Effects of hygrothermal aging and fiber orientations on constant amplitude fatigue properties of CFRP multidirectional composite laminates

•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 reducti...

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Bibliographic Details
Published inInternational journal of fatigue Vol. 136; p. 105590
Main Authors Behera, Alok, Dupare, Prasanna, Thawre, M.M., Ballal, Atul
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 01.07.2020
Elsevier BV
Subjects
Aging
Carbon fiber reinforced plastics
CFRP
Constant amplitude fatigue
Delamination
Diffusivity
Fatigue life
Fatigue strength
FESEM
Fiber composites
Fiber orientation
Fiber reinforced polymers
Glass transition temperature
Heat treating
Hygrothermal aging
Laminates
Materials fatigue
Moisture
Multidirectional
Orientation effects
Properties (attributes)
Multidirectional
Hygrothermal aging
Constant amplitude fatigue
CFRP
FESEM
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Summary:•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. 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.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2020.105590