Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 07, 2017 - October 09, 2017
The study is to investigate the mechanical properties, cracks behaviors and the effect of matrix cracking on the mechanical properties of angle-ply FRP laminates. Three types of materials were tested for this purpose: 1. CFRP (T700SC/2592, Torayca), 2. CFRP (T700SC/2500, Torayca), 3. GFRP (GE352G135SB). FRP laminates with laminated structures of [θm(2)/ θn(1)]s are monotonically loaded to obtain its mechanical properties. In order to obtain more cracks on specimen, notches were made at the edges of some specimens to create artificial cracks before tested by tensile test machine. Cyclic loading tensile test were also done at certain stress points after inlinearity started to form. As the laminates are loaded and unloaded back to 0 MPa, strain became non-zero due to the existence of residual strain, where laminates are plastically deformed. Cracks observation for CFRP laminates was done by using X-ray machine while for GFRP laminates, due to its semi-transparent properties, cracks formation can be viewed in real time by using DSLR camera. The experimental results of stiffness reduction and crack density relationship agreed well to analytical results. Understanding the damage behavior in cross-ply and angle-ply laminates is important so that damage behavior and its effects in laminates with more complex configuration such as quasi-isotropic laminates can be predicted.
