Characterising mode I/mode II fatigue delamination growth in unidirectional fibre reinforced polymer laminates

被引:68
作者
Al-Khudairi, O. [1 ]
Hadavinia, H. [1 ]
Waggott, A. [2 ]
Lewis, E. [1 ]
Little, C. [2 ]
机构
[1] Kingston Univ London, Sch Mech & Automot Engn, London, England
[2] Natl Renewable Energy Ctr NaREC, Blyth, Northumberland, England
关键词
Fatigue; Composite laminate; Delamination; Fractography; INTERLAMINAR FRACTURE-TOUGHNESS; CRACK PROPAGATION; COMPOSITE; LIFE; JOINTS; LENGTH;
D O I
10.1016/j.matdes.2014.10.038
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this paper, fatigue life estimation for delamination growth of laminated fibre reinforced polymer (FRP) composite structures in mode I and mode II based on fracture mechanics is presented. The proposed method was applied to delamination of glass/epoxy laminated composite. Both the threshold energy release rate (G(th)) and the delamination propagation based on Paris' law were studied. The double cantilever beam (DCB) specimen for mode I and 3 points End-Notched Flexure (3ENF) specimen for mode II were used for monotonic fracture tests and the resistance G(IR) and G(IIR) as a function of delamination length were determined. For DCB tests, the fatigue onset life test was conducted and the threshold energy release rate, G(Ith), was found for the subcritical region. Constant amplitude, displacement controlled cyclic fatigue test for both modes was conducted and the delamination crack growth rate (da/dN) as a function of maximum cyclic energy release rate G(Imax) and G(IImax) for DCB and 3ENF specimens were determined, respectively. From curve fitting to the experimental data, the Paris' law material constants C and m for mode I and mode II were obtained. Finally, the SEM fractography studies of delaminated surfaces of 3ENF static and fatigued specimens have been done and the different features observed on these surfaces were discussed. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:93 / 102
页数:10
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