Study on Strength and Nonlinear Stress-Strain Response of Plain Woven Glass Fiber Laminates under Biaxial Loading

Abstract

Strength and stress-strain properties are investigated for plain woven glass fiber laminates using thin tubular specimens under biaxial static and cyclic loadings. Some composites show large distortion and fiber reorientation close to failure under biaxial load ing. For such composites the usage of the 2nd Piola-Kirchhoff stress instead of the nominal stress is proposed for strength evaluation. The experimental result reveals that the Tsai-Wu criterion fits the biaxial strength expressed by the 2nd Piola-Kirchhoff stress much better than the strength expressed by the nominal stress. Strong interaction between axial and shear deformations is found beyond the knee/yield points while, within the elastic range no interaction is found between the axial and shear stiffness. Fiber misalignment with the loading axis affects the observed stress-strain behavior under cyclic loading. More than two S-S curves are distinguishable when the fiber misalignment is higher than 2°. Such stress-strain relations are successfully simulated using an incremental method in conjunc tion with updating fiber orientation. Good agreement between the calculated result and ex perimental one confirms that the proposed model which considers fiber misalignment can explain the observed stress-strain response under biaxial fatigue loading.

Fatigue models for woven textile composite laminates

“…In this context, the older work of Fujii and coworkers (Amijima & Fujii, 1987;Lin et al, 1991;Fujii, Amijima, Lin, & Sagami, 1992;Fujii & Lin, 1995;Inoue, Fujii, & Kawakami, 2000) on biaxial tensionetorsion loading of plain weave glass fabric tubular specimens is still relevant, but no attempts were made to effectively model the observed stiffness degradation.…”

Static strength and failure mechanism of CFRP under biaxial loadings

“…Earlier studies [5,9] on determining a suitable failure criterion for advanced continuous fiber composites often employed the Tsai--Wu tensor-polynomial, given in its quadratic form for the plane stress by Flo, + F2a2 + Fe% + Fnc; 2 + F22(;: + 2Fi~zo 2 + F~os 2 = 1, (14) where the parameters F~ and Fi/(i, j = 1, 2, and 6) are related to the uniaxial and biaxial strengths. The third term in Eq.…”

“…Fujii et ai. [4,5] investigated the strength and nonlinear stress/strain response of wet wound woven glass fiber laminates, and estimated the strength using the Tsai--Wu and Tsai--Hill criterion and the second Piola--Kirchhoff stress. These studies focused on the characterization of the biaxial strength.…”

Experimental Analysis of the Tensile Properties of Painting Canvas

“…In terms of the structural characteristics, fabrics are described as elastic orthotropic materials at very small deformation which are defined as orthotropic plates with two mutually perpendicular planes of elastic symmetry [16,7]. These planes of elastic symmetry are planes of orthotropy.…”