Imperial College London
Alternate

John P. Dear FREng

Faculty of Engineering, Department of Mechanical Engineering

Professor of Mechanical Engineering
 
 
 
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Contact

 

j.dear Website

 
 
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Location

 

520City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Irven:2022:10.1016/j.polymer.2022.125420,
author = {Irven, G and Carolan, D and Fergusson, A and Dear, JP},
doi = {10.1016/j.polymer.2022.125420},
journal = {Polymer},
pages = {1--13},
title = {Fracture performance of epoxy foam: Low density to bulk polymer},
url = {http://dx.doi.org/10.1016/j.polymer.2022.125420},
volume = {261},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Epoxy foams with densities ranging from 180 to 500 kg/m3 were prepared and mechanically tested incompression, tension, and single-edge notched bending (SENB) configurations. Fracture results revealed amarked transition in behaviour at a critical density, between 227 kg/m3 and 249 kg/m3. Lower density foamsfailed at low SENB displacement, producing low toughness and fracture energy results, whereas higher densityfoams failed at higher SENB displacements, with correspondingly higher values of toughness and fracture energy.The stress-intensity factor increased monotonically with density, from 0.1 to 0.79 MPa m1/2. The fracture energy,GIc, of the foams reached values of up to 3.5 times that of the bulk polymer, 268 J/m2. Lower density foamsbelow the transition in fracture behaviour exhibited a small number of large cells, caused by cell coalescence, anda wider cell size distribution than the denser foams. This distribution appears linked to the transition in fracturebehaviour. The behaviour revealed in this paper raises the point whether in future design criteria, where foamsare now often used in composite sandwich structures, allowance should be made for denser foams to be used asappreciable increases in fracture energy of the foam core are achievable.
AU  - Irven,G
AU  - Carolan,D
AU  - Fergusson,A
AU  - Dear,JP
DO  - 10.1016/j.polymer.2022.125420
EP  - 13
PY  - 2022///
SN  - 0032-3861
SP  - 1
TI  - Fracture performance of epoxy foam: Low density to bulk polymer
T2  - Polymer
UR  - http://dx.doi.org/10.1016/j.polymer.2022.125420
UR  - https://www.sciencedirect.com/science/article/pii/S0032386122009089?via%3Dihub
UR  - http://hdl.handle.net/10044/1/100479
VL  - 261
ER  -
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