Experiments where air is injected into a foam confined in a Hele-Shaw cell are convenient to study the rheology of foams far from the quasistatic regime, and their limit of stability. At low overpressure, the injected air forms a ductile crack, whereas at high overpressure, it breaks the foam like a brittle material. We present new results in this configuration, complementary with previous stud...

being seen in soldiers who survive such catastrophic injuries[6]. The destructive extent of an explosion is dependent on the nature of the device and the proximity of the soldier when it detonates[7]. In contrast to other forms of weapon (ie firearms), explosive devices have the capacity to injure multiple victims simultaneously by a variety of different mechanisms. Detonation of an explosive d...

The pressure-time profiles produced by initiation in free-air of four commercial sector explosives covering a range of velocities of detonation are reported. The results indicate that there are no significant differences in the blast wave shapes from the explosives when measured between 5 and 20 m from the initiation point. The dependence of peak overpressure and positive phase impulse on scale...

At a brewery, the base plate-to-shell weld seam of a 90-m(3) vertical cylindrical steel tank failed catastrophically. The 4 ton tank "took off" like a rocket leaving its contents behind, and landed on a van, crushing it. The top of the tank reached a height of 30 m. The internal overpressure responsible for the failure was an estimated 60 kPa. A rupture disc rated at < 50 kPa provided overpress...

The effects of building leakage on heat and mass transfer in buildings are difficult to model due to the difficulty in knowing crack size, shape, position, and number. Nevertheless, interest remains high in the estimation of crack areas in buildings because of the important effects cracks have on infiltration, indoor air quality, building energy performance, and because of interest in exploring...

Based on the double shockwave approximation procedure and combining the real ghost fluid method (RGFM) with the level-set method, a local Riemann problem for strongly nonlinear equations of state such as the JWL equation of state is constructed, which has suppressed successfully the numerical oscillation caused by high-density ratio and high-pressure ratio across the interface between the explo...

Estimating the costs of blasting operations is an important parameter in open-pit mining. Blasting and rock fragmentation depend on two groups of variables. The first group consists of mass properties, which are uncontrollable, and the second one is the drill-and-blast design parameters, which can be controlled and optimized. The design parameters include burden, spacing, hole length, hole diam...

Abstract To estimate the turbulence influence of branch tubes on rising rate gasoline-air mixture explosion overpressure, factor α was introduced to modify formula peak rise overpressure. Then, experimental data overpressure and under different numbers branches were obtained. Finally, laminar flame velocity put into correction formula, factors calculated. The results show that increasing number...