Experimental Study and Theoretical Verification of Explosion-Proof Performance of Insulated Glass

Building glass fragment in a blast-related environment is the main cause of casualties. In order to analyze the explosion-proof performance of insulated glass quantitatively in conventional buildings, the explosion experiment under different shock wave loads was carried out on the insulated glass, the pressure sensor was used to collect the overpressure value of the explosion shock wave, and the high-speed camera was used to record the breaking process of glass. The broken state of the insulated glass and the critical overpressure value of the broken state under different working conditions were obtained. And the theoretical calculation method based on the equivalent static load was used to verify the critical overpressure value of the insulated glass. The research showed that the fragments scattered toward the center of the explosion source when the layer of the insulated glass face to the explosion wave front was broken, and the fragments mainly scattered in the direction of the shock wave propagation when it was completely broken. The theoretical calculation method based on the equivalent static load could be used to evaluate the explosion-proof performance of the insulated glass.

Anti-Explosion Performance of Composite Blast Wall with an Auxetic Re-Entrant Honeycomb Core for Offshore Platforms

To improve the anti-explosion performance of blast wall in offshore platforms, an auxetic re-entrant blast wall (ARBW) was proposed and designed based on the indentation resistance effect of an auxetic structure. Based on the numerical nonlinear dynamic analysis method verified by the explosion experiment of a conventional steel corrugated blast wall (CBW), the failure mechanisms of ARBW, steel honeycomb sandwich blast wall (HSBW) and CBW were investigated under distributed impulse loads. Computational results demonstrated the excellent anti-explosion performance of the proposed ARBW design. Concerning the minimal deformation at the mid-point of the proposed protective structures, the ARBW performed best. As regards the minimal deformation at the connection, both ARBW and HSBW worked well. The stress distribution of the connection illustrated the different energy absorption and transmission modes of the three blast walls.

Phenomenon of Gaseous Adiabatic Compression of Powder in Explosive Compaction

This paper introducesan explosion experiment, in which the powder can be recollected100%. Based on the observations inside the recollected powder case,it can be confirmed that the very small amount of air in the space within the powderis concentrated in the bottom of the powder case,and consequently results in adiabatic compression. The compression energy of air gives rise tothe extra high powder temperature. A theoretical approach to the adiabatic mechanism was discussed and a rough estimationwas provided onthe degree of the increased temperature.

Research on Three-Station Location Method for Nuclear Explosion Infrasound Detection

This paper, aiming at infrasound ternate array, adopts time difference of arrival of the sound wave to carry out event location calculation with program implementation to judge the direction of incoming wave of the explosion infrasound event and to estimate the distance of explosion dot at the same time. Through the verification of this algorithm by chemical explosion experiment, the result shows that the location precision is within the range of 2° and the distance estimation precision aiming at actual distance of 1,550m is within the range of 100m. Current technologies mainly adopt ternate array for event orientation and multiple ternate arrays crosswise to complete event location. Compared to the simplest single three-station infrasound location technology, the location method in this paper reaches a higher location precision.

Thermal Explosion Experiment of Energetic Materials

For the thermal safety evaluation of energetic materials, the experimental devices, test method, conditions of determination, numerical calculation and simulation are listed in this paper on thermal explosion experiment both at home and abroad. By listing typical examples and comparing the existing researches, current study and developing trend of thermal explosion experiment are summarized and prospected.

Experimenting Mechanism and Material Optimization of Fe-Ni Foam Metal about Suppressing Gas Explosion and Propagation

Using self-designed 30cm×30cm gas explosion experiment pipe and data acquisition system, we found Fe-Ni foam metal suppresses better gas explosion. We analyzed mechanism of suppressing gas explosion from material characteristics,. The three-dimensional holing-through structure of foam metal can quench exploding flame and decline exploding shock wave. Foam metal material has dual advantages of material and structure which can suppress transmission of fire and shock wave. Effect on different parameters of Fe-Ni foam metal materials was contrasted from declining overpressure and flame temperature, and suitable Fe-Ni form metal was optimized for engineering application.