Study On Dynamic Response Of Aluminum Foam Sandwich-like Plate Structure Under Gas Blast

Composite multilayer structure under explosive shock effect of blast-resistant and shock resistance study is currently hot topic in civil engineering structures protection design. Common complex multilayer structures use panel-foam corebackplane sandwich structure. Aluminum foam is a representative porous lightweight metal material, it stress-strain curve exhibit a longer plastic yield platform when it is under external loads, and with high energy absorption capability, it can withstand the impact of large plastic deformation produced by the explosion, it is specially designed to withstand the impact of an explosion effect, and it often used as a sandwich plate core. In recent years, domestic and foreign researchers use fly ash hollow spherical shell and aluminum prepare a more excellent mechanical property of aluminum matrix composites-hollow microspheres / Al composite foam material, the porous composite material not only has hi gher compressive yield strength compared to normal aluminum foam, but also has a higher energy absorption capability and other unique physical and chemical properties, it has great potential in various fields of national defense, aerospace, ships, etc., th is composite and Research sandwich plate structure under explosive shock effect of the relevant mechanical properties and absorption behavior is still in its infancy.This paper focuses on complex multilayer structure under dynamic response of gas explosion and absorption behavior, carried out the following work with experimental and numerical simulation technology.Part 1: By LS-DYNA software, this paper analysis the aluminum composite foams microscopic scale mechanical, study the damage evolution under dynamic compression foam inside the hollow microspheres of aluminum matrix composites and crush in the whole process, the unit cell damage process and three stages feature aero monas compressive stress-strain curve model, the influence of various parameters on the aluminum matrix composite micromechanics foam properties;Part 2: Use large-scale test detonation of combustible premixed gas loading system(GBS) to do the gas explosion test, use high-frequency dynamic pressure sensor PCB to measure burst mode internal blast overpressure duration curve in different positions, explore acetylene gas concentration, inflation time, and other factors in premixed combustible gas explosion impact load strength of the law;Part 3: GBS explosion test apparatus based on aluminum foam sandwich panels and solid aluminum plate explosion shock performance test, get a dynamic strain specimen examined, structural deformation and failure mode of the structure of the largest plastic displacement and energy absorption of comparison b etween different sandwich plate structures; nonlinear dynamic finite element software LS-DYNA establish GBS systems and finite element model of the specimen examined, explosion numerical simulation to reproduce the test results to obtain a combustible premixed gas blast detonator in the mold of propagation, and measure with the test overpressure value, validate finite element model;...