Damage characterization and fatigue modeling of CFRP subjected to cyclic loading. (15th October 2018)

• Record Type: Journal Article
• Authors: Venkatachalam, S.; Murthy, H.
• Is Part Of: Composite structures. Volume 202(2018)
• Page Start: 1069
• Page End: 1077
• Publication Date: 2018-10-15
• Subjects: Carbon fiber reinforced plastic -- Damage characterization -- Fatigue modeling -- Local transverse strain; Composite construction -- Periodicals; Composites -- Périodiques; 624.18
• DOI: 10.1016/j.compstruct.2018.05.030
• Languages: English
• ISSNs: 0263-8223

Abstract

Abstract: Fatigue damage evolution in CFRP is characterized by variation of local transverse strain from digital image correlation (un-notched) and temperature variation from infrared thermography (notched). The damage evolves over 2–3 stages. Matrix cracks and fiber matrix debonding are observed in ±45°, 90° and 0° plies in stage I. Fiber fracture is observed in 0° plies only in stage II of the un-notched specimen. It is present even in stage I for notched specimens. In notched specimens, extensive fiber fracture is observed in −45°, 90° and 0° plies in stage II due to higher local stresses. Fiber fracture causes a larger rate of increase in local temperature. A three parameter cumulative damage model is used for predicting the damage evolution and fatigue life. Predictions were good for tension–compression tests in unnotched specimens, but inadequate for compression-compression tests. While using temperature for damage characterization in notched specimens, additional parametrization is required.