Adhesive connections in glass structures—part I: experiments and analytics on thin structural silicone

Drass, Michael; Schwind, Gregor; Schneider, Jens; Kolling, Stefan

doi:10.1007/s40940-017-0046-5

Cited by 30 publications

(16 citation statements)

References 38 publications

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“…Among others, the data sets comprise uniaxial tension tests, bulge tests of different biaxiality ratios and planar tension tests. The studies examined unfilled natural rubber (NR) and styrene-butadiene rubber (SBR) [30], carbon black filled NR and SBR [31,32] as well as the silicones Dow Corning  993 [33] and Dow Corning  TSSA [34].…”

Section: Distortional Failurementioning

confidence: 99%

Crack nucleation in hyperelastic adhesive bonds

et al. 2018

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Adhesively bonded glass‐to‐metal connections using structural silicone sealants are investigated in the present study of structural failure. Different failure modes are shown to be relevant depending on the geometry of the adhesive. Dilatational failure corresponding to abrupt growth of cavities in the bulk material may occur in heavily constraint applications where triaxial stress states are present. Distortional failure, i.e. failure owing to change in shape, can be observed when the adhesive can deform comparatively unconstrained. It typically originates from notches such as bi‐material points between adherend and adhesive. This work presents (i) a criterion for cavitation failure surfaces of materials with finite porosity such as Dow Corning® TSSA and (ii) an equivalent stretch concept capable of describing distortional bulk material failure surfaces of various rubber‐like materials. It is further shown that (iii) for notch‐induced crack nucleation a coupled stretch and energy criterion must be fulfilled simultaneously. The coupled criterion is capable of predicting size effects observed in tests of ETAG 002 shear specimen bonded using Dow Corning® 993.

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Section: Distortional Failurementioning

confidence: 99%

Crack nucleation in hyperelastic adhesive bonds

et al. 2018

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“…4 discusses three experiments from literature that are simulated with the novel constitutive model. Here, three-dimensional finite element calculations are performed simulating a simple uniaxial tension test (Santarsiero et al 2016), a biaxial tension test in terms of a bulge test (Drass et al 2018c), and a nearly triaxial tension test (which can be accomplished by testing the so-called pancake test) (Hagl et al 2012a, b). In addition, pancake tests with two different diameters are simulated to prove the accuracy of the model.…”

Section: Scope and Outlinementioning

confidence: 99%

“…To proof that the pseudoelastic cavitation model of Sect. 3 is able to approximate this behavior correctly-not leading into a nonphysical behavior due to disproportional void growth-a full-scale simulation of the dumbbell-shaped tests presented by Drass et al (2018c) is performed.…”

Section: Simulation Of Dumbbell-shaped Tensile Testmentioning

confidence: 99%

“…Since the present constitutive model only considers isothermal processes at a constant strain rate of , this study investigates the stress-strain behavior under a constant temperature of T = 23 • C and a quasistatic displacement rate v UT = 5 mm/s. Based on the results of Drass et al (2018c), TSSA exhibits a nonlinear elastic behavior until fracture occurs-a characteristic property for rubber-like materials-however, TSSA does not exhibit strain stiffening due to locking stretches of the macro-molecules in the polymer matrix. Consequently, when considering isochoric deformations, simple isochoric constitutive models, like the Neo-Hookean model, can be used for TSSA (Drass et al 2018d).…”

Section: Simulation Of Dumbbell-shaped Tensile Testmentioning

confidence: 99%

“…3, is able to validate a simple tensile test without leading to nonphysical results. Drass et al (2018c), where the foil-like TSSA was inflated in a balloon shape using a special test device. In order to measure local strains, a stochastic speckle pattern was applied to the material to be tested.…”

Section: Simulation Of Dumbbell-shaped Tensile Testmentioning

confidence: 99%

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Pseudo-elastic cavitation model: part I—finite element analyses on thin silicone adhesives in façades

Drass

Bois²,

Schneider

et al. 2020

Glass Struct Eng

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This study investigates the structural behavior of adhesive bonds of glass and metal using thin, structural silicones in heavily constrained applications. This special type of connection may lead to triaxial stress conditions under axial loading, which can lead to dilatation failure due to the abrupt growth of cavities (cavitation effect). Cavitation failure leads to significant stress softening and loss of stiffness; however, it increases connection's ductility. These material deformations should be considered when designing glass-metal connections. Therefore, a constitutive model is developed to account for cavitation in hyperelastic materials. The volumetric component of the model is equipped with a non-linear Helmholtz free energy function that accounts for isotropic void growth under hydrostatic loading. An energy coupling term is then added that numerically explicates strain energy under isochoric deformation, while also guaranteeing physical material behavior. The energy

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Vereinfachte rechnerische Last‐Verformungsvorhersage von Klebfugen mit hyperelastischem Verhalten im Konstruktiven Glasbau

et al. 2021

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Geklebte Verbindungen haben im Konstruktiven Glasbau ein großes Anwendungspotential. Allerdings sind die Vorbehalte gegenüber einem tragenden Einsatz aufgrund der fehlenden Kenntnis des Tragverhaltens noch groß. Zwar ist die Abhängigkeit des Materialverhaltens vom vorherrschenden Spannungszustand neben den Einflüssen aus Temperatur, Belastungsgeschwindigkeit und Belastungsgeschichte prinzipiell geklärt, bisher aber nur schwer quantifizierbar. In diesem Beitrag sollen unter klarer Definition der Randbedingungen die Möglichkeiten einer rechnerischen Prognose vorgestellt werden. Über FEM‐Einheitszellenberechnungen mit dem Ogden‐Modell werden über die Spannungsmehrachsigkeit klebstoffspezifische Steifigkeitsortskurven abgeleitet. Der Vergleich der Ergebnisse mit Versuchen ergibt überaus zufriedenstellende Übereinstimmungen. Simplified calculated load‐deformation prediction of adhesive joints with hyperelastic behaviour in glass construction. Bonded joints have great application potential in structural glass construction. However, there are still major reservations against a load‐bearing application due to the lack of knowledge of the load‐bearing behaviour. Although the dependence of the material behaviour on the prevailing stress state in addition to the influences of temperature, load speed and load history has been clarified in principle, it has been difficult to quantify it to date. In this paper the possibilities of a computational prognosis shall be presented under clear definition of the boundary conditions. Using FEM unit cell calculations with the Ogden model, adhesive‐specific stiffness location curves are derived via the stress multiaxiality. The comparison of the results with tests results in very satisfactory similarities.

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Adhesive connections in glass structures—part I: experiments and analytics on thin structural silicone

Cited by 30 publications

References 38 publications

Crack nucleation in hyperelastic adhesive bonds

Crack nucleation in hyperelastic adhesive bonds

Pseudo-elastic cavitation model: part I—finite element analyses on thin silicone adhesives in façades

Vereinfachte rechnerische Last‐Verformungsvorhersage von Klebfugen mit hyperelastischem Verhalten im Konstruktiven Glasbau

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