Effects of hygrothermal aging and fiber orientations on constant amplitude fatigue properties of CFRP multidirectional composite laminates. (July 2020)

• Record Type: Journal Article
• Authors: Behera, Alok; Dupare, Prasanna; Thawre, M.M.; Ballal, Atul
• Is Part Of: International journal of fatigue. Volume 136(2020)
• Publication Date: 2020-07
• Subjects: CFRP -- Multidirectional -- Hygrothermal aging -- Constant amplitude fatigue -- FESEM; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2020.105590
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: CFRP [±454 ] S and [+45, −45, 0, 90]2S laminates were hygrothermal aged up to saturation. Variation in 3-dimensional moisture diffusivity due to fiber orientation was analyzed. Both static and fatigue strength decreased owing to matrix degradation and fiber-matrix debonding. The fatigue life reduction was higher in T-C loading as compared to T-T loading. Fiber-matrix interfacial bonding was poor after aging regardless of fiber orientation. Abstract: Carbon fiber reinforced polymer (CFRP) multidirectional composite laminates are vital for moisture-prone structures where directional fatigue properties can be optimized. In this work, the tension-tension(T-T) and tension-compression(T-C) fatigue properties of hygrothermal aged [±454 ]S and [+45, −45, 0, 90]2S laminates were compared with virgin properties. The effect of fiber orientation and hygrothermal aging on moisture diffusivity, FTIR spectra, glass transition temperature, and static strength was also investigated. The fiber orientation had a minor impact on moisture diffusivity, static strength, and fatigue strength. Aging caused degradation in T-C fatigue life was higher as compared to T-T loading due to fiber-matrix debonding and matrix properties deterioration.