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Study on the Tensile Properties of Bamboo/Ramie Fiber Fabrics and Textile Composites

Author: ZhaoLiZuo
Tutor: ZhangShuangBao；WangGe
School: Beijing Forestry University
Course: Wood Science and Technology
Keywords: ramie fiber bamboo fiber biaxial tensile textile structural composites 3D tensile tensile properties
CLC: TB332
Type: Master's thesis
Year: 2010
Downloads: 150
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Abstract


Bamboo and ramie yarn、textile and their textile structural composites were used as experimental materials in this paper. Mainly measured the tensile properties, introduced biaxial tensile method of textile and textile structural composites. By Successive Shooting during the stretching process, the longitudinal and latitudinal deformation and crack propagation can be observed clearly. So we can confirm the failure position and mechanism so as to evaluate the mechanical properties more accurately.(1) By the study of tensile properties of warp and weft yarns, conclusions were obtained:when the warp and weft yarn fineness of textile were same, yarns in different direction would have the same breaking strength, and longitudinal breaking elongation was shorter latitudinal than longitudinal yarns. The breaking strength of 7.5Nm ramie yarns were warp 324.11 MPa≈weft 342.64MPa, the longitudinal breaking elongation of them were warp 6.72%<weft 9.49%; the breaking strength of 13.5Nm ramie yarns was warp 389.51≈392.30MPa, the longitudinal breaking elongation of them were warp 6.98%<weft 8.56%; the breaking strength of 6Nm bamboo yarns was warp 104.16MPa≈weft 105.67MPa, the longitudinal breaking elongation of them were warp 3.88%<weft 3.94%.(2) By the study of uni-axial tensile properties of fabric, conclusions were obtained:when the warp and weft yarn fineness of textile were same, the breaking strength would increase as the density enhanced. Warp and weft yarn density of 7.5Nm ramie fabric were warp 117 roots/10cm>113 roots/10cm, breaking strength of them were warp 652.88 N>weft 651.24 N. The longitudinal breaking strength of 13.5Nm ramie fabric and 6Nm/2 bamboo fabric were 526.39N、428.78N, the relationship between density and breaking strength was same as 7.5Nm ramie fabric. Generally speaking, the breaking strength and elongation was proportional to the strength and elongation of axial yarns: breaking strength of three types of yarns were bamboo 104 MPa<ramie 333 MPa and 391MPa, so breaking strength of 6Nm/2 bamboo fabric was the least, fracture force in longitude and latitude directions were 428.78N and 243.37N. The longitudinal breaking elongation of 7.5Nm ramie yarns were warp 6.72%<weft 9.49%, longitudinal breaking elongation of 7.5Nm ramie fabrics were warp 7.06%<weft 21.91%. It also applies on 13.5Nm ramie yarns and fabrics.(3) Fabric with warp and weft structure is a whole. Biaxial tensile of cross-conical samples can evaluate the tensile properties of textile more objectively and accurately.(4) Breaking strength and elongation of fabric both increased by biaxial tensile compared with uni-directional stretching. Textile tended to be broken in the direction of shorter elongation and lower strength. The breaking strength of 7.5Nm ramie fabric is biaxial 751.79N>uni-directional 652.88 N, breaking elongation of it is biaxial 8.76%>uni-directional 7.06%. The breaking strength and elongation biaxial tensile of 13.5 Nm ramie fabric and 6Nm/2 bamboo fabric were:527.83N、8.81%; 281.78N、17.35%, the relationship between strength and elongation was same as 7.5Nm ramie fabric; When the textile were subjected to complicated loading states (such as knee and elbow),3D tensile was more objectively. The breaking strength of 7.5Nm ramie fabric by 3D tensile decreased by 7.5% compared with biaxial tensile and the breaking elongation increased by 3.2%; the breaking strength of 13.5Nm ramie fabric by 3D tensile decreased by 6.1% compared with biaxial tensile and the breaking elongation increased by 19.5%.(5) Properties of fabric will change after washing. The breaking strength of fabric decreased and elongation increased after times of washing, longitudinal strength decreased more quickly. After eight times of washing, the longitudinal strength of 7.5Nm ramie fabric and 13.5Nm ramie fabric decreased by 26.2%and 16.1%, the breaking elongation of them increased by 140% and 181%.(6) By the study of tensile properties of fabric structured composites, conclusions were obtained: the mechanical property of composites was influenced by layers of fabric, types and content of resin, manufacturing process. On a certain manufacturing process, the mechanical strength of composites enhanced with the increased layer number of it. Also, the property of composites impregnated by epoxy resin was more superior than that impregnated by phenol-formaldehyde resin. The breaking strength of 7 layers composites, reinforced by 7.5Nm ramie and 13.5Nm ramie fabric, impregnated by phenol-formaldehyde resin, were 4827.09N and 4732.54N respectively. Because of mixed effect of matrix and intensifying material, the breaking strength of composites was more superior than that of fabric.(7) Property of fabric was improved by resin, so the performance difference of composite decreased. The strength ratio of 7.5Nm ramie and 13.5Nm ramie fabric to 6 Nm/2 bamboo fabric were 1.87、2.67; The strength ratio of 7.5Nm ramie and 13.5Nm ramie composites to 6 Nm/2 bamboo composite were 1.48、1.01.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Non-metallic composite materials
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