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From bulk to structural failure: fracture of hyperelastic materials

Rosendahl, Philipp Laurens (2020):
From bulk to structural failure: fracture of hyperelastic materials.
Darmstadt, Technische Universität Darmstadt,
DOI: 10.25534/tuprints-00008693,
[Ph.D. Thesis]

Abstract

This thesis investigates the fracture of nearly incompressible hyperelastic media. It covers the different characteristics of bulk material failure under dilatational or distortional loads and develops a unified description of the corresponding failure surface. It proposes a coupled strain and energy failure criterion for the assessment of notch-induced crack nucleation and presents a weak interface model that allows for efficient stress, strain and failure analyses of hyperelastic adhesive lap joints. Theoretical concepts for the measurement of fracture properties of nonlinear elastic materials are provided. The methodology is developed using two exemplary hyperelastic silicones, DOWSIL 993 Structural Glazing Sealant and DOWSIL Transparent Structural Silicone Adhesive, and is validated using large sets of experiments of different loading conditions.

Item Type: Ph.D. Thesis
Erschienen: 2020
Creators: Rosendahl, Philipp Laurens
Title: From bulk to structural failure: fracture of hyperelastic materials
Language: English
Abstract:

This thesis investigates the fracture of nearly incompressible hyperelastic media. It covers the different characteristics of bulk material failure under dilatational or distortional loads and develops a unified description of the corresponding failure surface. It proposes a coupled strain and energy failure criterion for the assessment of notch-induced crack nucleation and presents a weak interface model that allows for efficient stress, strain and failure analyses of hyperelastic adhesive lap joints. Theoretical concepts for the measurement of fracture properties of nonlinear elastic materials are provided. The methodology is developed using two exemplary hyperelastic silicones, DOWSIL 993 Structural Glazing Sealant and DOWSIL Transparent Structural Silicone Adhesive, and is validated using large sets of experiments of different loading conditions.
Place of Publication: Darmstadt
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute of Structural Mechanics (FSM)
Date Deposited: 10 Jun 2020 14:06
DOI: 10.25534/tuprints-00008693
Official URL: https://tuprints.ulb.tu-darmstadt.de/8693
URN: urn:nbn:de:tuda-tuprints-86934
Referees: Becker, Prof. Dr. Wilfried and Altenbach, Prof. Dr. Holm
Refereed / Verteidigung / mdl. Prüfung: 27 May 2020
Alternative Abstract:
Alternative abstract Language

Diese Arbeit untersucht das Versagen von nahezu inkompressiblen hyperelastischen Materialen. Es werden die unterschiedlichen Versagensmoden bei Volumen- und Gestaltänderung dieser Materialen beleuchtet und eine einheitliche Beschreibung der Versagensfläche entwickelt. Die Arbeit schlägt ein gekoppeltes Dehnungs- und Energieversagenskriterium zur Beurteilung kerbinduzierter Rissbildung vor und stellt ein semi-analytisches Modell vor, das effiziente Spannungs-, Dehnungs- und Versagensanalysen hyperelastischer Überlappungsklebfügungen ermöglicht. Es werden theoretische Konzepte zur Messung bruchmechanischer Werkstoffkennwerte für nichtlinear-elastische Materialien bereitgestellt. Die Methodik wird beispielhaft anhand von zwei hyperelastischen Silikonen, DOWSIL 993 Structural Glazing Sealant und DOWSIL Transparent Structural Silicone Adhesive, entwickelt und anhand umfangreicher experimenteller Befunde mit unterschiedlichen Belastungen validiert.

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