Imperial College London

Professor Nigel Brandon OBE FREng

Faculty of Engineering

Dean of the Faculty of Engineering
 
 
 
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Contact

 

+44 (0)20 7594 8600n.brandon Website

 
 
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Location

 

2.06Faculty BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Chen:2016:10.1016/j.jeurceramsoc.2016.05.010,
author = {Chen, Z and Wang, X and Atkinson, A and Brandon, N},
doi = {10.1016/j.jeurceramsoc.2016.05.010},
journal = {Journal of the European Ceramic Society},
pages = {3473--3480},
title = {Spherical indentation of porous ceramics: cracking and toughness},
url = {http://dx.doi.org/10.1016/j.jeurceramsoc.2016.05.010},
volume = {36},
year = {2016}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - A combined experimental-numerical approach is used to characterise the fracture of a porous bulk ceramic material (La0.6Sr0.4Co0.2Fe0.8O3) with porosities of 5-45%, undergoing spherical indentation. The Gurson model was used in FEM to describe the densification of the porous material. Indentation-induced radial cracks were observed, when the applied nominal contact pressure exceeded threshold values, with no Hertzian ring-cone cracks found. FEM analysis indicated that the cracks propagated mainly during unloading, driven by the tensile hoop stress generated near the contact circle. The stress intensity at the crack tip was estimated using an approximate analysis of the FEM stress field to derive toughness values that were consistent with values determined by conventional methods, provided that the crack length is sufficiently large compared with the contact radius and can be measured accurately. The absence of ring-cone cracks in the elastic field during loading is due to the material’s high modulus-to-hardness ratio and the small indenter radius as predicted by established theory.
AU - Chen,Z
AU - Wang,X
AU - Atkinson,A
AU - Brandon,N
DO - 10.1016/j.jeurceramsoc.2016.05.010
EP - 3480
PY - 2016///
SN - 0955-2219
SP - 3473
TI - Spherical indentation of porous ceramics: cracking and toughness
T2 - Journal of the European Ceramic Society
UR - http://dx.doi.org/10.1016/j.jeurceramsoc.2016.05.010
UR - http://hdl.handle.net/10044/1/32317
VL - 36
ER -