Ding Yuanyuan, Zheng Yuxuan, Zheng Zhijun, Wang Yonggang, He Siyuan, Zhou Fenghua
Key Laboratory of Impact and Safety Engineering, Ministry of Education, Ningbo University, Ningbo 315211, China.
CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, China.
Materials (Basel). 2020 Dec 9;13(24):5616. doi: 10.3390/ma13245616.
Graded cellular material is a superb sandwich candidate for blast alleviation, but it has a disadvantage for the anti-blast design of sacrificial cladding, i.e., the supporting stress for the graded cellular material cannot maintain a constant level. Thus, a density graded-uniform cellular sacrificial cladding was developed, and its anti-blast response was investigated theoretically and numerically. One-dimensional nonlinear plastic shock models were proposed to analyze wave propagation in density graded-uniform cellular claddings under blast loading. There are two shock fronts in a positively graded-uniform cladding; while there are three shock fronts in a negatively graded-uniform cladding. Response features of density graded-uniform claddings were analyzed, and then a comparison with the cladding based on the uniform cellular material was carried out. Results showed that the cladding with uniform cellular materials is a good choice for the optimal mass design, while the density graded-uniform cladding is more advantageous from the perspective of the critical length design indicator. A partition diagram for the optimal length of sacrificial claddings under a defined blast loading was proposed for engineering design. Finally, cell-based finite element models were applied to verify the anti-blast response results of density graded-uniform claddings.
梯度多孔材料是减轻爆炸冲击的优质夹层候选材料，但在牺牲覆层的抗爆设计中存在一个缺点，即梯度多孔材料的支撑应力无法保持恒定水平。因此，开发了一种密度梯度均匀的多孔牺牲覆层，并对其抗爆响应进行了理论和数值研究。提出了一维非线性塑性冲击模型，以分析爆炸载荷下密度梯度均匀多孔覆层中的波传播。正梯度均匀覆层中有两个冲击波阵面；而负梯度均匀覆层中有三个冲击波阵面。分析了密度梯度均匀覆层的响应特性，然后与基于均匀多孔材料的覆层进行了比较。结果表明，均匀多孔材料覆层是优化质量设计的良好选择，而密度梯度均匀覆层从临界长度设计指标的角度来看更具优势。针对工程设计，提出了在给定爆炸载荷下牺牲覆层最佳长度的分区图。最后，应用基于单胞的有限元模型验证了密度梯度均匀覆层的抗爆响应结果。
