Shear response of carbon fiber composite octet-truss lattice structures
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- 作者：Liang Dong ; ld5fy@virginia.edu" class="auth_mail" title="E-mail the corresponding author ; Haydn Wadley
- 关键词：A. Sandwich structures ; A. Polymer-matrix composites (PMCs) ; B. Mechanical properties ; E. Assembly
- 刊名：Composites Part A: Applied Science and Manufacturing
- 出版年：2016
- 出版时间：February 2016
- 年：2016
- 卷：81
- 期：Complete
- 页码：182-192
- 全文大小：3892 K
文摘
Ultralight three dimensional space filling octet-truss lattice structures have been fabricated from carbon fiber reinforced polymer (CFRP) laminates using a mechanical snap-fitting and adhesive bonding technique. The lattice structures moduli and strengths have been measured during (0 0 1) in-plane shear as a function of the lattice relative density (
). Their strength was determined by the activation of two strut failure modes: elastic buckling of the struts governed the response when , while delamination failure controlled the strength for . The measured shear strengths are shown to be well predicted by micromechanics models based on the elastic buckling and delamination failure of the struts. Snap-fit CFRP octet-truss lattice structures with densities of 24–230 kg m−3 are found to have mechanical properties superior to polymer and metal foams, and are competitive with Balsa wood and recently reported Ti–6Al–4V octet-truss lattices. They provide new opportunities for ultra-lightweight multi-axially loaded structures.
). Their strength was determined by the activation of two strut failure modes: elastic buckling of the struts governed the response when , while delamination failure controlled the strength for . The measured shear strengths are shown to be well predicted by micromechanics models based on the elastic buckling and delamination failure of the struts. Snap-fit CFRP octet-truss lattice structures with densities of 24–230 kg m−3 are found to have mechanical properties superior to polymer and metal foams, and are competitive with Balsa wood and recently reported Ti–6Al–4V octet-truss lattices. They provide new opportunities for ultra-lightweight multi-axially loaded structures.