Effects of temperature and moisture on the fracture behaviour of composite adhesive joints

Autor(es)

Brito, C. B. G. ^{[1, 2]} ; Sales, R. C. M. ^{[1, 3]} ; Donadon, V, M.

Afiliação do(s) autor(es)

^[1] V, Inst Tecnol Aeronaut, Div Engn Aeronaut, Praca Marechal Eduardo Gomes 50, Sao Jose Dos Campos 12228900, SP - Brazil

^[2] Delft Univ Technol TU Delft, Kluyverweg 1, Delft 2629 HS - Netherlands

^[3] Fac Tecnol Sao Jose Dos Campos Prof Jessen Vidal, Av Cesare Mansueto Giulio Lattes 1350, Sao Jose Dos Campos 12247014, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES; v. 100, JUL 2020.
• Citações Web of Science: 0

Resumo

Mode I interlaminar fracture toughness of CFRP joints co-cured and co-bonded was experimentally characterised under several environmental conditions. Two test campaigns were carried out: one with as-received specimens tested at -54 degrees C and 25 degrees C, and another with hygrothermally aged samples tested at 25 degrees C and 80 degrees C. Dynamic mechanical analysis and scanning electron microscopy were used to explain distinct results. For co-cure, the propagation onset for as-received samples started at the interlayer region between the two adherends before migrating deeper into the adherend, while for as-received co-bonded samples, propagation onset was mainly cohesive. After aging, both bonding techniques failed directly in the adherend, in a fibre-tear fashion. Thus, the aging process presented a higher influence on failure mechanisms than the testing temperature. Regarding performance, mode I fracture toughness did not present a great variation for co-cured samples, since failure locus was always in the adherend. However, the initiation mode I fracture toughness of co-bonding decreased between as-received and aged samples. This difference is attributed to the presence of the adhesive in co-bonded systems, which showed to be more affected by environmental conditions than systems formed by fibre and matrix only, such as co-cured ones. (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