Interlaminar crack onset in co-cured and co-bonded composite joints under mode I cyclic loading

Author(s)

Shiino, Marcos Yutaka ^[1] ; Gonzalez Ramirez, Francis Mariana ^[2] ; Garpelli, Felipe Parise ^[2] ; Alves da Silveira, Nubia Nale ^[2] ; Mendonca Sales, Rita de Cassia ^{[2, 3]} ; Donadon, Mauricio Vicente ^[2]

Affiliation

^[1] Univ Estadual Paulista Unesp, Dept Engn Ambiental, Inst Ciencia & Tecnol, BR-12247004 Sao Jose Dos Campos - Brazil

^[2] Inst Tecnol Aeronaut ITA, Div Engn Aeronaut, Praca Marechal do Ar Eduardo Gomes, BR-12228900 Sao Jose Dos Campos, SP - Brazil

^[3] Fac Tecnol Sao Jose dos Campos Prof Jessen Vidal, Sao Jose Dos Campos, SP - Brazil

• Document type: Journal article
• Source: FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES; v. 42, n. 3, p. 752-763, MAR 2019.
• Web of Science Citations: 0

Abstract

Composite joints exhibit different behavior in regard to delamination resistance when dealing with fatigue phenomenon. This research work focuses on an investigation to understand the failure mechanisms on the interfacial strength domain for delamination onset in cocured and cobonded joints. The analysis was based on strain energy release rate versus number of cycles plots that were obtained from fatigue tests in mode I with a stress ratio R = 0.1. The analysis encompassed from the microscopic to mesoscopic level obtained from scanning electron microscopic, and the images processed to extract the most relevant fracture patterns. The main difference between the two technologies was the stress concentration at the crack tip in which the cobonded joint presents a fabric carrier that blunts the adhesive layer, then delaying the delamination. This paper provides important information and guidelines to aid designers in the selection of the best composite joint for high-performance structural applications. (AU)

• FAPESP's process: 11/01937-0 - Crack growth rate in 5HS carbon/epoxy composites manufactured by RTM: Relationship between axial loadings with pure modes of delamination I and II
• Grantee: Marcos Yutaka Shiino
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 12/07646-0 - Evaluation of pressure gradient effect of RTM process on 5HS laminate by conducting DCB fatigue test
• Grantee: Marcos Yutaka Shiino
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 15/16733-2 - Modelling of bonded joints in composite material structures for aeronautic applications
• Grantee: Mariano Andrés Arbelo
• Support Opportunities: Scholarships in Brazil - Post-Doctoral