Abstract
In order to obtain the in-plane shear stress-strain relations of Glass Fabric Reinforced Plastic Laminates (GFRP laminates) the following three experimental methods are considered : 1) Uniaxial tensile test at the angle of 45° to the warps of a fabric. (Petit and Rosen's method.) 2) Pure shearing test with the combined biaxial tension-compression testing machine designed by the author. 3) Torsion test with a tubular specimen. The experimental results show that the 45°tensile test is effective to obtain easily the in-plane shear stress-strain relations of a GFRP laminate. Non-linear tensile stress-strain relationships are derived by using these inplane shear stress-strain relations and the stress-dependent elastic moduli reported in the previous paper. Uniaxial and biaxial tensile tests are carried out under constant stress ratios in the 15, 30 and 45° directions to the warps of the fabrics. The calculated values agree fairly well with the experimental results.
