Xiao J;Lei M;Hou X;Liang J
高性能热塑性复合材料在宽应变率范围内的动态力学响应是航空航天工程领域极端环境生存性的一个具有挑战性的研究课题。本文研究了机织热塑性复合材料在高温下的动态性能随应变速率和损伤过程的演变。采用分离式霍普金森压杆（SHPB）对玻璃纤维（GF）和碳纤维（CF）增强聚苯硫醚（PPS）复合材料进行了面外动态压缩试验。结果表明，热塑性复合材料具有应变率强化效应和高温弱化效应。GF/PPS和CF/PPS复合材料在低于阈值应变率时具有相同的应变率敏感性。基体在高温下的软化降低了模量，但对强度影响不大。提出了考虑应变率和温度效应的热塑性复合材料离面动态压缩行为的经验公式。最后，通过扫描电子显微镜（SEM）检查试样的最终失效，以探索潜在的失效机制，如在高应变速率下的纤维束剪切断裂和在高温下的拉伸断裂。
The dynamic mechanical response of high-performance thermoplastic composites over a wide range of strain rates is a challenging research topic for extreme environmental survivability in the field of aerospace engineering. This paper investigates the evolution of the dynamic properties of woven thermoplastic composites with strain rate and damage process at elevated temperatures. Out-of-plane dynamic-compression tests of glass-fiber (GF)- and carbon-fiber (CF)-reinforced polyphenylene sulfide (PPS) composites were performed using a split Hopkinson pressure bar (SHPB). Results showed that thermoplastic composites possess strain-rate strengthening effects and high-temperature weakening dependence. GF/PPS and CF/PPS composites had the same strain-rate sensitivity (SRS) below the threshold strain rate. The softening of the matrix at elevated temperatures decreased the modulus but had little effect on strength. Some empirical formulations, including strain-rate and temperature effects, are proposed for more accurately predicting the out-of-plane dynamic-compression behavior of thermoplastic composites. Lastly, the final failure of the specimens was examined by scanning electron microscopy (SEM) to explore potential failure mechanisms, such as fiber-bundle shear fracture at high strain rates and stretch break at elevated temperatures.
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