Residual modulus degradation model for woven fabric composite determined by impulse excitation technique

• Autor(a) principal: Maciel, Maísa Milanez Ávila Dias [UNESP]
• Data de Publicação: 2020
• Outros Autores: Shiino, Marcos Yutaka [UNESP], Voorwald, Herman Jacobus Cornelis [UNESP], Cioffi, Maria Odila Hilário [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1016/j.ijfatigue.2019.105456; http://hdl.handle.net/11449/199870
• topic: 5HS woven; Carbon fiber; Crack propagation; Delamination; Epoxy

Structural components in the aircraft industries often require geometries that induce stress concentration effects, intensifying fatigue phenomena. When combined with a lack of structural monitoring it may limit composite applications. This research focuses on stiffness reduction of a notched carbon fiber laminate subjected to tension-tension fatigue load. The stiffness reduction was monitored during the cyclic tests by the use of the impulse excitation technique. Three major degradation stages were observed, the initial stage showed a high degradation rate followed by constant modulus degradation. The last stage was related to the presence of extensive delamination occurring outside of the notch area.