Imperial College London

ProfessorNeilAlford

Central FacultyOffice of the Provost

Associate Provost (Academic Planning)
 
 
 
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Contact

 

+44 (0)20 7594 6724n.alford

 
 
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Assistant

 

Miss Catherine Graham +44 (0)20 7594 3330

 
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Location

 

2..05 (in RSM) or 3.09 (in the Faculty Building)Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@inproceedings{Fradkin:2009:10.1007/978-1-4020-9033-2-4,
author = {Fradkin, L and Mishakin, V and Alford, N and Dobroskok, A and Linkov, A and Mishuris, G},
doi = {10.1007/978-1-4020-9033-2-4},
pages = {37--47},
title = {Perturbing paths of slow cracks in PMMA by local heating},
url = {http://dx.doi.org/10.1007/978-1-4020-9033-2-4},
year = {2009}
}

RIS format (EndNote, RefMan)

TY  - CPAPER
AB - Real-time control of the direction of a propagating crack is little explored area of management of structural integrity. We have examined it with experiments on quasi-static (slow) cracks in PMMA (Polymethyl-Methacrylate). We have observed that in PMMA when the mean crack speeds are low (between 0.1 and 0.4mms -1) secondary thermal sources of relatively low power (of the order of 2W) can be used to achieve a significant crack redirection. In this interval the micro-photographs of cracks present a fishbone structure, and we argue that the side lobes are micro-cracks which appear inside shear bands. The respective fracture surfaces look rippled (hackled). We have observed a clear reverse correlation between the crack speed and the angle of redirection. When the mean crack speed exceeds 0.4mms -1 and the fracture surface is mirror smooth no trajectory redirection is achieved. It appears the micro-cracks act as notches and alleviate crack redirection. Therefore, one of our conclusions is that it might be possible to use relatively weak sources to redirect fast cracks that propagate with a super-critical speed. This hypothesis is advanced because fast cracks are also known to possess a fishbone structure and hackled fracture surface. © 2009 Springer Science+Business Media B.V.
AU - Fradkin,L
AU - Mishakin,V
AU - Alford,N
AU - Dobroskok,A
AU - Linkov,A
AU - Mishuris,G
DO - 10.1007/978-1-4020-9033-2-4
EP - 47
PY - 2009///
SN - 1875-3507
SP - 37
TI - Perturbing paths of slow cracks in PMMA by local heating
UR - http://dx.doi.org/10.1007/978-1-4020-9033-2-4
ER -