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{Skamniotis:2019:10.1016/j.ijplas.2018.10.001,
author = {Skamniotis, CG and Elliott, M and Charalambides, MN},
doi = {10.1016/j.ijplas.2018.10.001},
journal = {International Journal of Plasticity},
pages = {40--62},
title = {On modelling the constitutive and damage behaviour of highly non-linear bio-composites - Mesh sensitivity of the viscoplastic-damage law computations},
url = {http://dx.doi.org/10.1016/j.ijplas.2018.10.001},
volume = {114},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The large strain fracture of non-linear complex solids concerns a wide range of applications, such as material forming, food oral processing, surgical instrumental penetration as well as more recently, the design of biodegradable composites for packaging and bio-medical use. Although simulations are a powerful tool towards understanding and designing such processes, modelling ductile fracture in materials such as soft natural composites imposes a new challenge, particularly when the fracture patterns cannot be pre-defined. Here we bring to light new information on these aspects of benefit to the multidisciplinary community, by characterising and modelling the deformation and fracture of short cellulose fibre starch extruded composites. Hyperviscoelastic-Mullins damage laws show merits in modelling such complex systems. Yet they are inferior to a viscoplastic-damage law able to capture exactly their highly non-linear, rate dependent and pressure dependent pseudo-plastic stress-strain response. The viscoplastic-damage law also predicts fracture based on experimental toughness values without pre-specifying the crack path in a Finite Element (FE) model, displaying superiority over the conventional cohesive zone approach. Yet, despite using a toughness parameter to drive crack propagation, spurious mesh dependency is still observed while other previously unreported sources of error imposed by the finite element aspect ratio are also highlighted. The latter is rectified by developing a novel numerical strategy for calculating the characteristic element length used in the damage computations. Inherent mesh dependency suggests that non-local damage models may be essential to model this newly investigated class of natural composites.
AU  - Skamniotis,CG
AU  - Elliott,M
AU  - Charalambides,MN
DO  - 10.1016/j.ijplas.2018.10.001
EP  - 62
PY  - 2019///
SN  - 0749-6419
SP  - 40
TI  - On modelling the constitutive and damage behaviour of highly non-linear bio-composites - Mesh sensitivity of the viscoplastic-damage law computations
T2  - International Journal of Plasticity
UR  - http://dx.doi.org/10.1016/j.ijplas.2018.10.001
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000460718900003&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/68302
VL  - 114
ER  -
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