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Fig. 5 shows the behavior when the face sheets of the sandwich are not present. It is just a lattice cylindrical “shell”. The next image, Fig. 6, shows the behavior when the face sheets are present.
This and the next image are from:
Liming Chen (1,2,3), Jian Zhang (1,2), Bing Du (1,2), Hao Zhou (4), Houchang Liu (1,2), Yongguang Guo(1,2), Weiguo Li (1,2) and Daining Fang (5)
(1) College of Aerospace Engineering, Chongqing University, Chongqing 400030, China
(2) Chongqing Key Laboratory of Heterogeneous Material Mechanics, Chongqing University, Chongqing 400030, China
(3) State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, China
(4) Beijing Key Laboratory of Intelligent Space Robotic Systems Technology and Applications, Beijing Institute of Spacecraft System Engineering, Beijing 100094, China
(5) Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China
“Dynamic crushing behavior and energy absorption of graded lattice cylindrical structure under axial impact load”, Thin-Walled Structures, Vol. 127, pp 333-343, 2018
ABSTRACT: Dynamic behavior of lattice cylindrical structures with triangular and hexagonal configurations subjected to constant velocity impact was studied theoretically and numerically. The dynamic plateau stress of lattice cylindrical shell was well predicted by analytical predictions based on the one-dimension shock theory. The uniform and density gradient lattice cylindrical structures were investigated using finite element models. It was found normalized plastic energy absorption was significantly affected by relative density for two kinds of lattice cylindrical shells. And the ratio of cell wall to skin thickness was found the vital factor determining the specific energy absorption and deformation modes of lattice sandwich cylindrical shell. By introducing density gradient along crushing direction, the results showed that, for lattice cylindrical shell, introducing positive density gradient can enhance energy absorption at the early stage in high velocity. For lattice sandwich cylindrical shell, introducing density gradient can efficiently reduce the peak crushing force but have little effect on the energy absorption.
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