Imperial College London
Alternate

DrGiulianoAllegri

Faculty of Engineering, Department of Aeronautics

Honorary Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 5086g.allegri

 
 
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Location

 

212City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Allegri:2014:10.1016/j.ijsolstr.2014.05.017,
author = {Allegri, G and Yasaee, M and Partridge, IK and Hallett, SR},
doi = {10.1016/j.ijsolstr.2014.05.017},
journal = {International Journal of Solids and Structures},
pages = {3314--3332},
title = {A novel model of delamination bridging via Z-pins in composite laminates},
url = {http://dx.doi.org/10.1016/j.ijsolstr.2014.05.017},
volume = {51},
year = {2014}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - A new micro-mechanical model is proposed for describing the bridging actions exerted by through-thickness reinforcement on delaminations in prepreg based composite materials, subjected to a mixed-mode (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 through-thickness 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. © 2014 Elsevier Ltd. All rights reserved.
AU  - Allegri,G
AU  - Yasaee,M
AU  - Partridge,IK
AU  - Hallett,SR
DO  - 10.1016/j.ijsolstr.2014.05.017
EP  - 3332
PY  - 2014///
SN  - 1879-2146
SP  - 3314
TI  - A novel model of delamination bridging via Z-pins in composite laminates
T2  - International Journal of Solids and Structures
UR  - http://dx.doi.org/10.1016/j.ijsolstr.2014.05.017
UR  - http://hdl.handle.net/10044/1/26833
VL  - 51
ER  -
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