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

Brito, Camila Belo Gomes; Sales, Rita de Cássia Mendonça; Donadon, Maurício Vicente

doi:10.1016/j.ijadhadh.2020.102607

Cited by 24 publications

(7 citation statements)

References 12 publications

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“…Subsequently, the specimens were mechanically dried using free-lint tissue before the final weight is recorded. Water uptake and normalized water absorption rate of the nanocomposite adhesives were determined by the following expressions, respectively [ 24 ].

where M t is the water absorbed at time at specific immersion period, W f and W i are sample final weight after respective immersion period and sample initial weight, respectively.…”

Section: Methodsmentioning

confidence: 99%

Moisture Absorption Behavior and Adhesion Properties of GNP/Epoxy Nanocomposite Adhesives

2021

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In the current work, an attempt has been made to investigate the effect of Graphene Nanoplatelets (GNP) reinforcement to water absorption behavior and mechanical properties of adhesive bonding with epoxy. Epoxy adhesive with various GNP content (i.e., 0.0~2.0 wt%) was utilized to joint aluminum adherend subjected to various immersion periods (i.e., 0~60 days). Subsequently, the effect of GNP reinforcement on water uptake, water absorption rate and tensile shear strength was investigated. Depending on GNP content, two distinct behaviors in water uptake and moisture absorption rate have been observed; specimens with lower GNP content (0.5~1.0 wt%) have demonstrated increased/retention of water uptake and water absorption rate regardless of immersion period. Meanwhile, at higher GNP content (1.5~2.0 wt%), decreased water uptake and water absorption rate are generally observed. At similar GNP content, regardless of immersion periods, water immersed specimens generally demonstrate higher or retention of shear strength when compared to specimens at 0-day immersion period. These observations suggest that the relation between moisture absorption behavior and mechanical properties of GNP-reinforced adhesive with GNP content are rather complex which might be attributed to the interplay of several possible mechanisms.

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where M t is the water absorbed at time at specific immersion period, W f and W i are sample final weight after respective immersion period and sample initial weight, respectively.…”

Section: Methodsmentioning

confidence: 99%

Moisture Absorption Behavior and Adhesion Properties of GNP/Epoxy Nanocomposite Adhesives

2021

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“…Strength of joints was reduced both by moisture absorption and by temperature change. After prolonged exposure to hygrothermal environment, bond strength degradation was observed for CFRP/CFRP, 27 CFRP/Al, 28 and CFRP/Steel 29,30 bonded joints without external force. For dry specimens at room temperature, the main failure modes were the cracking of adhesive layer.…”

Section: Introductionmentioning

confidence: 99%

Strength loss and aging life of single-lap CFRP bonded joints under hygrothermal environment

Zhang

Xing

2023

Journal of Reinforced Plastics and Composites

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Strength evolution of CFRP laminates and bonded joints because of moisture absorption was investigated experimentally. Experiments of accelerated moisture absorption under different temperatures, quasi-static tension, and fracture surfaces morphology observations were conducted. Strength loss and failure modes change due to moisture absorption were discussed in detail. An empirical model of predicting strength loss of the CFRP bonded joints due to moisture absorption was presented using a direct and an indirect method. Based on the time-temperature equivalent principle, a new approach of predicting the aging life of the CFRP bonded joints using the laboratory experimental data was proposed. Experimental data from references were extracted to check the strength loss model. The results demonstrated that the strength loss ratio of CFRP bonded joints soaked in 50°C water for 39 days exceeds 27.4%. The large degradation can attribute to the failure modes change from the interfacial failure to the cohesive failure and then return to the interfacial failure. The ratio of strength loss can be predicted by a first order decay exponential equation.

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“…Características como área de colagem, espessura do adesivo, rugosidade e tratamento superficial dos elementos, propriedades químicas do elemento e adesivo, tempo de cura e condições ambientais são as mais influentes na eficiência da ligação [5], [6], [12]- [14]. Neste grupo, apenas as condições ambiente vão variar durante a vida útil da estrutura [13].…”

Section: Introductionunclassified

Durabilidade de Estruturas Mistas em Aço-Betão Coladas

Rocha,

Aguiar,

Valente

2023

ECUM

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A utilização mista de materiais baseia-se no aproveitamento do comportamento mecânico específico de cada material. A utilização de estruturas mistas em aço e betão tem vindo a crescer e mostra-se eficiente tanto na construção de novas edificações quanto na reabilitação. A procura pelo desenvolvimento sustentável na construção civil está diretamente relacionada com a racionalização da utilização de recursos minerais em conjunto com a redução do desperdício e o aproveitamento otimizado das estruturas. Com este intuito, procura-se desenvolver soluções construtivas que facilitem a reabilitação de construções existentes e sistemas construtivos com alto desempenho em termos de vida útil. Este estudo está voltado para o tema da sustentabilidade na medida em que se pretende uma melhor compreensão dos fenómenos associados à durabilidade dos materiais e componentes do sistema construtivo misto em aço e betão e se procura por soluções mais duradouras e otimizadas. Neste trabalho, pretende-se aprofundar o conhecimento de sistemas mistos de aço e betão, onde são utilizados perfis metálicos enformados a frio e galvanizados, em combinação com diferentes composições de betão, utilizando adesivos estruturais na ligação entre estes componentes. Neste contexto, pretende-se realçar os processos de degradação e a sua influência no comportamento global dos elementos mistos analisados. Foram realizados ensaios em elementos estruturais em aço enformado a frio colados a elementos em betão, com a finalidade de avaliar a durabilidade dessas estruturas quando expostas a condições ambientais desfavoráveis. Os resultados obtidos mostram que, embora em alguns casos a degradação afete parcialmente a capacidade resistente dos elementos, em outros casos, este tipo de sistema construtivo pode ser utilizado mantendo a capacidade resistente esperada dos elementos constituintes.

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

Cited by 24 publications

References 12 publications

Moisture Absorption Behavior and Adhesion Properties of GNP/Epoxy Nanocomposite Adhesives

Moisture Absorption Behavior and Adhesion Properties of GNP/Epoxy Nanocomposite Adhesives

Strength loss and aging life of single-lap CFRP bonded joints under hygrothermal environment

Durabilidade de Estruturas Mistas em Aço-Betão Coladas

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