A dynamic disturbance will induce cracks around the tunnel in blasting or shield construction. To investigate overall stability of with various angles during a fixed borehole (round hole explosion) blasting, models containing an individual crack different were introduced for simulation research. The research set up thin sheet model length 350 mm and width 150 mm, 7 diameter pre-existing 75 5 mi...

In order to quantitatively describe the energy dissipation law of jointed rock mass, we obtained cores in laboratory conditions using marble from roof and floor Jinchanghe Lead–zinc mine Baoshan. The dissipative degree stress wave mass is measured by introducing quality factor Qs parameter. Based on experimental principle Split Hopkinson Pressure rod loading device (SHPB), proposed a three-wave...

In recent years, significant efforts were taken at CERN and other high-energy physics laboratories to study predict the consequences of particle beam impacts on devices such as collimators, targets, dumps. The quasi-instantaneous impact raises complex dynamic phenomena which may be simulated resorting implicit codes, for what concerns elastic or elastoplastic solid regime. However, when velocit...

Over the past two decades, aircraft crashworthiness has seen major developments, mainly with modern computing systems and commercial finite element (FE) codes. The structure material have been designed to absorb more kinetic energy ensure enough safety during a controlled crash condition. However, fuselage section an onboard auxiliary fuel tank requires special arrangements, since inclined stru...

Abstract In many urban buildings, there is the presence of gas central storage, which contain pressurized tanks. One main risks in these places an explosion, may or not followed by fire. general, shock wave formed this phenomenon disastrous and can cause material damage even fatalities. Recent research has contributed to understanding protective systems against phenomenon; however, it necessary...

Floating pontoons have played a supreme and indispensable role in crises disasters for both civil military purposes. bridges ferries are exposed to blast loadings the case of wars or terrorist attacks. The protection effectiveness sacrificial cladding subjected was numerically investigated. In this study, steel ferry has been simulated side explosions with different explosive charges at certain...

Abstract The wide usage of TNT as a main charge for fragmentation shells has been eliminated due to its lower performance and exudation on the fuze thread relevant safety measures inconvenience. These disadvantages have not become accepted anymore desired requirements limited efficiency TNT, especially when different new explosives are introduced into researches. This research studies calculati...