Li Xiangcheng, Lin Yuliang, Lu Fangyun
College of Liberal Arts and Science, National University of Defense Technology, Changsha 410073, China.
Materials (Basel). 2019 Jul 10;12(14):2222. doi: 10.3390/ma12142222.
Lightweight aluminum honeycomb is a buffering and energy-absorbed structure against dynamic impact and explosion. Direct and indirect explosions with different equivalent explosive masses are applied to investigate the in-plane deformation characteristics and energy-absorbing distribution of aluminum honeycombs. Two finite element models of honeycombs, i.e., rigid plate-honeycomb-rigid plate (RP-H-RP) and honeycomb-rigid plate (H-RP) are created. The models indicate that there are three deformation modes in the direction for the RP-H-RP, which are the overall response mode at low equivalent explosive masses, transitional response mode at medium equivalent explosive masses, and local response mode at large equivalent explosive masses, respectively. Meanwhile, the honeycombs exhibit two deformation modes in the direction, i.e., the expansion mode at low equivalent explosive masses and local inner concave mode at large equivalent explosive masses, respectively. Interestingly, a counter-intuitive phenomenon is observed on the loaded boundary of the H-RP. Besides, the energy distribution and buffering capacity of different parts on the honeycomb models are discussed. In a unit cell, most of the energy is absorbed by the edges with an edge thickness of 0.04 mm while little energy is absorbed by the other bilateral edges. For the buffering capacity, the honeycomb in the direction behaves better than that in the direction.
轻质铝蜂窝是一种用于抵御动态冲击和爆炸的缓冲及能量吸收结构。采用具有不同当量炸药质量的直接爆炸和间接爆炸来研究铝蜂窝的面内变形特性和能量吸收分布。建立了两种蜂窝有限元模型，即刚性板 - 蜂窝 - 刚性板（RP - H - RP）模型和蜂窝 - 刚性板（H - RP）模型。模型表明，对于RP - H - RP模型，在 方向上存在三种变形模式，分别是低当量炸药质量下的整体响应模式、中等当量炸药质量下的过渡响应模式以及高当量炸药质量下的局部响应模式。同时，蜂窝在 方向上呈现两种变形模式，即低当量炸药质量下的膨胀模式和高当量炸药质量下的局部内凹模式。有趣的是，在H - RP模型的加载边界上观察到了一种与直觉相反的现象。此外，还讨论了蜂窝模型不同部位的能量分布和缓冲能力。在一个单胞中，大部分能量被厚度为0.04 mm的边缘吸收，而其他双边边缘吸收的能量很少。对于缓冲能力，蜂窝在 方向上的表现优于在 方向上的表现。
