The effect of structural parameters on the tensile and shear properties of 3D woven composites
To investigate the relationship between the parameters of Three-dimensional(3D)woven structures and the mechanical properties of composites,four structures of 3D woven fabrics were prepared,including shallow cross-linked,layer-by-layer angle-interlock,"stitching weft"weft knitted and"stitching weft"weft knitted+inserted weft structures.They were prepared into composites,and by using a material testing machine,the effects of structural parameters on tensile and shear properties of the composites were explored.The results show that with the same fiber volume fraction,the yarn crimp and the interlacing structure of yarns determine the tensile properties and dimensional stability of the composites.In the warp direction,the shallow cross-linked woven composites exhibit the most excellent tensile properties and dimensional stability,while the"stitching weft"weft knitted+inserted weft reinforced composites with large warp crimp attain the worst tensile performance.In the weft direction,the structure"stitching weft"weft knitted reinforced composites still exhibit the worst tensile property and discreteness.Comparison of the tensile properties in both directions indicates that the tensile property of the composites in the weft direction is superior to that in the warp direction.The interlacing structure of the fabrics determines the shear properties and dimensional stability.The shallow cross-linked composites perform the highest shear modulus with a dense structure,while the"stitching weft"weft knitted composites with a looser structure result in a lowest shear modulus.However,the shear strength shows an almost opposite law.This study clarifies the effects of the structural parameters such as fiber volume fraction,yarn crimp degree,and fabric interlacing structure on the tensile and shear properties of 3D woven composites,providing reference for the research and application of 3D woven composites.
NETL
NSTL
万方数据
维普
