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Nonlinear elastic finite fracture mechanics: Modeling mixed-mode crack nucleation in structural glazing silicone sealants

Rosendahl, Philipp Laurens and Staudt, Yves and Schneider, Alexandra Patrizia and Schneider, Jens and Becker, Wilfried (2019):
Nonlinear elastic finite fracture mechanics: Modeling mixed-mode crack nucleation in structural glazing silicone sealants.
In: Materials & Design, 182Elsevier, p. 108057, ISSN 02641275,
DOI: 10.1016/j.matdes.2019.108057,
[Online-Edition: https://tuprints.ulb.tu-darmstadt.de/9297],
[Article]

Abstract

Requiring both stress and energy conditions to be met simultaneously proved key to modeling brittle crackformation at singular and nonsingular stress concentrations in linear elastic materials. The present workextends this so-called coupled stress and energy criterion to brittle crack nucleation in hyperelastic mediausing the example of silicone adhesives. For this purpose, we provide a comprehensive constitutive as wellas fracture mechanical characterization of the structural silicone adhesive DOWSIL™ 993 using a large setof experiments and propose a mixed-mode failure model for crack initiation in nonlinear elastic materials.Characterized in independent experiments, the model is used to determine critical loads of hyperelasticadhesive bonds in both shear and tension dominated configurations. For any of the examined adhesive jointconfigurations the model predicts and explains size effects and agrees well with experimental findings. Westudy stable and unstable crack propagation observed in video recordings of our experiments. It is shownthat crack initiation, crack growth and crack arrest are caused by nonmonotonic energy release rates andcan be predicted. Effects of excess energy available after crack nucleation and initial unstable crack growthare discussed.

Item Type: Article
Erschienen: 2019
Creators: Rosendahl, Philipp Laurens and Staudt, Yves and Schneider, Alexandra Patrizia and Schneider, Jens and Becker, Wilfried
Title: Nonlinear elastic finite fracture mechanics: Modeling mixed-mode crack nucleation in structural glazing silicone sealants
Language: English
Abstract:

Requiring both stress and energy conditions to be met simultaneously proved key to modeling brittle crackformation at singular and nonsingular stress concentrations in linear elastic materials. The present workextends this so-called coupled stress and energy criterion to brittle crack nucleation in hyperelastic mediausing the example of silicone adhesives. For this purpose, we provide a comprehensive constitutive as wellas fracture mechanical characterization of the structural silicone adhesive DOWSIL™ 993 using a large setof experiments and propose a mixed-mode failure model for crack initiation in nonlinear elastic materials.Characterized in independent experiments, the model is used to determine critical loads of hyperelasticadhesive bonds in both shear and tension dominated configurations. For any of the examined adhesive jointconfigurations the model predicts and explains size effects and agrees well with experimental findings. Westudy stable and unstable crack propagation observed in video recordings of our experiments. It is shownthat crack initiation, crack growth and crack arrest are caused by nonmonotonic energy release rates andcan be predicted. Effects of excess energy available after crack nucleation and initial unstable crack growthare discussed.

Journal or Publication Title: Materials & Design
Volume: 182
Publisher: Elsevier
Divisions: 13 Department of Civil and Environmental Engineering Sciences
13 Department of Civil and Environmental Engineering Sciences > Institute für Structural Mechanics and Design
16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute of Structural Mechanics (FSM)
Date Deposited: 17 Nov 2019 20:55
DOI: 10.1016/j.matdes.2019.108057
Official URL: https://tuprints.ulb.tu-darmstadt.de/9297
URN: urn:nbn:de:tuda-tuprints-92970
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