Imperial College London
Alternate

ProfessorSilvestrePinho

Faculty of Engineering, Department of Aeronautics

Professor in the Mechanics of Composites
 
 
 
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Contact

 

+44 (0)20 7594 5076silvestre.pinho Website

 
 
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Location

 

314City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Bullegas:2020:10.1016/j.engfracmech.2020.106920,
author = {Bullegas, G and Moledo, Lamela J and Pimenta, S and Pinho, ST},
doi = {10.1016/j.engfracmech.2020.106920},
journal = {Engineering Fracture Mechanics},
pages = {1--31},
title = {On the role of dynamic stress concentrations and fracture mechanics in the longitudinal tensile failure of fibre-reinforced composites},
url = {http://dx.doi.org/10.1016/j.engfracmech.2020.106920},
volume = {228},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - This paper investigates the role of dynamic stress concentrations, and of fracture mechanics-driven growth of critical clusters of fibres, on the longitudinal tensile failure of fibre-reinforced composites. For this purpose, we developed a semi-analytical fibre bundle model to simulate the longitudinal tensile failure of large composite bundles of continuous fibres. The model uses shear-lag to calculate the stress recovery along broken fibres, and an efficient field superposition method to calculate the stress concentration on the intact fibres, which has been validated against analytical and Finite Element (FE) results from the literature.The baseline version of the model uses static equilibrium stress states, and considers fibre failure driven by strength of materials (stress overload) as the only damage theory which can drive bundle failure. Like other models in the literature, the baseline model fails to capture the correct size effect (decreasing composite strength with bundle size) shown by experimental results.Two model variants have been developed which include dynamics stress concentrations and a fracture mechanics failure criterion respectively. To the knowledge of the authors, it is the first attempt in the literature to investigate these two effects in a fibre bundle model by direct simulation of large composite bundles. It is shown that, although the dynamic stress concentration significantly decreases the predicted bundle strength, it does not allow to predict the correct trend of the size effect. Finally, the results suggest that fracture mechanics may be the physical mechanism which is necessary to include to correctly predict the decreasing composite strength with bundle size shown by experimental results.
AU  - Bullegas,G
AU  - Moledo,Lamela J
AU  - Pimenta,S
AU  - Pinho,ST
DO  - 10.1016/j.engfracmech.2020.106920
EP  - 31
PY  - 2020///
SN  - 0013-7944
SP  - 1
TI  - On the role of dynamic stress concentrations and fracture mechanics in the longitudinal tensile failure of fibre-reinforced composites
T2  - Engineering Fracture Mechanics
UR  - http://dx.doi.org/10.1016/j.engfracmech.2020.106920
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000517397300027&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://www.sciencedirect.com/science/article/pii/S0013794419312408?via%3Dihub
UR  - http://hdl.handle.net/10044/1/77590
VL  - 228
ER  -
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