An energy-equivalent bridging map formulation for modelling delamination in through-thickness reinforced composite laminates

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:202

Article

Melro, Antonio R.¹  Serra, Joel¹  Allegri, Giuliano¹  Hallett, Stephen R.¹ 

[1] Univ Bristol, Bristol Composites Inst ACCIS, Queens Bldg, Bristol BS8 1TR, Avon, England

关键词: Through-thickness reinforcement (TTR);    Damage tolerance;    Cohesive models;    Delamination;    Finite element analysis;   

DOI  :  10.1016/j.ijsolstr.2020.06.018

来源: Elsevier

【 摘 要 】

A new multi-scale framework to numerically model the bridging effect in through-thickness reinforced (TTR) composite laminates with z-pins is presented. The framework first establishes a library of bridging maps, calculated by a micromechanical semi-analytical constitutive bridging model. For the macro-scale, a tri-linear cohesive law has been developed to model initiation and propagation of the interfacial damage in the presence of z-pins. The cohesive law takes into account the energy dissipated by delamination propagation through the matrix in the interlaminar region, plus the energy contributed by the z-pin bridging up to complete pull-out from the laminate or z-pin failure. The information regarding the failure mode and the consequent dissipated energy comes from the library of bridging maps. The tri-linear cohesive law has been implemented in a user material subroutine of a commercial finite element software. The framework has been validated against experimental data and an excellent correlation has been achieved. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

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