Abstract
The metallurgical behaviour of HSLA steel subjected to underwater explosion is of prime importance because of its structural applications in underwater vehicles. HSLA steel plates 300 × 250 × 4 mm were subjected to single and repetitive shock loadings and the point of rupture was identified. Test plates exhibited mode-I (large ductile deformation) and mode-II (tensile tearing) macroscopic failures. Electron micrographic and fractographic examination showed that the initiation of fracture was due to adiabatic shearing and the microscopic mode of failure was ductile. Plates subjected to single shock showed an increase in residual hardness and at the point of rupture it was approximately one-third higher than the initial residual hardness.
Highlights
The ability of a material to withstand large plastic deformation before it fractures is a major criterion in underwater structural applications (Sumpter, 1987)
The Explosion Bulge Test (EBT) has been used as the final qualification test to verify the dynamic plasticity of structural materials (Porter, 1988)
Performance of steel plates and weldments subjected to a high level of dynamic plastic deformation from explosive shock has been studied extensively by various authors
Summary
The metallurgical behaviour of HSLA steel subjected to underwater explosion is of prime importance because ofits structural applications in underwater vehicles. HSLA steel plates 300 x 250 x 4 mm were subjected to single and repetitive shock loadings and the point of rupture was identified. Test plates exhibited mode-/ (large ductile deformation) and mode-II (tensile tearing) macroscopic failures. Electron micrographic andfractographic examination showed that the initiation offracture was due to adiabatic shearing and the microscopic mode offailure was ductile. Plates subjected to single shock showed an increase in residual hardness and at the point of rupture it was approximately one-third higher than the initial residual hardness
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