A model for fracture of explosively driven metal shells

Design and testing of an anti-scattering grid for medium-energy X-ray flash radiography

“…Moreover, 1-MeV flash radiography has been an indispensable probe to study the expansion and fracture of metal shell subjected to explosive loading (Gold and Baker, 2008;Li et al, 2009;. High-quality imaging is of great importance to determine the density distribution and the edge of the shell, the location of fatigue and damage in accessory, and so on.…”

“…However, there has been no study so far reporting the use of antiscattering grid by the medium X-ray energy. In this region, flash radiography or X-ray imaging technique is used both in industry CT and in the study of expansion and fracture of the metal shell (Gold and Baker, 2008;Li et al, 2009;. In the second case, an object with high strength is always set as a shield to prevent the fragments from damaging the image recording device, and this will cause a serious scatter background.…”

On the dynamics of localization and fragmentation-IV. Expansion of Al 6061-O tubes

“…They speculated that material property changes due to shock compression prior to the large straining might influence the response of the cylinders. In another recent study, Gold and Baker (2008) used an arbitrary LagrangianEulerian code, enhanced with the Mott fragmentation model and successfully predicted the fragmentation distribution in metal shells that contain a cylindrical portion, but terminated at one end by a shaped cap; the comparison, of course, requires the back-fitting of parameters that capture the statistical distribution of flaws and strain to failure. The most promising aspect of this study is the demonstration of the ability of the Mott model to capture the fragment size distribution.…”

A gas gun based technique for studying the role of temperature in dynamic fracture and fragmentation

“…Geometries tested have included spheres, 8 hemispheres, 9 cylinders, 10-12 rings, 13,14 and explosive shells. 15 The largest volume of work published on expanding cylinders has focused on explosively loaded samples. [16][17][18][19][20] The material of interest is either packed with an explosive charge or can be placed on a "driver cylinder" containing the charge designed to transfer radial momentum to the sample ring or cylinder around it.…”

“…The kinematic mounts were staggered to enable closer spacing of the probes along the length. The mounts were angled at 15 to ensure that the beam was normal to the cylinder surface. The surface was lightly polished while still on the lathe to assist in as much laser light returning to the probe as possible; the power delivered to each probe was 5 mW.…”