International Journal of Aerospace and Lightweight Structures

doi: 10.3850/S2010428612000293

Three-point Bending Properties of Composite Lattice Sandwich Structures with Tetrahedral Truss Cores

Jia Lou, Bing Wang ,Li Ma and Linzhi Wu^* Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150001, PR China. ^*wlz@hit.edu.cn

ABSTRACT

The mechanical properties of carbon fiber composite lattice sandwich structures with tetrahedral truss cores under three-point bending are studied in the present paper. Considering the joint effect of bending of the face sheets and shear of the core, the deflection response of the sandwich structure is derived. The stresses within the face sheets and the truss members are calculated respectively, and the corresponding failure modes are analyzed. Then, collapse mechanism map is conducted to obtain the configuration with the highest mass efficiency. The entire family of optimized designs of composite lattice sandwich structures with tetrahedral truss cores is carried out. It is found that the optimized composite lattice sandwich structures have higher mass efficiency as compared to metallic lattice sandwich structures and composite solid plates. The structural optimized design has a guiding significance for engineering.

Keywords: Composites, Lattice sandwich structures, Three-point bending, Failure modes, Optimized design.

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