The Relationship Between Stress and Temperature Distribution During Tension Test of Glass Fiber-Reinforced Plastic by Fiber Orientation Variation.

In this study, effects of variations in the fiber orientation for GFRP tension test on strength and temperature distributions were experimentally investigated. The temperature measurement method for test specimen was proposed in an IR thermography. Lock-in method, which is one of technique in IR thermography to measure the temperature of specimen as a function of time, was utilized to monitor changes in the temperature distribution during crack propagation process. At the maximum stress point, the temperature was significantly increased. A specimen with shorter fracture time showed an abrupt increment of temperature at the maximum stress point. Specimen with longer fracture time displayed increment of temperature after the maximum stress point. Tension strength of 0° direction of GFRP increased being proportional the fiber content and fiber orientation function as a change from isotropy to anisotropy. But, the tension strength of 90° direction by separation of fiber filament decreased when a tension load is imposed for width direction of reinforcement fiber length direction.