A novel model of delamination bridging via Z-pins in composite laminates

被引:50
作者
Allegri, G. [1 ]
Yasaee, M. [1 ]
Partridge, I. K. [1 ]
Hallett, S. R. [1 ]
机构
[1] Univ Bristol, Adv Composites Ctr Innovat & Sci, Bristol BS8 1TR, Avon, England
关键词
Composite materials; Fibre reinforced; Delamination; Toughness; MECHANISMS; TOUGHNESS; FRACTURE; STRENGTH;
D O I
10.1016/j.ijsolstr.2014.05.017
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
A new micro-mechanical model is proposed for describing the bridging actions exerted by throughthickness reinforcement on delaminations in prepreg based composite materials, subjected to a mixedmode (I-II) loading regime. The model applies to micro-fasteners in the form of brittle fibrous rods (Z-pins) inserted in the through-thickness direction of composite laminates. These are described as Euler-Bernoulli beams inserted in an elastic foundation that represents the embedding composite laminate. Equilibrium equations that relate the delamination opening/sliding displacements to the bridging forces exerted by the Z-pins on the interlaminar crack edges are derived. The Z-pin failure meso-mechanics is explained in terms of the laminate architecture and the delamination mode. The apparent fracture toughness of Z-pinned laminates is obtained from as energy dissipated by the pull out of the throughthickness reinforcement, normalised with respect to a reference area. The model is validated by means of experimental data obtained for single carbon/BMI Z-pins inserted in a quasi-isotropic laminate. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:3314 / 3332
页数:19
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