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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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| Cognard, J. Y.; Creac'Hcadec, R.; Da Silva, L. F. M.; Teixeira, F. G.; Davies, Peter; Peleau, Michel. |
| The modelling of the non-linear behaviour of ductile adhesives requires a large experimental database in order to represent accurately the strains which are strongly dependent on the tensile-shear loading combination. Various pressure-dependent constitutive models can be found in the literature, but only a few experimental results are available, for instance, to represent accurately the initial yield surface taking into account the two stress invariants, hydrostatic stress, and von Mises equivalent stress. This paper presents the possibility of combining the use of tests on bulk specimens and tests on bonded assemblies, which strongly limit the influence of the edge effects, with a pressure vessel especially designed to study the influence of hydrostatic... |
| Tipo: Text |
Palavras-chave: Adhesive testing; Finite element analysis; Hydrostatic stress; Modelling; Non-linear behaviour; Yield surface. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00048/15917/13374.pdf |
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| Cognard, J. Y.; Creac'Hcadec, R.; Maurice, J.; Davies, Peter; Peleau, Michel; Da Silva, L. F. M.. |
| Generally, adhesives are viscoelastic-plastic materials, for which the development of viscosity and plasticity varies depending on the type of adhesive and the stress state. Various models exist to represent the yield surface, or the so-called elastic limit, taking into account the two stress invariants, hydrostatic stress and von Mises equivalent stress. Moreover, to develop precise pressure-dependent constitutive models, it is necessary to have a large experimental database in order to accurately represent the adhesive strains which are strongly dependent on the tensile-shear loading combination. Under quasi-static loadings, for a given strain rate range viscous effects can be neglected, but only a few experimental results are available to model the... |
| Tipo: Text |
Palavras-chave: Adhesive testing; Non-linear behaviour; Modelling; Hydrostatic stress; Finite element analysis. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00018/12903/10396.pdf |
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