Experimental Study on Tensile Mechanics of Arrow Combination Structure with Carbon Fiber–Epoxy Resin Composite

Abstract

To obtain the tensile mechanics of the arrow combination structure with carbon fiber–epoxy resin composite, the quasi-static experiments were carried out in this paper. Firstly, the concave hexagon single-cell structure and star single-cell structure were designed, and the tensile force–displacement characteristics of the two structures were obtained by cyclic loading and single loading experiments. The mechanism of the “step effect” on the force–displacement curve was analyzed, and the failure mode of the two structure was emphatically investigated. Then, the stress–strain relationship of the structures was drawn, and the constitutive model of representative elements was established. The energy absorption and specific energy absorption of the two structures were calculated, too. The results show that the concave hexagonal single-cell structure has a higher stiffness (about 2.2 times of the star single-cell structure), but the star single-cell structure has a better plastic deformation range (about 2.2 times of the concave hexagonal single-cell). On the whole, the concave hexagonal single-cell structure has the linear elastic characteristics, but the star single-cell structure has the elastic–plastic characteristics and the strengthening stage is obvious. The specific energy absorption of concave hexagonal single-cell structure is 5/8 of the star single-cell structure.