Effects of Stress Frequency and Stress Ratio on the Fatigue of Glass/Epoxy Composite Materials
Composite materials using polymer resins as matrices have viscoelastic behavior. This behavior has effects on the fatigue properties of composite materials. Therefore, one can accelerate the fatigue testing if the loading frequency or temperature is changed. The purpose of this work is to investigate the accelerated fatigue properties of glass/fiber composites. In order to establish the accelerated fatigue properties of glass/epoxy composites, the fatigue testing of unidirectional specimens with different angles is conducted at room temperature under different stresses, stress frequencies, and stress ratios. The results indicate that the fatigue life increases with the increasing of stress frequency or stress ratio for the three types of unidirectional specimens. The reasons for these increasing effects are also discussed.
Soon-Bok Lee and Yun-Jae Kim
S. F. Hwang, Y. D. Su, "Effects of Stress Frequency and Stress Ratio on the Fatigue of Glass/Epoxy Composite Materials", Key Engineering Materials, Vols. 326-328, pp. 1031-1034, 2006