Influencing factors and evaluation methods of tearing resistance of coated fabric membranes

In this study, various tests are conducted to reveal the factors influencing the tearing resistance of coated fabrics. Firstly, a uniaxial shear test is designed to study the effect of the stress level on the shear modulus of P-type and G-type coated fabric membranes. The effect of crack length on trapezoidal test results is investigated and the influence of elongation at break on single-edge notched tearing strength and trapezoidal tearing strength is studied by conducting uniaxial cyclic tension. Then a statistical method is included to study the correlation between the single-edge notched tearing strength, trapezoidal tearing strength, tensile strength of single yarn, elongation at break, and shear modulus of four types of P-type and four types of G-type membrane materials. At the same time, the relationship between the single-edge notched tearing strength and crack length is fitted using four tearing theories, and the Thiele formula was proved to be the most recommended theory. Finally, the applicability and limitations of the single-edge notched tearing strength and trapezoidal tearing strength as evaluation indexes of tearing resistance of membrane materials are discussed.