Abstract
In this study, 11 kinds of composite material were prepared, and the compression behavior of a bi-directional corrugated lattice sandwich structure prepared using jute fiber and epoxy resin was explored. The factors affecting the mechanical behavior of single and double-layer structures were studied separately. The results shows that the fiber angle, length-to-diameter ratio of the struts, and the type of fiber cloth have the most significant influence on the mechanical behavior of the single-layer lattice structure when preparing the core layer. When the fiber angle of the core layer jute/epoxy prepreg is (90/90) the compressive strength and Young’s modulus are 83.3% and 60.0% higher than the fiber angle of (45/45). The configuration of the core and the presence of the intermediate support plate of the double-layer structure have a large influence on the compression performance of the two-layer structure. After the configuration was optimized, the compressive strength and Young’s modulus were increased by 40.0% and 28.9%, respectively. The presence of the intermediate support plate increases the compressive strength, and Young’s modulus of the double-layer structure by 75.0% and 26.6%, respectively. The experimental failure is dominated by the buckling, fracture, and delamination of the core struts.
Highlights
Lattice sandwich structures have high specific strength and specific stiffness
The theoretical predictions were compared with the experimental predictions
The theoretical predictions were compared with the experimental results, and the results, and the following were drawn: following conclusions wereconclusions drawn: 1
Summary
Lattice sandwich structures have high specific strength and specific stiffness. in recent years, the lattice structure of man-made fiber-reinforced composites has been studied extensively [1,2,3,4,5]. Materials 2018, 11, 2578 the lattice sandwich structure by man-made fibers is lighter and stronger, and the connectivity of the core space is more conducive to the secondary development and application of the core layer structure. These advantages make the lattice sandwich structure have great application prospects. Existing research on biomass materials are mainly applied to the traditional sandwich structure designs, and the discontinuity of the core space is unfavorable for the development of composite functions. Natural fibers are designed to develop lattice sandwich structures that enable secondary design and application of the space left by the core layer. The failure mechanism is discussed and an analytical derivation is made
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