Mode I Interlaminar Fracture Toughness Analysis of Co-Bonded and Secondary Bonded Carbon Fiber Reinforced Composites Joints

Autor(es)

Brito, Camila Belo Gomes ^[1] ; Sales Contini, Rita de Cassia Mendonca ^{[2, 1]} ; Gouvea, Ricardo Francisco ^[1] ; de Oliveira, Arthur Scaglioni ^[2] ; Arbelo, Mariano Andres ^[1] ; Donadon, Mauricio Vicente ^[1]

Afiliação do(s) autor(es)

^[1] ITA, Dept Estruturas Aeroespaciais, Pca Marechal Eduardo Gomes 50, BR-12228900 Sao Jose Dos Campos, SP - Brazil

^[2] Fac Tecnol Sao Jose dos Campos FATEC SJC, Lab Estruturas Leves, Ave Cesare Mansueto Giulio Lattes S-N, BR-12247014 Sao Jose Dos Campos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 20, n. 2, p. 873-882, 2017.
• Citações Web of Science: 3

Resumo

Aiming to reduce aircraft weight, aeronautic industry seeks alternative materials and processes used to join its different structural parts. An option to traditional methods are high performance adhesive joints, which reduce weight, number of parts and component final cost, also resulting in higher strength structures. Although, the lack of experimental data to provide a detailed structural characterization of these joining techniques had limited their commercial application. The proposal of this work is to investigate the Mode I interlaminar fracture toughness under quasi-static loading using DCB specimens of carbon composite joints made by co-bonding and secondary bonding techniques, the latter giving more reliable results. For a better understanding on the failure in the systems, DSC and microscopy techniques were applied, from which three stages of delamination process during testing were observed: 1st Stage) Cohesive failure represented by an unstable crack propagation from a high energy level; 2nd Stage) transition from cohesive to adhesive and final intralaminar failure mode with lower energy levels than Stage 1; and 3rd Stage) completely stable propagation at low energy levels (delamination migrates from intralaminar to interlaminar, entirely in the substrate). (AU)

• Processo FAPESP: 15/16733-2 - Modelagem de Junções Coladas para Aplicações em Estruturas Aeronáuticas de Materiais Compósitos
• Beneficiário: Mariano Andrés Arbelo
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado