Study On Antiknock Performance Of Polyurea Elastomer Sandwich Explosion

Explosion-proof security is a research field of great interest to countries around the world. The blast shock wave can not only result in destruction of public facilities like buildings, but also can penetrate the protective structure, causing damage to the people behind the protective structure. Developing light-weight explosion-proof pots with good antidetonation property is the goal of protection field in public place. The appearance of sandwich structure and new polymer materials provides a new direction and provides theoretical basis for engineering application of new explosion-proof pots.The article mainly researched the property of antidetonation on the explosion-proof pots made of sandwich structure with polyurea elastomer. Three factors (maximum radial deformation of the explosion-proof pots, attenuating range of shock wave propagation and energy absorbing properties of the sandwich structure) were concentrated in this article using method of combining theoretical analysis, numerical simulation and experimental research. The influencing factors of antidetonation property were analyzed by theoretical calculation. Simulation calculation was used to research maximum radial deformation of the explosion-proof pots and attenuating range of shock wave propagation. The reliability of the simulation results was validated by deformation experiment of explosion-proof pots.The main research content of this article includes the following aspects:(1) The deformation mechanism of sandwich structure under explosive loading was studied. The attenuation range of shock wave was related to wave impedance of material. The energy absorbing properties of the sandwich structure was related to thickness of sandwich.(2) The finite element code LS-DYNA was used to numerically simulate the process of dynamic response of three kinds of explosion-proof pots under explosive loading.The results demonstrated that explosion-proof pot made of sandwich structure with polyurea elastomer is superior to the ones without sandwich and made of rubber sandwich under the same explosive loading, either in deformation or in energy absorption. Attenuating range of shock wave propagation in polyurea elastomer is the largest.(3) The factors (dosage, thickness of sandwich and configuration mode) on antidetonation property of explosion-proof pots were studied. The results demonstrated that with the increase of dosage, the radial deformation became larger. Attenuating range of shock wave propagation was the largest when the thickness of sandwich was 30mm and inner diameter without change. Explosion-proof pots had minimum radial deformation when the thickness of sandwich was 30mm and outer diameter without change. It could reduce radialdeformation when explosion-proof pots had thick inner diameter and thin outer diameter.(4) The anti-explosion experiment of explosion-proof pots made of sandwich structure with polyurea elastomer was carried out. Compared the test maximum radial deformation of the outer face-sheet of explosion-proof pots with the simulation, the deviation was less than 10%. Therefore, the results were receivable.