Science and Technology of Energetic Materials

Vol.69, No.3 (2008)

Research paper

Experimental and numerical study on dynamic buckling of 304 stainless steel cylinders impacted by explosively driven flyer plates
Tetsuyuki Hiroe, Kazuhito Fujiwara, Hidehiro Hata, and Keisuke Sashima


In this study, smooth walled tubular specimens (L, Do, t: 10 0 × 34 × 3 mm) of 18Cr-8Ni stainless steel were vertically set on a steel support plate and impacted at the top side vertically or axially by circular flyer plates (D, h: 80 × 20 mm) of the same material. The direct explosive driver was a slab-like installed powder PETN (charged density: 0.90-0.95 ×103 kg·m-3, height variations: 10, 15 and 20 mm) initiated by simultaneous explosion of paralleled fine copper wire rows placed over the entire outer surface using a discharge current from a high-voltage capacitor bank. All the tested cylinders impacted at the estimated velocities of around 80, 92 and 120 m·s-1 were locally buckled and plastically deformed mainly near the bottom part showing the almost symmetrical patters of flattened waves with the number of 1.5, 2.0 and 3.0 respectively. A hydro code Autodyn 2D was adopted to simulate the experimental phenomena generated in this explosive driven impact test system for cylinders. The numerical results reproduced experimental final lengths and deformation patterns of impacted cylinders successfully for three cases. The numerical time-histories of momentum for the flyer plates and axial stresses at the sectional surface in the bottom support plate indicated the momentum absorption ratios of 22 – 31 %.

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Dynamic axial buckling, Stainless steel cylinder, Explosive driven flyer, Symmetrically deformed fold,Momentum absorption ratio.

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