High strain-rate compression behavior of woven CF/PEEK thermoplastic composites at the glassy state and high-elastic state

被引:19
作者
Pan, Zhongxiang [1 ,2 ,4 ]
Yang, Chengcai [1 ]
Huang, Shuwei [3 ]
Wang, Mingling [2 ]
Wu, Zhenyu [2 ,4 ]
Gu, Bohong [3 ]
机构
[1] Zhejiang Sci Tech Univ, Coll Text Sci & Engn, Hangzhou 310018, Peoples R China
[2] Zhejiang Sci Tech Univ, Fac Mech Engn & Automat, Hangzhou 310018, Peoples R China
[3] Donghua Univ, Coll Text, Shanghai 201620, Peoples R China
[4] Zhejiang Sci Tech Univ, Hangzhou 310018, Peoples R China
关键词
Thermoplastic composites; High-speed photography; Temperature effect; Strain rate effect; MECHANICAL-PROPERTIES; SPECIMEN GEOMETRY; DAMAGE KINETICS; FIBER KINKING; FAILURE; TEMPERATURE;
D O I
10.1016/j.ijmecsci.2022.107740
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
A reliable hot air-flow heating approach is creatively carried out for high strain rate tests without environment tank. The out-of-plane and in-plane compression of carbon fiber reinforced polyetheretherketone (CF/PEEK) woven composites are investigated from 400 to 4000/s at the glassy state and high-elastic state. The real-time and in-situ deformation and failure process of the composite specimens under the extreme thermo-mechanical loads are successfully captured, which can reflect the impact dynamic behavior of the material near the ulti-mate service temperature. Empirical laws for mechanical index of the woven composites are given. The results reveal that the thermal softening effect outperforms the strain-rate strengthening effect. For out-of-plane impact at low strain rates, damage mode transitions from the interface and matrix cracking at glassy state to the "parallel" shear and fiber extrusion at high-elastic state. Under high strain rates, it reveals the "fragmented" shear mode at glassy state. For in-plane impact, the temperature effect leads to the failure mode changing from the delamination and local shear to the mixed feature of kinking bands, delamination, and multiple-band shear with "bulge" behavior. And the multiple-band shear and delamination are more likely to occur along the in-plane direction as the strain rate increased.
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页数:22
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