Studies On Experimental Methods Under Biaxial Tensile And Mechanical Properties Of Woven Fabric

The fracture mode of fabrics was complicated during the actual application, and in tensile properties, it contained uniaxial and biaxial extension. For the limit of the instrument and experimental method, there was rare research in the biaxial tensile of fabric in China. This paper was to study experimental techniques of woven fabrics under biaxial extension, in order to provide basics for the comprehensive assessment of fabric fracture under complicated loading conditions and also make reference for the fabric structural design of better mechanical properties.First, the common mechanical properties were discussed, as well as the biaxial properties when one direction was fixed, the other was in tension. Second, by the means of Digital Spackle Correlation Method (DSCM), the experimental methods of biaxial loading were investigated on Mechanical Analysis System of Three-Dimensional Composites. Third, the behavior of the woven fabric with different fabric construction and density under both uniaxial and biaxial tensile were studied. The results showed that: there were relations among bursting, tearing, and stretching properties; cruciform specimen with circular arc at the corners was chose, the clamp zone, transition zone and the corners of the specimen were reinforced by pasting lapping cloth, which should have a greater elongation and less tensile strength than the sample. In the aspect of experimental parameters, pre-tension was 5N, tension gauge was 100mm, the biaxial tensile rate was 50mm/min. Biaxial tensile curve and sample damage showed the experimental method satisfied the evaluation principles. In structure parameters, when filling density increased, the bursting and tensile strength in weft under uniaxial and biaxial increased, the tearing strength in weft and tensile strength in warp decreased, the fabric was equal to isotropic when the density ratio was about 1:1.1. The strength under common and biaxial loading of plain weave was the biggest, more than twill weave, and sateen weave was the least.