The Preparation And Mechanical Properties Of Flexible Warp-knitted Metal Mesh

The metal mesh materials have light weight,high strength and stable structure.The metal materials also have the advantages of high reflectivity and strong wavelength.The metal fabrics are used in a special field generally,which have the characteristics of traditional textiles and metal products.With the increasing demand of flexible warp-knitted metal mesh in aerospace manufacturing,chemical industry and construction industry,the structural design and basic mechanical properties of warp-knitted metal mesh fabrics meet the current market.Researchers need to solve the problem of precision of warp-knitted metal mesh structure and high stability of mechanical properties.In this paper,the raw material was 316 L stainless steel wire with 0.05 mm diameter.The metal mesh structure process was designed by WKCAD.The uneven tension of single stainless steel wire was mainly solved by the warping and knitting procedure,so as to improve the dimensional stability of metal mesh structure,which provided help for the design of related warp-knitted mesh fabric.Secondly,based on the two-comb warp-knitted metal mesh fabric,the unidirectional tensile properties,tearing properties,bursting properties of the flexible metal mesh fabric were explored.Taking different speed and direction as variable factors,the quantitative correlation between speed and direction on the mechanical strength of warp-knitted metal mesh was studied.According to the geometric shape,structural and material of the warp-knitted metal mesh,the relationships between elongation and strength were studied.The failure morphology and deformation characteristics of the sample were observed.The results show that the anisotropy of warp-knitted metal mesh along the X-axis,Y-axis and Z-axis was quite different,because the lining structure greatly limited the ductility of warp knitted metal mesh in the X-axis direction.The clamping area and the size of the bursting head had a certain influence on the bursting performance of the metal mesh.Under the same clamping area,the flexible warp-knitted metal mesh was more resistant to bursting of larger objects,which could provide reference for the strength,stiffness and stability of related structural materials.Then,the mechanical behavior of the warp-knitted metal mesh under biaxial stress loading was explored.Taking different stress loading angles as variables,the relationship between the mechanical properties of specimens and the effective elastic modulus of anisotropic structures under different stress loading conditions were analyzed.The results showed that the direction of stress load directly affected the mechanical properties of the warp-knitted metal mesh.There was a linear relationship between the effective elastic modulus and mechanical properties of the warp-knitted metal mesh in different stress directions.It helped to better reversely optimize the design of isotropic structures and improve application performance,which provided the foundation for the development of more applicable fields.At last,we used a low-velocity impact instrument to carry out low-velocity impact test on the metal mesh with different initial energies.We observed the failure mode,energy absorption and energy dissipation of the warp-knitted metal mesh under low-velocity impact load.What's more,on the basis of the above-mentioned two-dimensional coordinates of the coils,the three-dimensional coordinates of the two-comb warp-knitted structure coils were deduced,the model of the flexible warp-knitted metal mesh was established.The low-velocity impact test of the metal mesh was simulated by Abaqus software.The dynamic response of the two-comb warp-knitted metal mesh under different initial energies is verified by numerical simulation.The results showed the flexible warp-knitted metal mesh produced adaptive variable stiffness stress at the beginning,the deformation work absorbed the impact energy,the influence of the deformation system was the key factor of the failure for the metal mesh.The failure mode and impact response of metal mesh were analyzed by combining finite element method with experiment.The impact resistance was evaluated by the deformation of the sample after impact test.It can effectively prevent the material from serious damage caused by impact in actual life.This study provided a theoretical basis for practical research of flexible warp-knitted metal mesh.This study expanded its development in shotcrete support,flexible wearable electronic equipment,satellite antenna,water filter wall and other application fields.