From Bulk to Structural Failure: Fracture of Hyperelastic Materials

verfasst von: Dr. Philipp Laurens Rosendahl

Verlag: Springer Fachmedien Wiesbaden

Buchreihe : Mechanik, Werkstoffe und Konstruktion im Bauwesen

Enthalten in: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik" , Springer Professional "Wirtschaft"

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Über dieses Buch

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.

Inhaltsverzeichnis

Frontmatter

Chapter 1. Introduction

Abstract

Dealing with the limited supply of resources is one of the biggest challenges of our time. Hence, technical structures must aim at maximum resource efficiency. This encourages lightweight design, which not only reduces resource requirements for the structure itself but also the energy consumption during its life, for instance, in the form of fuel for means of transportation.

Philipp Laurens Rosendahl

Chapter 2. Theoretical background

Abstract

The present work is concerned with fracture of hyperelastic materials. To allow for a mathematical description of the phenomenon, the following sections provide a brief introduction of the basic principles of continuummechanics, relevant concepts of constitutive modeling, methods for the description of bulk material failure and fundamentals of classical and modern fracture mechanics.

Philipp Laurens Rosendahl

Chapter 3. Samples and finite element models

Abstract

The present work makes use of a large set of different specimens and experiments in order to identify elastic and fracture material properties and in order to verify and validate proposed models and theories.

Philipp Laurens Rosendahl

Chapter 4. Experimental material characterization

Abstract

Modeling fracture of nearly incompressible hyperelasticmedia is challenging for several reasons: i) different failuremodes such as dilatational and distortional failuremay occur, ii) notches induce weak singularities with infinite stresses but vanishing energy release rates, iii) the onset of interface cracks is a mixed-mode fracture problem and iv) the nonlinear elastic constitutive behavior must be accounted for.

Philipp Laurens Rosendahl

Chapter 5. Bulk material failure

Abstract

Bulk material failure is observed when solids are subjected to homogeneous (multiaxial) loads. It describes critical states of materials such as the onset of yielding, damage or brittle fracture in the absence of structural features that affect the stress state and, hence, failure.

Philipp Laurens Rosendahl

Chapter 6. Nucleation of finite cracks in hyperelastic materials

Abstract

Ever since Leguillon (2002) proposed the coupled stress and energy criterion within the framework of finite fracture mechanics for the assessment of crack nucleation, many authors proved its capabilities in a multitude of structural situations.

Philipp Laurens Rosendahl

Chapter 7. Hyperelastic weak interface model

Abstract

Adhesive joints have similar geometric characteristics and dimensions inmany technical applications. Often, flat thin-walled substrates are bonded by thin adhesive layers across comparatively large surfaces.

Philipp Laurens Rosendahl

Chapter 8. Conclusions and perspectives

Abstract

This work provides a theoretical and experimental framework for the characterization and description of static failure of nearly incompressible nonlinear elastic materials.

Philipp Laurens Rosendahl

Backmatter

Titel: From Bulk to Structural Failure: Fracture of Hyperelastic Materials
verfasst von: Dr. Philipp Laurens Rosendahl
Verlag: Springer Fachmedien Wiesbaden
Electronic ISBN: 978-3-658-31605-1
Print ISBN: 978-3-658-31604-4
DOI: https://doi.org/10.1007/978-3-658-31605-1