The compressive response of carbon fiber composite pyramidal truss sandwich cores

By K. Finnegan, G. Kooistra, H. Wadley, V. Deshpande. International Journal of Materials Research - Zeitschrift für Metallkunde, 2007

226 citations recorded by the source corpus.

Abstract Pyramidal truss sandwich cores with relative densities in the range 1 – 10 % have been made from carbon fiber reinforced polymer laminates using a snap-fitting method. The measured quasi-static uniaxial compressive strength increased with increasing from 1 to 11 MPa over the relative density range investigated here. A robust face-sheet/truss joint design was developed to suppress truss – face sheet node fracture. Core failure then occurred by either (i) Euler buckling () or (ii) delamination failure () of the struts. Micro-buckling failure of the struts was not observed in the experiments reported here. Analytical models for the collapse of the composite cores by Euler bucking, delamination failure and micro-buckling of the struts have been developed. Good agreement between the measurements and predictions based on the Euler buckling and delamination failure of the struts is obtained. The micro-buckling analysis indicates this mechanism of failure is not activated until delamination is suppressed. The measurements and predictions reported here indicate that composite cellular materials with a pyramidal micro-structure reside in a gap in the strength versus density material property space, providing new opportunities for lightweight, high strength structural design.

Subfields: Mechanical Engineering, Mechanics of Materials

View Paper: https://www.semanticscholar.org/paper/f4ff946af3ab18605ace98bd7336988dc8cfd0f6

How researchers see this paper

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In Mechanical Engineering

1. H. Wadley
2. Liang Dong
3. Lin-zhi Wu
4. Li Ma
5. V. Deshpande
6. Bing Wang
7. M. O’Masta
8. L. St-Pierre

In Mechanics of Materials

1. H. Wadley
2. Lin-zhi Wu
3. Li Ma
4. Bing Wang
5. Liang Dong
6. J. Xiong
7. Ashkan Vaziri
8. V. Deshpande

Citations in the corpus

• Fabrication and crushing behavior of low density carbon fiber composite pyramidal truss structures (2010, methodology): “…E-mail addresses: xiongjian0309@163.com (J. Xion Please cite this article in press as: Xiong J et al. F pos Struct (2010), doi:10.1016/j.compstruct.201 a b s t r a c t A new method for fabricating carbon fiber composite pyramidal truss cores was developed based on the molding hot-press technique.”
• The fracture toughness of octet-truss lattices (2017, methodology): “Fabrication of millimeter scale octet truss lattices has been accomplished using a snap-fit method (Dong et al., 2015; Dong and Wadley, 2015; Finnegan et al., 2007), a reverse assembly technique(Cheung and Gershenfeld, 2013), and an investment casting approach (Deshpande et al.”
• Mechanical response of Ti–6Al–4V octet-truss lattice structures (2015, methodology): “, 2011), octet truss (Bitzer, 1997; Fuller, 1961) and pyramidal (Kooistra, 2007; Queheillalt, 2005; Finnegan et al., 2007; Queheillalt et al., 2008) arrangements of webs or struts.”
• Mechanical behavior of the sandwich structures with carbon fiber-reinforced pyramidal lattice truss core (2010, methodology): “[22] manufactured carbon fiber composite pyramidal truss cores using conventional method to bond the cores to the facesheets.”