Abstract:The paper presents results of experimental and numerical research on the mechanism of macrocavity collapse in highly heterogeneous, porous mixtures of Al and W particles with large differences in strength, ductility, and density of components. Mixtures with different grain sizes of W particles and porosity were investigated in plane-strain, high-strain-rate conditions using the explosively driven thick-walled cylinder method. It was demonstrated that macroscopic axial symmetry was preserved, and a pattern of l… Show more
“…And the thicknesses of explosive were 35, 60 and 80 mm, respectively. Specific features of the TWC method are: (1) thick-walled ductile copper tube driver, which prevents its geometric and material instabilities; (2) selection of the explosive with low density and detonation speed, ensuring the small-amplitude shock wave and avoiding spallation and rebound of the material; and (3) selection of the geometry of ductile copper stopper tube which controls the final strain [17]. Figure 1 TWC configuration (unit: mm).…”
The experiment was conducted by the radical collapse of thick-walled cylinders. Optical microscopic examination showed that sample ([Formula: see text] = 7.3 × 104 s−1, εef = 0.45) failed to produce adiabatic shear bands (ASBs), while ASBs were obtained in samples ([Formula: see text] = 1.48 × 105 s−1, εef = 0.86; [Formula: see text] = 1.18 × 105 s−1, εef = 0.81), which shows that the energy barrier in shear band formation was decreased with the increase of shear strain rate. With the increase of strain rate, the number of ASBs decreased and the spacing and the average length increased, and the propagation rate of ASBs increased from 213 m s−1 ([Formula: see text] = 1.18 × 105 s−1) to 417 m s−1 ([Formula: see text] = 1.48 × 105 s−1).
“…And the thicknesses of explosive were 35, 60 and 80 mm, respectively. Specific features of the TWC method are: (1) thick-walled ductile copper tube driver, which prevents its geometric and material instabilities; (2) selection of the explosive with low density and detonation speed, ensuring the small-amplitude shock wave and avoiding spallation and rebound of the material; and (3) selection of the geometry of ductile copper stopper tube which controls the final strain [17]. Figure 1 TWC configuration (unit: mm).…”
The experiment was conducted by the radical collapse of thick-walled cylinders. Optical microscopic examination showed that sample ([Formula: see text] = 7.3 × 104 s−1, εef = 0.45) failed to produce adiabatic shear bands (ASBs), while ASBs were obtained in samples ([Formula: see text] = 1.48 × 105 s−1, εef = 0.86; [Formula: see text] = 1.18 × 105 s−1, εef = 0.81), which shows that the energy barrier in shear band formation was decreased with the increase of shear strain rate. With the increase of strain rate, the number of ASBs decreased and the spacing and the average length increased, and the propagation rate of ASBs increased from 213 m s−1 ([Formula: see text] = 1.18 × 105 s−1) to 417 m s−1 ([Formula: see text] = 1.48 × 105 s−1).
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