The effect of shockwave profile shape on dynamic brittle failure
The role of shock wave loading profile is investigated for the failure processes in a brittle material. The dynamic damage response of ductile metals has been demonstrated to be critically dependent on the shockwave profile and the stress-state of the shock. Changing from a square to triangular (Tay...
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Published in | EPJ Web of conferences Vol. 26; pp. 2010 - 2015 |
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Main Authors | , , , , |
Format | Journal Article Conference Proceeding |
Language | English |
Published |
United States
EDP Sciences
2012
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Online Access | Get full text |
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Summary: | The role of shock wave loading profile is investigated for the failure processes in a brittle material. The dynamic damage response of ductile metals has been demonstrated to be critically dependent on the shockwave profile and the stress-state of the shock. Changing from a square to triangular (Taylor) profile with an identical peak compressive stress has been reported to increase the “spall strength” by over a factor of two and suppress damage mechanisms. The spall strength of tungsten heavy alloy (WHA) based on plate impact square-wave loading has been extensively reported in the literature. Here a triangular wave loading profile is achieved with a composite flyer plate of graded density in contrast to the square-wave loading. Counter to the strong dependence in wave profile in ductile metals, for WHA, both square and triangle wave profiles the failure is by brittle cleavage fracture with additional energy dissipation through crack branching in the more brittle tungsten particles, largely indistinguishable between wave profiles. The time for crack nucleation is negligible compared to the duration of the experiment and the crack propagation rate is limited to the sound speed as defined by the shock velocity. |
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Bibliography: | ark:/67375/80W-ZX4M37ZM-T other:2012EPJWC..2602010B istex:D6C7FDA2EC0C861F63FC1BB1D495AEE095343CC8 publisher-ID:epjconf_dymat2012_02010 USDOE LA-UR-12-00681; LA-UR-12-681 AC52-06NA25396 |
ISBN: | 2759807576 9782759807574 |
ISSN: | 2100-014X 2100-014X |
DOI: | 10.1051/epjconf/20122602010 |