活性射流作用复合混凝土结构动态毁伤特性

Dynamic Damage Characteristics of Composite Concrete Structure Subjected to Reactive Jet

为研究复合混凝土结构在活性射流侵彻与爆炸联合作用下动态毁伤行为,采用全尺寸毁伤实验和动能-化学能分段数值模拟相结合的方法,获取活性射流作用不同面层厚度复合混凝土结构动态毁伤特性。实验结果表明:在PTFE/Al活性射流侵彻-爆炸联合作用下,混凝土层出现中心侵孔、崩落、隆起、径向/环向裂纹等多种毁伤模式,随混凝土层增厚,崩落面积增大,但隆起高度与径向裂纹数量减少。基于有限元分析软件,引入改进RHT混凝土模型,结合活性射流反应特性,采用FEM-SPH算法对动能侵彻-爆炸增强毁伤行为进行分段数值模拟,结合实验和数值模拟结果,给出活性射流有效质量空间分布特性,确定动能侵彻和爆炸增强毁伤增益关系,研究表明,活性射流爆炸增强毁伤可在动能侵彻毁伤基础上,分别对侵孔直径和破坏区直径增大116%和59.7%,大幅提升对复合混凝土结构破坏效果。

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.