Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 78, Issue -, Pages 424-435Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2015.07.006
Keywords
Delamination; Mechanical properties; Finite element analysis (FEA); Z-pinning
Funding
- Rolls-Royce plc through the Composites University Technology Centre (UTC) at the University of Bristol, UK
- Engineering and Physical Sciences Research Council [EP/M014800/1] Funding Source: researchfish
- EPSRC [EP/M014800/1] Funding Source: UKRI
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This paper presents a three-dimensional micro-mechanical finite element (FE) modelling strategy for predicting the mixed-mode response of single Z-pins inserted in a composite laminate. The modelling approach is based upon a versatile ply-level mesh, which takes into account the significant micro-mechanical features of Z-pinned laminates. The effect of post-cure cool down is also considered in the approach. The Z-pin/laminate interface is modelled by cohesive elements and frictional contact. The progressive failure of the Z-pin is simulated considering shear-driven internal splitting, accounted for using cohesive elements, and tensile fibre failure, modelled using the Weibull's criterion. The simulation strategy is calibrated and validated via experimental tests performed on single carbon/BMI Z-pins inserted in quasi-isotropic laminate. The effects of the bonding and friction at the Z-pin/laminate interface and the internal Z-pin splitting are discussed. The primary aim is to develop a robust numerical tool and guidelines for designing Z-pins with optimal bridging behaviour. (C) 2015 Elsevier Ltd. All rights reserved.
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