Modified stress field model for critical tearing strength of architectural coated fabrics

Abstract

This report presents a new critical tearing strength prediction model, the modified stress field model. Firstly, the critical tearing strength of six coated fabrics is obtained using the single-edge notched tests. The results show that the warp and weft strength utilization of different coated fabrics is similar. Based on the test data, the prediction effects, parameter meanings, and basic properties of three models, namely Thiele’s empirical formula, the stress field model, and the modified stress field model, are discussed and compared. Then, the predicted results and properties of the three models in different crack ranges, specifically the small crack range, are compared, and their application scopes are verified. The two commonly used models lack the improved prediction effects in the small crack range that is provided by the modified stress field model. Finally, to reduce the workload while maintaining a certain accuracy, a crack combination of 3 mm + 15 mm is recommended, which is further confirmed using the root-mean-square error index. The prediction results of Thiele’s empirical formula and the modified stress field model under this crack combination are compared. The new model can still maintain good prediction effects even when extrapolating for small cracks using limited test data. Because of its precision and convenience, the proposed model may relatively facilitate the application of single-edge notched or uniaxial central tearing tests.

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

“…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 damage to investigate the damage and failure behaviours…”

Mechanical properties of flexible composites reinforced with high-performance glass fiber multi-axial warp-knitted fabrics

“…The results showed that the puncture resistance of the coated fabric was closely related to the size of the punch. Zhang et al 28 investigated the tearing performance of PVC-coated fabrics and proposed a new model to predict the critical tear strength. The results showed that the strength utilization of warp and weft yarns of different coated fabrics was similar.…”

Tear and Tensile Strength of 100% Cotton Woven Fabrics’ Basic Structures: Regression Modelling

“…Strong dimensional stability and good cover are seen between them by woven fabric. Strength is one of the most significant features of woven fabric [8]. In stretching a test piece to a breaking point, the highest tensile force measured is called tensile strength or breaking strength.…”