Imperial College London
Portrait Picture

DrEmilioMartinez-Paneda

Faculty of Engineering, Department of Civil and Environmental Engineering

Visiting Reader
 
 
 
//

Contact

 

+44 (0)20 7594 8188e.martinez-paneda Website

 
 
//

Location

 

249Skempton BuildingSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Navidtehrani:2022:10.1016/j.ijrmms.2022.105227,
author = {Navidtehrani, Y and Betegón, C and Zimmerman, RW and Martínez-Pañeda, E},
doi = {10.1016/j.ijrmms.2022.105227},
journal = {International Journal of Rock Mechanics and Mining Sciences},
pages = {1--16},
title = {Griffith-based analysis of crack initiation location in a Brazilian test},
url = {http://dx.doi.org/10.1016/j.ijrmms.2022.105227},
volume = {159},
year = {2022}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The Brazilian test has been extremely popular while prompting significant debate. The main source of controversy is rooted in its indirect nature; the material tensile strength is inferred upon assuming that cracking initiates at the centre of the sample. Here, we use the Griffith criterion and finite element analysis to map the conditions (jaws geometry and material properties) that result in the nucleation of a centre crack. Unlike previous studies, we do not restrict ourselves to evaluating the stress state at the disk centre; the failure envelope of the generalised Griffith criterion is used to establish the crack nucleation location. We find that the range of conditions where the Brazilian test is valid is much narrower than previously assumed, with current practices and standards being inappropriate for a wide range of rock-like materials. The results obtained are used to develop a protocol that experimentalists can follow to obtain a valid estimate of the material tensile strength. This is showcased with specific case studies and examples of valid and invalid tests from the literature. Furthermore, the uptake of this protocol is facilitated by providing a MATLAB App that determines the validity of the experiment for arbitrary test conditions.
AU  - Navidtehrani,Y
AU  - Betegón,C
AU  - Zimmerman,RW
AU  - Martínez-Pañeda,E
DO  - 10.1016/j.ijrmms.2022.105227
EP  - 16
PY  - 2022///
SN  - 0020-7624
SP  - 1
TI  - Griffith-based analysis of crack initiation location in a Brazilian test
T2  - International Journal of Rock Mechanics and Mining Sciences
UR  - http://dx.doi.org/10.1016/j.ijrmms.2022.105227
UR  - http://arxiv.org/abs/2209.06456v1
UR  - https://www.sciencedirect.com/science/article/pii/S1365160922001939
UR  - http://hdl.handle.net/10044/1/100055
VL  - 159
ER  -
Download