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See detailMeasuring mode I fracture properties of thick-layered structural silicone sealants
Rosendahl, P. L.; Staudt, Y.; Odenbreit, Christoph UL et al

in International Journal of Adhesion and Adhesives (2019), 91

The failure hyperelastic structural sealant joints is a fracture mechanics problem. Its modeling requires knowledge of the material property fracture toughness. The present work describes a methodology ... [more ▼]

The failure hyperelastic structural sealant joints is a fracture mechanics problem. Its modeling requires knowledge of the material property fracture toughness. The present work describes a methodology for determining the mode I bulk material fracture toughness of structural silicone sealants. The concept is demonstrated using DOWSIL™ 993 as an example. In total we manufactured, tested and evaluated 13 DCB specimens of 6mm and 12mm adhesive thickness. The fracture toughness is identified from J-integral measurements. The theory for determining the J-integral at finite deformations is laid out and an automated data analysis procedure is suggested. The presented approach further allows... [less ▲]

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See detailFailure behaviour of silicone adhesive in bonded connections with simple geometry
Staudt, Yves UL; Odenbreit, Christoph UL; Schneider, Jens

in International Journal of Adhesion and Adhesives (2018), 82

In façade structures, adhesively bonded connections between glass panels and metallic substructures represent an attractive alternative to mechanical fixation devices. Apart from positive aspects ... [more ▼]

In façade structures, adhesively bonded connections between glass panels and metallic substructures represent an attractive alternative to mechanical fixation devices. Apart from positive aspects regarding the construction's energy efficiency and aesthetics, the uniform load transfer reduces stress concentrations in the adherends, which is beneficial especially regarding brittle materials like glass. Structural silicone sealants are generally used for these kind of applications due to their excellent adhesion on glass and their exceptional resistance against environmental influences and ageing. For the verification of the bonded connection, non-linear numerical simulations, such as the Finite Element Method, are increasingly used. The resulting three-dimensional stress states need to be assessed with the help of an appropriate failure criterion. In this paper, an overview is given on available failure criteria for rubber-like materials. The applicability of these criteria on the silicone sealant is verified regarding three characteristic stress states: uniaxial tension, shear and compression. The proposed engineering failure criterion is the true strain magnitude, which is valid for bonded connections in form of linear beads for cohesive failure of the adhesive. For Dow Corning® 993 structural silicone sealant, the strain magnitude, evaluated using true strains, at failure could be determined as 1.6. [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 and 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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