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Publikationsnummer FBCH002
Autor Weißmann, R.; Varner, J.; Nattermann, K.; Müller-Simon, H.
 
Titel
Strength of Glass - Basics and Test Procedures - ICG Advanced Course 2003
 
Stichworte
Bruch (Fehler); Festigkeit
 
Journal
Veröffentlichungsjahr 2003
Band
ISS
Seite 117
 
Kurzbeschreibung
Many applications of glass are predominantly determined by its strength behaviour which depends on the geometry, the stress state and the surface nature of the glass product, but also on the type and duration of the loading.
Glass possesses a high Young's modulus, which is comparable with that of metals and thus enables the fabrication of products with high rigidity - in contrast to polycarbonate with a much lower Young's modulus. However, glass - as a brittle-elastic material - is susceptible to fracture and due to its chemical reactivity also to static fatigue.
It is the goal of the ICG Advanced Course to secure the most essential basics of stress formation, crack propagation and statistical evaluation of fracture events and, furthermore, to introduce the relevant methods of stress and strength measurements as well as the fractographic characterisation of fracture surfaces as a means to elucidate failure causes.
The Advanced Course addresses employees of the glass industry in the field of production, processing, application and testing as well as all engineers and scientists who are not experts in this particular topic but look for a sound introduction.
The lecturers of the Advanced Course have long-standing practical experience of solving problems and offering solutions in the field of glass strength and thus fulfil the requirements for an updated and practice-oriented knowledge transfer.
Contents
Stresses and Stress Measurements in Glasses
(R. Weißmann)
Introduction
Basic Concepts of Stress and Strain Stress and Strain Formulations
General Approach to Reduce the Complexity of Problem Permanent and Temporary Residual Stresses Examples for Stresses in Glass Stresses in Flat Glass
Stresses in Glass Container Inclusions in Glass Stresses by Contact Load Stress Measurement in Glass Transmission Light Method Scattered Light Method Literatur

Strength and Fracture Mechanics of Glass
(J. Varner)
Introduction and Overview
Theoretical Strength Practical Strength Griffith Equation
Common Methods for Measuring Strength Fracture Toughness
Relationship Between Strength and Fracture Mechanics Static Fatigue
Slow Crack Growth Literature

Fracture Statistics
(K. Nattermann)
Abstract
Statistical Interpretation of Strength Measurements Elementary Evaluation of Random Samples Fracture Probability Distributions Interpretation and Application of Fracture Statistics Elementary Evaluation of Fracture Statistics Extrapolation to Small Loads and/or Large Sample Sizes Notes an the Sample Size
Dependence of Fracture Statistics an the Processing Quality Handling of Outliers
Fracture Statistical Evaluation of Finite-Element Analyses Lifetime Estimations
Stress Corrosion and Aging
Determination of the n-Value with the Dynamic Method Lifetime Estimations Basing in Stress Corrosion Fitting of Statistical Distributions to Samples Graphical Procedures
Mathematical Methods for Parameter Estimations Hypothesis testing
Literature and Further Readings

Strength of container glass
(H. Müller-Simon)
Introduction
Strength reducing influences and possible counter measures
Melting relics
Influence of forming Influence of handling Influence of shape Residual stresses Coating
Strength Measurements Internal Pressure Strength Vertical Load Impact Strength
Thermal Shock Resistance Test Measurement of residual stress Line Simulator
Online Measuring Techniques Testing of coatings Summary
Literature

Fractographic Investigations
(J. Varner)
Introduction and Overview
Definition of Fractography Fundamentals of Fractography Information Provided by Fractography Applications of Fractography Law of Normal Tension Fracture Markings
Fracture Origin Fracture Mirror Arrest Lines Wallner Lines Hackle
Fracture Markings Produced at Low Velocities (Scarps) Contact Cracks an the Glass Surface Impact with Sharp Objects
Impact with Blunt Objects Quantitative Fractography Fracture Mirror Constant
Relationship Between Crack Size and Fracture Toughness Literature
General Literature Concerning Fractography Literature Concerning Quantitative Fractography
ISBN 3-921089-37-9
(Auch auf deutsch erhältlich: HVG-Fortbildungskurs 2001 - Festigkeit von Glas, Grundlagen und Messverfahren)
 
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