Engineering Transactions, 59, 1, pp. 5–13, 2011

Damage Reduction of Explosively Driven Spallation by Machining V-Notch Rows on the Surfaces of 304 Stainless Steel Plates

T. HIROE
Department of Mechanical System Engineering, Kumamoto University

K. FUJIWARA
Department of Mechanical System Engineering, Kumamoto University

H. HATA
Department of Mechanical System Engineering, Kumamoto University

K. NATASATO
Graduate School of Science and technology, Kumamoto University

K. MIZOKAMI
Graduate School of Science and technology, Kumamoto University

Plane detonation waves generated in the explosive PETN with use of wire-row explosion
technique for initiation have been applied to study on spall behaviour for circular plates of 304
stainless steel, and the slanting surface effects on the damage phenomena for conic frustums
and circular cones. In this paper, V-notch rows are produced on the free surface of the square
plate specimens of the same material and plane shock waves are similarly transferred from the
other surface. The cross-sectional observation of tested and recovered specimens shows that
remarkable effects on the reduction of spall damages have been achieved in case of appropriate
V-notch configurations. The effect seems to come obviously from weakened interaction of release
waves due to the dispersion of directions for reflection waves, and a hydro-code. Autodyn
2D/3D has successfully reproduced the experimental results numerically, suggesting a notch
parameter chart for spall damage evaluation.
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