In-plane crushing behaviors of piecewise linear graded honeycombs. (1st January 2019)

• Record Type: Journal Article
• Authors: Li, Zhen; Jiang, Yi; Wang, Tao; Wang, Liangmo; Zhuang, Weichao; Liu, Dan
• Is Part Of: Composite structures. Volume 207(2019)
• Page Start: 425
• Page End: 437
• Publication Date: 2019-01-01
• Subjects: Piecewise linear graded honeycombs -- Crushing behaviors -- Cell-wall angle -- Cell-wall thickness -- In-plane loadings -- Finite element method; Composite construction -- Periodicals; Composites -- Périodiques; 624.18
• DOI: 10.1016/j.compstruct.2018.09.036
• Languages: English
• ISSNs: 0263-8223

Abstract

Abstract: The cell-wall thickness induced and cell-wall angle induced piecewise linear graded honeycombs (PLGHs) are presented and investigated under in-plane compression. Effects of cell-wall angle on the strength of honeycombs are discussed. Results reveal that the normalized crushing strength displays similar variety to that of the shape ratio within a given range. Based on this, traditional theoretical models of plateau stresses are improved. Comparative studies on different kinds of PLGHs are conducted. Quasi-static and dynamic deformation mode, strength and energy absorption capacity are intensively discussed. Both weak-to-strong and top-to-bottom layer-by-layer deformation mode are observed. Comparison of strain-stress curves shows that cell-wall angle induced PLGHs generally express lower level of stress than that of cell-wall thickness induced PLGHs under quasi-static compression, but the difference is insignificant as the crushing velocity increases. Theoretical prediction is also conducted to estimate the stress level under quasi-static and high crushing velocities. Both the constant velocity and initial velocity loadings are applied to studying the energy absorption capacity. It is interesting to note that cell-wall angle induced PLGHs shows a time saving characteristic as the normalized initial kinetic energy increases from 0.75 to 1, which has not been discovered in other types of honeycombs.