活性射流作用复合混凝土结构动态毁伤特性

The dynamic damage characteristics of composite concrete structure under the combined action of reactive jet penetration and explosion are studied. A method combining full-scale damage experiment and kinetic-chemical energy segmented numerical simulation is used to obtain the dynamic damage characteristics of composite concrete structures with different surface layer thicknesses under the action of reactive jet. The findings reveal various damage modes, including central penetration holes, collapse, bulge, and radial / circumferential cracks, in the concrete layers under the combined action of PTFE / Al jet penetration and explosion. As the thickness of the concrete layer increases, the spalling area increases, while the height of bulge and the number of radial cracks decrease. Utilizing finite element analysis software, in conjunction with the reactive characteristics of the jet and a modified-RHT concrete model capable of simulating concrete tensile failure, the study employed the FEM-SPH algorithm and restart approach for segmented numerical simulation of damage behavior, resulting in damage effect diagrams to further analyze the mechanisms behind damage discrepancies. The spatial distribution characteristics of the reactive jetare pesented by combining experimental and numerical results, establishing the relationship between kinetic penetration damage and explosion-enhanced damage. The numerically simulated results are in good agreement with the experimental results. The results show that, on the basis of kinetic energy damage, the diameters of penetrating hole and damaged areaare increased by 116% and 59. 7%, respectively, under the action of explosion enhanced; damage of reactive jet.