References of "Dias, Vincent 40020953"
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See detailInvestigation of hybrid steel-glass beams with adhesive silicone shear connection
Odenbreit, Christoph UL; Dias, Vincent UL

in Steel Construction (2016), 9(3), 207-221

Glass is used in current construction applications mostly as a façade element, its structural role being only rarely exploited, despite its significant resistance to in-plane compression. A steel-glass ... [more ▼]

Glass is used in current construction applications mostly as a façade element, its structural role being only rarely exploited, despite its significant resistance to in-plane compression. A steel-glass composite beam was built to investigate a hybrid steel-glass assembly and its loadbearing behaviour. To fulfil this objective, the existing types of steel-glass connection were evaluated, which allowed the possibilities offered by adhesive jointing to be highlighted. The selection of the adhesive, detailed in the present article, constituted a crucial aspect. An excessively soft connection does not transfer the shear loads between the glass and steel adherends, whereas an excessively stiff connection leads to failure of the glass. A two-component structural silicone was chosen and its properties were assessed with the help of an intensive test programme. As a result of this programme, a new quasi-incompressible hyperelastic material law was developed in order to represent the silicone elastomer behaviour. Numerical simulations were conducted in parallel to large-scale four-point bending tests on the adhesively bonded steel-glass composite beams. The aims were, on the one hand, to assess the bending stiffness of the steel-glass composite beam and, on the other, to validate the numerical simulations to conduct parametric studies. [less ▲]

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See detailDevelopment of a constitutive hyperelastic material law for numerical simulations of adhesive steel–glass connections using structural silicone
Dias, Vincent UL; Odenbreit, Christoph UL; Scholzen, Frank UL et al

in International Journal of Adhesion & Adhesives (2014), 48

Silicone elastomers are amongst others employed in glass façades as structural connection materials. They are known to be durable adhesives, able to transfer forces under variable loading and atmospheric ... [more ▼]

Silicone elastomers are amongst others employed in glass façades as structural connection materials. They are known to be durable adhesives, able to transfer forces under variable loading and atmospheric conditions during their design life. For the dimensioning of adhesive joints, numerical simulations are often used, especially for joints which exhibit large deformations and/or for complex geometries. However, silicones have strong non-linear material behaviour already at small strain deformations, are slightly compressible and show a time-depending behaviour. The current existing material laws do not allow for considering these effects properly in simulation, particularly for combined loading. Therefore a hyperelastic material law for silicones has been developed and validated, based on a strain energy function. For this purpose, test series have been carried out to determine all relevant material parameters needed to describe the strain energy potential, namely tension, compression, shear and multi-axial oedometric test series on non-aged and artificially aged specimens. Furthermore, the softening due to low cyclic loading (Mullins’ effect) has been considered and quantified by comparison to quasi-static loading for all test series. The developed hyperelastic model has been implemented into the finite element software Abaqus® for validation and the results of numerical simulations have been compared to experimental results and existing laws. The comparison showed that the proposed model better matched the real behaviour of silicone elastomers and led to an increase in exactness of the numerical simulations of adhesive joints. [less ▲]

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See detailDevelopment of adhesives constitutive material laws for the assessment of bonded steel to glass partial composite beams
Dias, Vincent UL

Doctoral thesis (2013)

Glass products are widely employed in transparent facade and roof structures as tertiary non-structural elements despite their large in-plane compressive resistances. To structurally implement them in ... [more ▼]

Glass products are widely employed in transparent facade and roof structures as tertiary non-structural elements despite their large in-plane compressive resistances. To structurally implement them in building, tensile stresses must be consequently reduced or avoided. The later requirements would be fulfilled by realizing composite steel to glass connection, whose principal difficulty would arose from the connection mean which should be sufficiently rigid to transfer shear forces and sufficiently soft to not alter the glazing. Two possible jointing methods were envisaged and investigated to accomplish this assembly and overcome this problem, i.e. a linear adhesive bonding of the steel and glass parts and a mixed mechanical-adhesive connection. In consequence, two potential adhesives were selected, a silicone elastomer and a UV-curing acrylic thermoset. A lack of knowledge with regards to their mechanical properties implied the conduction of several series of quasi-static, cyclic and long-term relaxation tests. The possible influence of external parameters, such as temperature, humidity or UV-radiation, on their uniaxial tension/compression and shear behaviours was evaluated with the help of statistical methods applied on the results of Taguchi design of experiments tables. With the invariance of the silicone properties, a new hyperelastic quasi-incompressible constitutive material law accounting for the quasi-static and post Mullins effect behaviour was developed and validated with finite element analyzes of the small-scale experimental tests. The UV-acrylic was however found strongly dependent on the loading rate and one-dimensional models were suggested to describe the quasi-static tension and shear behaviour under specific rates. In reason of the poor long-term properties of the UV-acrylic, only the silicone was regarded for the construction of the two types of composite beams. Pre-evaluations issued from numerical simulations including the developed material law accommodated perfectly with theoretical data and approached the large-scale tests results by considering the manufacturing operations conducted on the steel beam. [less ▲]

