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| Ilioni, Alin; Badulescu, C.; Carrere, N.; Davies, Peter; Thevenet, D.. |
| Most of the adhesives used in the marine industry are polymers with a mechanical behaviour which is strongly influenced by the strain rate. Therefore, it is important to predict with accuracy their viscous behaviour. To describe their mechanical behaviour in a bonded joint, a viscoelastic-viscoplastic constitutive law is proposed here. The viscous effects on the elastic behaviour is described using a spectral distribution, which divides the viscous strain as the sum of the strains of several viscous mechanisms, each of them with a different characteristic time and weight. The viscoplastic component of the model permits a better description of the strong non-linear behaviour of the adhesives. The parameters of the constitutive law are obtained using an... |
| Tipo: Text |
Palavras-chave: Epoxides; Mechanical properties of adhesives; Creep / mechanical relaxation. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00415/52651/53507.pdf |
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| Cognard, J; Creac' Hcadec, R; Sohier, L; Davies, Peter. |
| This paper describes a study in which the shear behavior of a structural epoxy adhesive has been measured using the standard thick adherend shear test (TAST) specimen and a modified Arcan test A. numerical study of the TAST test taking into account the nonlinear behavior of the adhesive and the finite deformations of the adhesive joint, shows that there is a localization of plastic zones close to the adhesive-substrate interface near the free edge of the adhesive. Experimental tests carried out with steel and aluminum substrates and with various adhesives also show that failure initiates in this region. These edge effects in the TAST fixture can lead to an incorrect analysis of the behavior of the adhesive (for instance, underestimation of the shear stress... |
| Tipo: Text |
Palavras-chave: Adhesive testing; Mechanical properties of adhesives; Stress distribution; Epoxy/epoxides. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4646.pdf |
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| Ilioni, Alin; Le Gac, Pierre-yves; Badulescu, Claudiu; Thévenet, David; Davies, Peter. |
| This article describes an approach to predict the behaviour of an epoxy adhesive in bulk form in a marine environment. First, the material, the experimental conditions and the predictive framework are described. Then the experimental results are presented, which indicate that the effects on yield stress of either a uniform water profile or elevated testing temperature can be shown to be equivalent when plotted versus T-Tg. Moreover, a discussion of these results shows how they can be used to predict changes in the mechanical properties of the adhesive. Prediction results for yield stress are in good agreement when they are compared with experimental results for the case of a water profile gradient, in order to evaluate the relevance and limitations of the... |
| Tipo: Text |
Palavras-chave: Epoxide; Water ageing; Glass transition temperature; Mechanical properties of adhesives; Plasticisation. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00419/53052/54052.pdf |
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| Maurice, Julien; Creac'Hcadec, Romain; Cognard, Jean-yves; Davies, Peter; Meirinhos, Georges; Mahdi, Stephane. |
| Adhesive bonding is an interesting structural assembling technique for weight saving in modern commercial aircraft, in which the use of composites materials is increasing. In order to meet both optimization and respect of safety conception constraints, the development of accurate numerical strategies is required. Thus, improvement in the experimental characterization and in the design of reliable numerical tools for bonded assemblies is necessary. This paper presents the characterization of the elastic-plastic behaviour of four aeronautical adhesive films, consisting of two epoxy-based resins supported by two types of carrier. The characterization over a wide range of monotonic proportional tensile-shear loads is performed using a modified Arcan test... |
| Tipo: Text |
Palavras-chave: Aeronautical; Mechanical properties of adhesives; Numerical modeling. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00142/25317/26067.pdf |
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