Compound model of residual stiffness degradation for FRP composites

被引：0

作者：

Zong J. ^{[1
]}

Yao W. ^{[2
]}

机构：

[1] Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle, Nanjing University of Aeronautics and Astronautics, Nanjing

[2] State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing

来源：

Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2016年 / 33卷 / 02期

关键词：

Composites; Failure modes; Fatigue; Laminate; Residual stiffness;

D O I：

10.13801/j.cnki.fhclxb.20150522.002

中图分类号：

学科分类号：

摘要：

In order to establish the relationship between residual stiffness, material damage quantity and residual life, failure modes of fiber-reinforced polymer (FRP) laminates under tension-tension fatigue load effect are divided into three types: inter fiber fracture, fiber random fracture and delamination. Based on the analysis of quantitative relationship between different failure modes and residual stiffness degradation quantity, a compound model of residual stiffness degradation, integrated each failure mode's influence, was put forward. This model is applicable to stage I and II, which occupy most of the life, avoids the influence of stiffness reduction uncertainty in stage III. Normalization of residual stiffness degradation curve by time scale, eliminates individual specimens' dispersion effect, significantly reduces the dispersion. Statistical analysis was conducted for fatigue test results of four kinds of E-glass/Epoxy glass fiber composite laminates and three kinds of AS-4/polyether-ether-ketone (PEEK) carbon fiber composite laminates, which shows that the proposed model is suitable for an accurate description of the residual stiffness decline law of composites. © 2016, BUAA Culture Media Group Ltd. All right reserved.

引用

页码：280 / 286

页数：6

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