接触爆炸作用下抗爆型喷涂聚脲防护钢筋混凝土板爆炸试验和数值模拟

Study on Explosion Test and Numerical Simulation of Blast-mitigation Spray Polyurea Coated Reinforced Concrete Slabs under Contact Explosion

为研究接触爆炸荷载作用下Qtech T26抗爆型喷涂聚脲(T26聚脲)防护钢筋混凝土板(RC板)的抗爆性能和损伤机制,对有无T26聚脲防护RC板进行爆炸试验,通过扫描电子显微镜(SEM)对T26聚脲防护RC板的典型损伤区域进行微观分析。基于T26聚脲力学性能及爆炸试验建立有限元模型进行数值模拟,并与试验结果进行对比。研究结果表明:T26聚脲与RC板界面附着较好,可以抵抗界面拉伸波的作用,并实现对RC板损伤和变形的抑制;RC板在大当量爆炸荷载作用下的损伤以冲切破坏为主,T26聚脲宏观及微观损伤特点均表明背爆面变形起始位置为RC板冲切变形边缘区域,且会由于应变率效应发生脆性开裂;结合有限元模拟与爆炸试验,T26聚脲可以提高RC板的抗爆性能,并通过材料的高强、高韧、高阻尼特性实现10 kg TNT接触爆炸作用零破片的防护目标,在爆炸防护领域具有重要工程应用价值。

To study the protective properties and damage mechanisms of reinforced concrete(RC)slabs coated with Qtech T26 blast-mitigation spray polyurea(T26 polyurea)under contact blast load,explosion test was carried out on T26 polyeurea-coated RC slab and unprotected RC slab.Typical damage areas of the RC slabs protected by T26 polyurea were microscopically analyzed by scanning electron microscopy(SEM).The numerical simulation was carried out by establishing a finite element model based on the mechanical properties of T26 polyurea and the explosion test,and were compared with the test results.The results showed that T26 polyurea was well attached to the interface of RC slab,which could resist the action of interfacial tensile waves,and inhibit the damage and deformation of RC slab.The damage to RC slab under large equivalent blast loads was dominated by shear damage.Both macroscopic and microscopic damage characteristics indicated that the deformation on the back blast surface starts from the punching deformation edge of RC plate,and that brittle cracking of the material would occur due to the strain rate effect.Combined with numerical simulation and explosion test,T26 polyurea could improve the blast mitigation of RC slab,and through the high strength,high elongation and high damping properties of the material to achieve the target of 10 kg TNT contact explosion with zero fragmentation,which had significant engineering value in the field of anti-explosive protection.