Abstract:

For complex stress issues of fabric under practical working environment, mechanical properties of ramie textile were investigated under uniaxial and biaxial directions, bursting and three-dimensional load, and the strain fileds of different force bearing modes were characterized by using digital speckle correlation. The poisson ratio is 0.3114, warpwise and weftwise elastic modulus is 6624 N/m, and 2656 N/m respectively under biaxial load. Breaking strength under uniaxial force is larger than that in warpwise, but smaller than that in weftwise. Coefficient of variations in both warp-and weftwise are larger when compared with unaxial tension. X direction strain-field under biaxial load fluctuations lies between unaxial tensions of weft and warp. Covariance and correlation analysis showed that the difference of bursting strength under three-dimensional load was primarily determined by bursting ways, correlation coefficient between breaking strength of warp and weft is -0.613. Partial correlation analysis showed that there is 13.72% generated by synergy effects of bursting strength.