Stress bridging in a heterogeneous material

The fracture process of a material denoted PBS 9501 sugar mock, a simulant of the PBX 9501 high explosive, was studied using the optical technique of Coherent Gradient Sensing (CGS) interferometry. We found that in the PBS 9501 sugar mock material, crack initiation and propagation are preceded by th...

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Bibliographic Details
Published in:Engineering fracture mechanics 2000-09, Vol.67 (1), p.1-20
Main Authors: Liu, C., Stout, M.G., Asay, B.W.
Format: Article
Language:English
Subjects:
Heterogeneous materials
Optical interferometry
Stress bridging
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Summary:The fracture process of a material denoted PBS 9501 sugar mock, a simulant of the PBX 9501 high explosive, was studied using the optical technique of Coherent Gradient Sensing (CGS) interferometry. We found that in the PBS 9501 sugar mock material, crack initiation and propagation are preceded by the formation and extension of a sizable stress-bridging zone. Two mechanisms were identified as contributing to the bridging process. One is crystal interlocking and friction, and the other is binder stretching. By comparing the experimental CGS fringe pattern with one simulated using a simple bridging model, we found that the overall behavior of the bridging zone is hardening, which is consistent with the fact that majority of the bridging region is dominated by a binder stretching mechanism. We conclude that the entire process of stress-bridging initiation and extension, as well as subsequent crack propagation, has to be considered in describing the fracture behavior of high explosive materials.
ISSN:0013-7944
1873-7315
DOI:10.1016/S0013-7944(00)00041-2