Experimental and theoretical studies on inter-fiber failure of unidirectional polymer-matrix composites under different strain rates

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:113

Article

Tao, Yong¹  Chen, Haosen²  Yao, Kai^1,3  Lei, Hongshuai¹  Pei, Yongmao¹  Fang, Daining^1,2 

[1] Peking Univ, Coll Engn, State Key Lab Turbulence & Complex Syst, Beijing 100871, Peoples R China

[2] Beijing Inst Technol, Inst Adv Struct Technol, State Key Lab Explos Sci & Technol, Beijing 100081, Peoples R China

[3] Beijing Jiaotong Univ, Sch Civil Engn, Dept Mech, Beijing 100044, Peoples R China

关键词: Polymer-matrix composites;    Strain rate effect;    Strength;    Failure theory;   

DOI  :  10.1016/j.ijsolstr.2016.11.014

来源: Elsevier

【 摘 要 】

Polymer-matrix composites (PMCs) are widely used in many fields. However, the accurate characterization of their failure behavior is still a challenge. At present, the inter-fiber failure of unidirectional PMCs under compression is not well predicted, and the corresponding strain rate dependent failure theory remains less explored. This paper aims to study and characterize the inter-fiber failure behavior of unidirectional PMCs under different strain rates. Unidirectional glass/epoxy specimens with various off-axis angles were tested at three strain rates (quasi-static, 383 and 646 s(-1)), and the measured strain rate dependent strength is modelled by an empirical formula. To evaluate the test results, a new failure theory that incorporates strain rate effects is proposed. The theory is developed based on three different failure modes, with each represented by a new and simple formula. Comparison shows that the predicted failure envelopes and fracture angles are in excellent agreement with the experimental results. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

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