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Accession Number ADA585331
Title Spall-Fracture Physics and Spallation-Resistance-Based Material Selection.
Publication Date Sep 2012
Media Count 12p
Personal Author B. Pandurangan B. A. Cheeseman C. Yen M. Grujicic
Abstract Spallation is a fracture mode commonly observed in ballistically/blast-wave-loaded structures. The interaction between decompression waves generated within the target structure produces tensile stresses which, if of a sufficient magnitude, may cause material damage and ultimate fracture (spallation). In this study, the phenomenon of spall-fracture is analyzed within a one-dimensional Lagrangian framework. Two distinct analyses are carried out. Within the first analysis, decompression waves are treated as decompression shocks, which simplified the analysis and enabled the formation of spallation-strength-based material index. In the second analysis, decompression waves are treated as smooth (centered simple) waves. This increased the fidelity of the computational analysis, but the material-selection procedure could be done only numerically and an explicit formulation of the spallation-strength-based material-selection index could not be carried out. Overall, the two analyses yielded similar results for the spallation-strength-based material-selection criterion suggesting that the simpler (decompression shock based) one is still adequate for use in the material-selection process.
Keywords Blast waves
Decompression
Decompression waves
Fracture(Mechanics)
Material-selection methodology
Shock
Spall-fracture
Spallation
Spallation resistance
Tensile stress


 
Source Agency Non Paid ADAS
NTIS Subject Category 79E - Detonations, Explosion Effects, & Ballistics
46E - Structural Mechanics
Corporate Author Army Research Lab., Aberdeen Proving Ground, MD. Survivability Materials Branch.
Document Type Journal article
Title Note Journal article.
NTIS Issue Number 1403
Contract Number 4036-CU-ONR-1125

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