Ashab A S M Ayman, Ruan Dong, Lu Guoxing, Bhuiyan Arafat A
Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia.
Materials (Basel). 2016 Mar 4;9(3):162. doi: 10.3390/ma9030162.
The mechanical behavior of aluminum hexagonal honeycombs subjected to out-of-plane dynamic indentation and compression loads has been investigated numerically using ANSYS/LS-DYNA in this paper. The finite element (FE) models have been verified by previous experimental results in terms of deformation pattern, stress-strain curve, and energy dissipation. The verified FE models have then been used in comprehensive numerical analysis of different aluminum honeycombs. Plateau stress, , and dissipated energy ( for indentation and for compression) have been calculated at different strain rates ranging from 10² to 10⁴ s. The effects of strain rate and ratio on the plateau stress, dissipated energy, and tearing energy have been discussed. An empirical formula is proposed to describe the relationship between the tearing energy per unit fracture area, relative density, and strain rate for honeycombs. Moreover, it has been found that a generic formula can be used to describe the relationship between tearing energy per unit fracture area and relative density for both aluminum honeycombs and foams.
本文利用ANSYS/LS-DYNA对铝质六边形蜂窝结构在面外动态压痕和压缩载荷作用下的力学行为进行了数值研究。有限元（FE）模型已通过先前实验结果在变形模式、应力-应变曲线和能量耗散方面得到验证。经验证的有限元模型随后被用于不同铝质蜂窝结构的综合数值分析。在10²至10⁴ s的不同应变率下计算了平台应力和耗散能量（压痕时为 ，压缩时为 ）。讨论了应变率和 比对应力平台、耗散能量和撕裂能量的影响。提出了一个经验公式来描述蜂窝结构单位断裂面积的撕裂能量、相对密度和应变率之间的关系。此外，还发现一个通用公式可用于描述铝质蜂窝结构和泡沫材料单位断裂面积的撕裂能量与相对密度之间的关系。
