高速冲击对嵌入纤维棒增强剪切硬化材料的负泊松比夹层板的有限元建模与分析

The impact resistance characteristics of a negative Poisson's ratio sandwich panel embedded with fiber rod reinforced shear hardening material under high-velocity impact are studied using a combination of simulation and experimentation. Based on a comprehensive consideration of the constitutive relationships between the panel and core, as well as different material failure criteria, a high-speed impact finite element model of such a sandwich structure is established using ABAQUS software. The key parameters such as the impact damage area, residual velocity of the projectile, and critical velocity of the structure are also solved. In addition, a fabrication method for the tested specimens is proposed, and a high-speed impact test system is established for measurement and validation research. The study has found that the developed model has maximum errors of 3.9%, 8.8%, and 5.9% in predicting the area of structural damage, residual velocity of the projectile, and critical velocity of impact, respectively. Furthermore, the calculated impact damage mode is in good agreement with the experimental ones, fully verifying the effectiveness of such a model and its prediction results. In addition, it is observed that the critical impact velocity of the structure increases by 26.6% when it is embedded with fiber rod reinforced shear hardening material, proving that this reinforcement approach can effectively enhance its impact resistant capability.