Imperial College London
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ProfessorMariaCharalambides

Faculty of Engineering, Department of Mechanical Engineering

Professor of the Mechanics of Materials
 
 
 
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Contact

 

+44 (0)20 7594 7246m.charalambides Website

 
 
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Location

 

516City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Iqbal:2022:10.1007/s11340-022-00895-x,
author = {Iqbal, M and Zhang, R and Ryan, P and Lewis, D and Connors, S and Charalambides, M},
doi = {10.1007/s11340-022-00895-x},
journal = {Experimental Mechanics},
pages = {97--113},
title = {Mechanical characterisation and cohesive law calibration for a nitrocellulose based - cyclotetramethylene tetranitramine (HMX) polymer bonded explosive},
url = {http://dx.doi.org/10.1007/s11340-022-00895-x},
volume = {63},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Background: Mechanical characterisation of polymer bonded explosives (PBXs) is crucial for their safe handling during storage and transportation. At temperatures higher than the binder's glass transition temperature, fracture is caused predominantly by interface debonding between the binder and explosive crystals. Interfacial friction between debonded crystals can lead to accidental detonation of the PBX material, even under a very small external load. Cohesive zone laws can describe this interfacial debonding. Objective: This study aims to experimentally calibrate the interfacial cohesive zone parameters of a nitrocellulose based - cyclotetramethylene tetranitramine (HMX) PBX, a particulate composite with a 88% volume fraction of crystals. Methods:  Compact tension fracture tests, coupled with Digital Image Correlation (DIC) were used to capture the strain fields around the crack tip. The experimental data were used in conjunction with an extended Mori-Tanaka method considering the effect of interfacial debonding. Results: The cohesive zone parameters were successfully calibrated and were found to be crosshead rate independent. The values of the critical traction σ_int^max and interfacial energy release rate, γ_if, dropped significantly with increasing temperature. The experimental method followed in this study is generic, and it can be employed to extract the cohesive zone parameters characterising the interface behaviour between the filler and matrix in other particulate filled, polymer composite materials.  Conclusions: Cohesive zone properties can be experimentally determined to provide inputs in micromechanical simulations linking the microstructure of the PBX composite to its macroscopic response as well as enabling the estimation of hot spot formation at debonded crystal interfaces.
AU  - Iqbal,M
AU  - Zhang,R
AU  - Ryan,P
AU  - Lewis,D
AU  - Connors,S
AU  - Charalambides,M
DO  - 10.1007/s11340-022-00895-x
EP  - 113
PY  - 2022///
SN  - 0014-4851
SP  - 97
TI  - Mechanical characterisation and cohesive law calibration for a nitrocellulose based - cyclotetramethylene tetranitramine (HMX) polymer bonded explosive
T2  - Experimental Mechanics
UR  - http://dx.doi.org/10.1007/s11340-022-00895-x
UR  - https://link.springer.com/article/10.1007/s11340-022-00895-x
UR  - http://hdl.handle.net/10044/1/99078
VL  - 63
ER  -
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