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See detailDetermination of the material properties of an epoxy and MS-polymer for adhesive point-fixings
Dispersyn, Jonas; Belis, Jan; Dias, Vincent UL et al

in COST Action TU0905 book (2013, April)

Adhesive point-fixings are being used more frequently because of their numerous advantages compared to traditional bolted connections, such as a better load introduction, the absence of drilling holes in ... [more ▼]

Adhesive point-fixings are being used more frequently because of their numerous advantages compared to traditional bolted connections, such as a better load introduction, the absence of drilling holes in the glass and increased thermal performances. For the analysis of such fixings the use of finite element analyses is necessary. The adhesive properties in these finite element analyses are presented on the basis of stress-strain curves. The determination of the stress-strain curves is done by experimental testing on bulk material of the adhesive. With these tests the displacement rate reliance can also be studied. In this contribution, the fabrication and testing of test samples is described for two selected adhesives. The experimental data show that the selected adhesives behave stiffer under tension as the displacement rate is decreased. [less ▲]

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See detailDevelopment of material law for silicone to simulate structural adhesive connections
Dias, Vincent UL; Odenbreit, Christoph UL; Hechler, Oliver UL et al

in Jens Schneider, Bernhard Weller (Ed.) Engineered Transparency Handbook (2012, October)

Recently developed adhesive materials enable the transfer of high loads between glass and other materials for structural use. However, for a numerical simulation, the description of the non-linear ... [more ▼]

Recently developed adhesive materials enable the transfer of high loads between glass and other materials for structural use. However, for a numerical simulation, the description of the non-linear behaviour of the adhesives must still be improved. Therefore extensive experimental investigations have been carried out on a structural elastomer and a material constitutive model has been derived based on the experimental results. Via numerical studies, the new constitutive model has been validated and assessed by comparison to test data and existing models. [less ▲]

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See detailDesign concept for point fitting of insulation glass units
Hechler, Oliver UL; Tibolt, Mike UL; Odenbreit, Christoph UL et al

in VI International Congress on Architectural Envelopes - Book (2012, June)

The façade significantly influences the energy efficiency of the building. However, in addition to high insulating properties, modern architecture demands a high transparency for natural illumination and ... [more ▼]

The façade significantly influences the energy efficiency of the building. However, in addition to high insulating properties, modern architecture demands a high transparency for natural illumination and the compliance with inner comfort criteria in the building. The increasing use of glass can be seen as the architectural intention to combine those well-being and energetic principles. The highest transparency can be achieved with point-fitted glass units. Though, insufficient knowledge is present to use point fittings for insulation glass units, which are required to comply with the demand for energy-efficiency. Therefore, research has been carried out to investigate in the load bearing mechanism of different point-fitted insulating glass units in order to find an innovative point fitting connection system for insulating glass units to the steel substructures. This paper presents results of this research campaign and provides information on how to design point-fitted insulating glass units. [less ▲]

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See detailDetermination of Adhesives Properties for Non-linear Numerical Simulation of Structural Steel-Glass Connections
Dias, Vincent UL; Odenbreit, Christoph UL; Hechler, Oliver UL

in Bos, Louter, Nijsse, Veer (Ed.) Handbook of the Challenging Glass 3 conference (2012, June)

In the construction of façades, connections between glass and glass as well as other materials with varying properties, e.g. metals, are currently designed with, inter alia, the application of adhesives ... [more ▼]

In the construction of façades, connections between glass and glass as well as other materials with varying properties, e.g. metals, are currently designed with, inter alia, the application of adhesives. The related analytical evaluation of the load bearing characteristics of these kinds of assemblies requires the correct determination of the adhesives’ properties; knowledge in this field is still incomplete. Therefore an extensive test campaign on the load bearing and displacement behaviour of common structural silicone and UV-acrylic was carried out with the aim, to identify appropriate models to describe their properties under quasi-static loading and for their implementation in numerical analyses. The test program, comparisons between the different adhesive materials and a summarised outcome will be presented in this paper. [less ▲]

Detailed reference viewed: 96 (4 UL)