负泊松比结构由于优异的力学特性，逐渐被广泛应用于抗爆炸、抗侵彻等领域。提出了一种基于负泊松比结构的复合结构，从抗侵彻、抗爆炸两个角度设计了三个主要功能层，运用有限元仿真方法探究了异型陶瓷负泊松比复合结构在爆炸环境和弹丸侵彻下的响应特征，分析了防护机理并设计了参数优化方案，研究了陶瓷层最低厚度、负泊松比结构纵向蜂窝数、内凹六边形凹角、钢板厚度、聚脲层厚度等参数对结构抗爆抗弹性能的影响。通过能量吸收率(Specific Energy Absorption，SEA)、侵彻深度、中心点位移等指标评估不同参数组对应复合结构的防护能力。结果表明，陶瓷层最低厚度是影响结构抗侵彻能力的最大因素，聚脲层厚度和负泊松比结构纵向蜂窝数是影响结构抗爆能力的较大因素。在降低面密度的同时调整各参数，获得了最优抗爆抗侵彻的复合结构设计方案，实现了低面密度与高强防护的结合。研究提供了工程防护增强设计的新思路，助力推进了防护工程轻质化、模块化发展。
Numerical simulation study on ballistic and blast resistance of heterotypic ceramic negative Poisson's ratio composite structures
Due to their exceptional mechanical properties,negative Poisson's ratio structures are extensively utilized in explosion and penetration resistance applications.This paper proposes a composite structure based on negative Poisson's ratio,tailored to modem operational protection requirements.The structure comprises three primary functional layers designed to enhance both penetration and explosion resistance perspectives.The response characteristics of the structure under explosive environments and projectile penetration were explored using finite element simulation methods.The protection mechanism was analyzed,and a parameter optimization scheme was devised.The effects of various parameters,including the minimum thickness of the ceramic layer,the longitudinal honeycomb number of the negative Poisson's ratio structure,the concave hexagonal angle,the thickness of the steel plate,and the thickness of the polyurea layer,on the structure's anti-knock and anti-elastic properties were thoroughly investigated.Specific Energy Absorption(SEA),penetration depth,and center point displacement were utilized to assess the protective capabilities of the composite structure.The findings indicated that the thickness of the ceramic layer had the most significant impact on penetration resistance,whereas the explosion resistance was predominantly influenced by the thickness of the polyurea layer and the longitudinal honeycomb number within the negative Poisson's ratio structure.By reducing the surface density and adjusting each parameter value,we obtained the optimal design scheme for anti-explosion and anti-penetration composite structures,achieving optimal comprehensive performance with low surface density and high-strength protection.Compared to traditional composite protective structures,the negative Poisson's ratio composite structure exhibits more efficient explosion-proof and ballistic capabilities.It effectively enhances the protective capacity of the composite structure through adjustments in key parameters such as the minimum thickness of the ceramic layer,the longitudinal honeycomb number of the negative Poisson ratio layer,and the thickness of the polyurea layer.Moreover,it achieves these improvements with minimal surface density increase,thereby enhancing energy absorption efficiency per unit surface density of the structure.
safety engineeringnegative Poisson's ratiosandwich structureanti-explosion and anti-bulletparameter optimization
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