负泊松比防爆墙抗爆性分析OA
Analysis of explosion resistance of the blast wall with negative Poisson's ratio structure
为提升防爆墙的抗爆性能,将负泊松比结构与超高韧性水泥基复合材料(ultra-high toughness cementitious composites,UHTCC)结合,并通过爆炸试验与数值模拟相结合的方法,分析负泊松比靶板的抗爆性能,证明 UHTCC 负泊松比靶板的抗爆优越性.首先,利用混凝土 3D 打印技术实现负泊松比结构建造,并通过靶板接触爆炸试验结果验证有限元模型的可靠性.在此基础上,利用该有限元模型模拟分析了靶板材料、结构、胞元内凹角及实心层厚度占比等因素对接触爆炸下结构破坏形态与能量消耗的影响.结果表明:(1)具有高韧性的 UHTCC 靶板抗爆性能显著优于混凝土靶板;(2)3 种结构中,负泊松比结构板吸能能力最强,实心板更能保持结构的完整性;(3)当负泊松比胞元内凹角为 61°时抗爆性能最优,过小或过大均降低结构抗爆性;(4)负泊松比结构厚度占靶板总厚度过大时抗爆性能弱,结构破坏严重,可上下层同时或仅背爆面增加实心层厚度,在有效削弱爆炸冲击波、吸收能量的同时,提高结构完整性.研究验证了负泊松比 UHTCC 板抗爆性能优越性,并为基于负泊松比结构的防爆墙设计提供了理论依据.
To improve the explosion resistance of the blast wall,it is proposed to combine the negative Poisson's ratio structure with ultra-high toughness cementitious composites(UHTCC),Through a combination of the explosion experiment and numerical simulation,the anti-explosive property of negative Poisson's ratio slabs has been studied,to prove the superiority of the anti-explosive properties of the negative Poisson's ratio UHTCC slabs.Firstly,a negative Poisson's ratio structural slab was constructed using concrete 3D printing technology and optimizing the printing path,which verified the constructability of the negative Poisson's ratio structural slab,and the negative Poisson's slab was subjected to a contact explosion test.Using LS-DYNA software,a finite element model of fluid-solid coupling was established according to the explosion test conditions,and the finite element model was verified by comparison of the slab damage pattern in the contact explosion test and the simulation.On this basis,the verified finite element model was used to simulate and analyze the effects of different materials(concrete and UHTCC),structures(negative Poisson's ratio structure,positive Poisson's ratio structure,and solid structure),cell concave angles,and solid layer thickness ratios on the anti-explosive properties of negative Poisson's structural slabs under contact explosion.By comparing the slab damage patterns and the ability of energy absorption,which was determined by the value of the air overpressure behind the slabs,the design of a negative Poisson's ratio structure target plate with the best anti-explosive properties was obtained.The results show that:(1)due to the high toughness,the explosion resistance of UHTCC slabs is significantly better than that of concrete slabs.The UHTCC slabs all remained intact,and the concrete target slabs were all penetrated.(2)The negative Poisson's ratio slab has the best ability to absorb energy among the three kinds of structures,while the solid slab is better at maintaining the structural integrity.(3)When the negative Poisson's ratio of the cell concave angle is 61°,the structure has optimal explosion resistance,and both smaller and larger angles reduce the explosion resistance of the structure.(4)When the thickness of the negative Poisson's ratio structure is too large as a proportion of the total thickness,the slab is severely damaged.Increasing the solid layer thickness of the backburst surface of the slab,or simultaneously increasing the solid layer thickness of the explosion-facing and backburst surfaces,is conducive to weakening the blast shock wave and improving structural integrity.This study confirmed the superiority of the explosion resistance of negative Poisson's ratio UHTCC slab,and provides a theoretical basis for the design of blast walls based on negative Poisson's ratio structure.
王千惠;全冠;李庆华;姚盼;徐世烺
浙江大学高性能结构研究所,浙江 杭州 310058浙江大学高性能结构研究所,浙江 杭州 310058浙江大学高性能结构研究所,浙江 杭州 310058浙江大学高性能结构研究所,浙江 杭州 310058浙江大学高性能结构研究所,浙江 杭州 310058
数理科学
负泊松比结构超高韧性水泥基复合材料爆炸荷载抗爆性能
negative Poisson's ratio structureultra-high toughness cementitious compositesexplosive loadexplosion resitance
《爆炸与冲击》 2026 (4)
115-130,16
国家自然科学基金(52225803)
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