Study On Mechanical Properties Of Bio-inspired Laminated Structure Fiber Composites

The dactyl club of mantis shrimp is composed of helical mineral fibers arranged in the periodic zone and herringbone impact zone,which has good energy absorption and damage capacity.This natural biological structure provides new inspiration for the creation of energy-absorbing and damage-resistant laminated structures.Bio-inspired laminated structure fiber composite is a kind of fiber composites based on basalt fiber,resin,aluminum honeycomb,and other materials.In this paper,natural and environmentally friendly basalt fiber is used as a reinforcing material,and various structures of the bionic laminated structure composite material are made by changing the core layer and the surface layer structure by imitating the dactyl club to improve the structure's energy absorption and resistance to damage.The contents of this paper are as follows:1.By using the continuous basalt fiber and the chopped basalt fiber to simulate the structural properties of the period and impact region of mantis shrimp's dactyl club.A dactyl-inspired composite material with continuous basalt fibers as an upper and lower layer and chopped basalt fibers as the core layer was prepared.At the same time,under the same manufacturing process,basalt plain-woven fiber and chopped basalt fiber were used to prepare traditional fiber composite materials and chopped fiber composite materials.These three structures were prepared by compression molding using basalt fiber as a reinforcing material,and a resin paste composed of epoxy resin,shrinkage agent,filler and the like as a matrix.Through the methods of impact,flexural,compression test and microscopic analysis,it is concluded from the failure mechanism and mechanical properties that the material of the bionic laminated structure can deflect cracks,enhance the structure's ability to absorb energy,and resist damage.2.The helical structural fiber sheet was fabricated by using the basaltunidirectional fiber to imitate the periodic region of mantis shrimp's dactyl club,and the aluminum honeycomb was used as the core layer instead of the chopped basalt fiber.Finally,a dactyl-inspired honeycomb laminated structure was produced.The addition of aluminum honeycomb can greatly improve the structure's resistance to bending and impact.At the same time,basalt plain-woven fibers and basalt unidirectional fibers were used to make fiber composite materials with traditional structures as the face-sheet of laminated honeycomb structure.Through the impact,flexural,compression test and microscopic analysis of these three structures.From the aspects of failure mechanism and mechanical properties,it is concluded that compared to traditional laminated honeycomb structures,the dactyl-inspired laminated structure composites have higher energy absorption and resistance to damage.3.In order to further improve the resistance to damage and buckling of the bionic laminate structure composite,its structure was optimized.Aluminum honeycomb was used as the core layer,and the upper and lower skins were processed by basalt unidirectional fibers by imitating the periodic and impact regions of the dactyl club.Finally,a dactyl-inspired sinusoidal-corrugated helicoidal honeycomb laminated structure composite was produced.At the same time,for the purpose of performance comparison,bio-inspired sinusoidal-corrugated honeycomb panels without helical arrangement were fabricated using basalt plain fiber and basalt unidirectional fiber based on the impact region of dactyl club.The three types of honeycomb panels were discussed through impact,flexural,compression test,and microscopic analysis.It is concluded that the sinusoidal skin can improve the damage resistance of laminated composites.The dactyl-inspired sinusoidal-corrugated helicoidal honeycomb laminated structure composite has higher strength and ability to absorb energy compared with the sinusoidal-corrugated laminated honeycomb panel.