Off-axial failure analysis of polytetrafluoroethylene-coated woven glass fibers under different loading rates

Abstract

This paper presents the research on off-axial tensile behaviors of polytetrafluoroethylene-coated woven glass fibers under different loading rates. First, groups of off-axial tensile tests were carried out, and the corresponding failure mechanisms were analyzed. Then, the effect of loading rate on the tensile behaviors of off-axial specimens was studied. Finally, several current strength criteria were compared to predict the material failure strength under different loading rates. Results show the tensile behaviors of polytetrafluoroethylene-coated woven glass fibers are typical orthotropic. The material failure strength is strongly related with failure modes and yarn orientations. Three typical failure modes are observed in the tests, including interface failure, yarn breakage, and composite failure. The loading rate has significant effects on the material tensile strength and the elongation at break. With loading rate increasing, the tensile strength increases and the elongation at break decreases. The tensile strength shows a good linear correlation with the loading rate's logarithm. Most of current quadratic strength criteria can be used to predict the material failure strength, except for the specimens of small bias angles. This is because traditional quadratic criteria are always based on the strain energy theory of homogeneous materials, which may not reflect the failure mechanisms of coated fabrics and other important details.

Influence of Water-Induced Degradation of Polytetrafluoroethylene (PTFE)-Coated Woven Fabrics Mechanical Properties

“…Wang et al [ 43 ] carried out the cycling-uniaxial tensile tests based on the mono-uniaxial tensile experiments. Junhao et al [ 44 ] investigated off-axial tensile behaviors of polytetrafluoroethylene-coated woven glass fibers under different loading rates. Żerdzicki et al [ 45 ] presented the mechanical response of the VALMEX fabric during the cyclic loading-unloading and reloading experiments.…”

Influence of water soaking on the ultimate tensile strength of polyester-based coated woven fabrics

“…The literature concerning the subject of architectural fabrics investigations is very extensive. Performed investigations of the coated woven fabrics have shown that the mechanical parameters are highly influenced by temperature changes [13][14][15]; changes in behaviour under uniaxial, biaxial and creep loadings [16][17][18][19][20][21]; glass threads based and PTFE-coated woven fabrics occur a reduction in the tensile strength resulting under waterlogged [22,23]; prove degradation of the tensile strength exposed to weathering and ageing impacts and cyclic loading [24][25][26][27]; exhibits highly material nonlinearity with identified viscoelastic, viscoplastic behaviour [28][29][30][31][32][33][34]; puncture resistance strength increases with the increase of weight percentage of fibres and initial notch significantly reduce the ultimate strength [35][36][37][38]; the failure strength depends on the stress ratio and off-axial angle [39][40][41][42]. The investigations are also performed on: tearing behaviours and tearing strength propagation mechanisms [41,[43][44][45][46], off-axis tearing properties [47,48], achieving 3D strain surfaces on coated woven fabrics, and refined biaxial test procedures [49,50], modelling multi-scale progressive dam...…”

Numerical simulation and experimental study of off-axis tensile performance of triaxial woven fabric reinforced rubber composites

“…Niwa et al 8 studied the anisotropic tensile properties of plain weave fabrics experimentally and found that plain weave fabrics exhibited substantially lower tensile strength in the direction of angle bisector of yarns than along the yarn axis direction. Junhao et al 9 investigated the effects of off-axis loading angles and rates on the tensile properties of coated fabrics and analyzed the failure modes. They found that the mechanical properties of coated fabrics were strongly related with loading rates and yarn orientations.…”