Fragmentation in biaxial tension

Abstract

We have carried out an experiment that places a ductile stainless steel in a state of biaxial tension at a high rate of strain. The loading of the ductile metal spherical cap is performed by the detonation of a high explosive layer with a conforming geometry to expand the metal radially outwards. Simulations of the loading and expansion of the metal predict strain rates that compare well with experimental observations. A high percentage of the HE loaded material was recovered through a soft capture process and characterization of the recovered fragments provided high quality data, including uniform strain prior to failure and fragment size. These data were used with a modified fragmentation model to determine a fragmentation energy. UNCLASSIFIED UNCLASSIFIED3

A call to arms for task parallelism in multi‐scale materials modeling

“…Fragmentation as a function of microstructure and loading condition has been examined by various means, often employing high explosives to generate the loading [56,57]. To some degree, changes in loading geometry can be used to explore loading conditions in a dynamic analogy to a forming limit diagram [58].…”

Shock-induced phase transformation in tantalum

“…Details of explosively driven shock-recovery experiment used for this investigation can be found in [6]. Single explosively driven shock-recovery experiments were conducted by detonating explosive on hemisphere-shaped alloy plates (3mm thick) that were shocked into polyurethane foams immersed in a water tank.…”

Dynamic shear fracture of an explosively-driven metal cylindrical shell

“…Compared to the comprehensive understanding of fragment formation and its statistic distribution, quantitative investigation on dynamic process for the metal cylindrical shell is still sparse, particularly for dominated shear fracture, which originates from adiabatic shear localization. Up to date, available experimental methods [12][13][14][15][16][17][18][19][20] for characterizing shear fracture failure mainly have: 1) high-speed framing camera, which determines the fracture mode from the photographed images of shell surface; 2) metallurgical characterization, which observes micrograph of the recovered fragments, e.g. large strain localization represents adiabatic shear band.…”