Research On Impact Resistance Of Structural Bionic Basalt Fiber Reinforced Composite

There are many biological tissue structures with excellent mechanical properties in nature,such as the double-twisted Bouligand structure of the scales of coelacanth,the sinusoidal-helix multi-zone structure of the dactyl club of mantis shrimp and the sandwich structure of the red-eared tortoise shell.These kind of coupling structures allows biological organs to have the characteristics of impact resistance,and provides a new idea for the manufacture of laminated materials and sandwich materials with excellent impact resistance.In this paper,basalt fiber is used as a reinforcing material which is a natural non-polluting high-performance fiber,and a variety of bionic coupling structure composite materials are designed and formed by simulating the layup method and spatial structure of the above biological coupling structure in order to improve the impact resistance of the material,and exploring the damage mode of the material.The specific research content of this article is as follows:1.In order to improve the impact resistance of the laminated materials,we applied the double-twisted Bouligand structure of coelacanth scales to the manufacture of basalt fiber laminated materials.The laminates of the bionic structure and the traditional structure are formed by hot pressing the unidirectional basalt fiber prepreg,and the corresponding finite element analysis model is established.The low-speed impact test and finite element simulation calculation are carried out under gradient impact energy to obtain the material resistance data related to impact performance and analysis of damage results.Under different energies,the maximum contact force of the inter-group orthogonal and between-group helical coupling double-twisted Bouligand tine laminated materials is 2.42%-9.97%?11.53%-23.74%?48.56%-68.94% higher than other structural materials.The spiral coupling bionic structure between groups combines the advantages of these two structures,making it more difficult for damage to occur and crack propagation,and therefore has better impact resistance.2.By coupling the sinusoidal structure of the impact zone and the spiral structure of the periodic zone of the dactyl club of the mantis shrimp in the manufacture of basalt fiber laminates,it breaks through the traditional design of flat laminates to improve the impact resistance of the laminates.Using unidirectional basalt fiber prepreg,the laminates of bionic structure and traditional structure were formed by hot pressing,and the corresponding finite element analysis model was established.Low-speed impact test and finite element simulation calculation were carried out under fixed impact energy to obtain the impact resistance of the material performance related data and damage result analysis.The maximum contact force of the sinusoidal-spiral coupling structure laminated material is 13.00%?108.05%?65.29% higher than other structural materials.Its sinusoidal structure has good cushioning performance,and the spirally laid fibers increase the difficulty of damage extend.So the degree of damage is the lowest and the impact resistance is the best.3.By applying the heterogeneous skin sandwich structure of the red-eared tortoise shell to the manufacture of basalt fiber sandwich materials,the impact behavior response of sandwich materials with different skin structures is analyzed to improve the impact resistance of the sandwich materials.The use of unidirectional basalt fiber prepreg and aluminum honeycomb hot-press forming and step-by-step forming of the sandwich material of the bionic structure and the traditional structure,and established the corresponding finite element analysis model,and carried out the low-speed impact test and the limited impact under the fixed impact energy,obtain the relevant data of the material's impact resistance and analysis of the damage results.Compared with other structural materials,the maximum contact force of the sandwich material of the coupling structure of the upper skin double twisted,the lower skin orthogonal,and the core layer aluminum honeycomb is higher by 9.44%?24.75%?16.19%,respectively.The honeycomb structure is not crushed,the bionic structure skin can concentrate the stress on the impact area,the overall structural integrity is the best,and the impact resistance is the best.