Underwater explosion seriously affects the combat performance and vitality of submarines. In order to improve blast resistance stiffened double cylindrical shells, a new type style that replaces traditional T-shaped stiffeners with circular tube stiffeners, namely O-shaped are studied. A series comparative underwater tests carried out on two scaled shells O stiffeners. Based tests, more detaile...

To study the dynamic response of a pressurized thin-walled circular tube structure subjected to near-field underwater explosion, deformation and damage tests cylindrical shell with different internal pressures wall thicknesses effects an explosion from 2 g explosives at stand-off distances were carried out in water tank. LS-DYNA finite element software was used carry relevant numerical simulati...

We have developed a cepstral simulation and inversion algorithm for analysis of regional seismic recordings of underwater explosions that determines the yield and depth of the explosions. The spectra of seismic recordings of the underwater blasts have strong time-independent spectral scalloping produced by the correlated bubble pulses and echoes of acoustic reflections from the water surface an...

In this study, the cavitation effect induced by two charges in underwater explosions near free surfaces is numerical researched dimensional compressible multiphase fluids based on a four-equation system with phase transition model. The occurrence of generation, development, and collapse two-charge can be captured directly. detailed density, pressure, vapor volume fraction contours during intera...

Fiber composite material panels and sandwich panels possess both a high resistance to weight ratio and a high stiffness to weight ratio. Due to these features, fiber composite panels are used widely in aeronautic and marine structures, where the improvement of the structural performance while keeping a low weight is crucial. Sandwich structures, consisting of a foam core enclosed by two externa...