Crack nucleation in hyperelastic adhesive bonds

Rosendahl, Philipp Laurens; Drass, Michael; Schneider, Jens; Becker, Wilfried

doi:10.1002/cepa.941

Cited by 9 publications

(7 citation statements)

References 38 publications

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“…The latter procedure is called the line method Taylor (2008). Due to the good results observed by Rosendahl et al (2018 when applying the line method to silicone adhesives, the current study also follows this approach.…”

Section: Numerical Evaluation Of Finite Fracture Mechanicsmentioning

confidence: 99%

Cavitation and crack nucleation in thin hyperelastic adhesives

Rheinschmidt,

Drass,

Schneider

et al. 2023

Preprint

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The present study investigates in the failure of adhesive bondings with structural silicone sealants. Point connectors of two circular metal adherends bonded with DOWSILTM TSSA are subjected to tensile loading. We formulate and use a constitutive law that captures volumetric softening owing to the formation of cavities. Therein, cavitation is considered a process of elastic instability which is homogenized with a pseudo-elastic approach. Ultimate failure initiating from the free edges is predicted employing the framework of finite fracture mechanics. The concept requires both a strength-of-materials condition and a fracture mechanics condition to be satisfied simultaneously for crack nucleation. For the former, we use a novel multiaxial equivalent strain criterion. For the latter, we employ literature values of the fracture toughness of DOWSILTM TSSA. The predicted onset of cavitation and ultimate failure loads are in good agreement with our experiments. The proposed model provides initial crack lengths that allow for the derivation of simple engineering models for both initial designs and proof of structural integrity while simultaneously extending the range of usability of the structural silicone compared to standardized approaches.

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Section: Numerical Evaluation Of Finite Fracture Mechanicsmentioning

confidence: 99%

Cavitation and crack nucleation in thin hyperelastic adhesives

Rheinschmidt,

Drass,

Schneider

et al. 2023

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…So far there are no simple numerical models to describe the material behavior of thin silicone adhesives in façade applications, so analytical models were developed in order to realistically depict the structural behavior (Descamps et al 2017). Ongoing research in the field of structural silicones and MS polymers lies in creating physically accurate, constitutive models of structural behavior (Dispersyn et al 2017;Drass et al 2018d) and limit state analyses of such connections (Staudt et al 2018;Rosendahl et al 2018;Santarsiero et al 2018).…”

Section: Motivation and Problem Statementmentioning

confidence: 99%

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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“…In the following this criterion is abbreviated as PBP criterion. Using the notation of Rosendahl et al (2018), the distortional failure criterion Φ iso is described in stretch space by Approximating the failure stretches of DOWSIL 993 with the PBP criterion results in the following twodimensional failure surface, which is also shown in the π plane in Fig. 4b.…”

Section: Model Uncertainties For the Stretch-based Limit State Functi...mentioning

confidence: 99%

Dimensioning of silicone adhesive joints: Eurocode-compliant, mesh-independent approach using the FEM

Drass

Kraus

2020

Glass Struct Eng

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This paper deals with the application of the semi-probabilistic design concept (level I, DIN EN 1990) to structural silicone adhesives in order to calibrate partial material safety factors for a stretch-based limit state equation. Based on the current legal situation for the application of structural sealants in façades, a new Eurocode-compliant design concept is introduced and compared to existing design codes (ETAG 002). This is followed by some background information on semi-probabilistic reliability modeling and the general framework of the Eurocode for the derivation of partial material safety factors at Level I. Within this paper, a specific partial material safety factor is derived for DOWSIL 993 silicone on the basis of experimental data. The data were then further evaluated under a stretch-based limit state function to obtain a partial material safety factor for that specific limit state function. This safety factor is then extended to the application in finite element calculation programs in such a way that it is possible for the first time to perform mesh-independent static calculations of silicone adhesive joints. This procedure thus allows for great optimization of structural sealant design with potentially high economical as well as sustainability benefits. An example for the static verification of a bonded façade construction by means of finite element calculation shows (i) the application of EC 0 to silicone adhesives and (ii) the transfer of the EC 0 method to the finite element method with the result that mesh-independent ultimate loads can be determined.

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Crack nucleation in hyperelastic adhesive bonds

Cited by 9 publications

References 38 publications

Cavitation and crack nucleation in thin hyperelastic adhesives

Cavitation and crack nucleation in thin hyperelastic adhesives

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

Dimensioning of silicone adhesive joints: Eurocode-compliant, mesh-independent approach using the FEM

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