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Modeling Fracture Behavior in Precision Glass Molding.

Author: Gang Liu
Publisher: Aachen : Apprimus Wissenschaftsverlag, 2018.
Series: Ergebnisse aus der Produktionstechnik, Band 25/2018
Edition/Format:   eBook : Document : EnglishView all editions and formats
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Genre/Form: Electronic books
Additional Physical Format: Print version:
Liu, Gang.
Modeling Fracture Behavior in Precision Glass Molding.
Aachen : Apprimus Wissenschaftsverlag, ©2018
Material Type: Document, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Gang Liu
ISBN: 9783863596422 3863596420
OCLC Number: 1050850487
Description: 1 online resource (149 pages).
Contents: Intro; Table of Contents; Abstract; Kurzzusammenfassung; Symbols and Abbreviations; 1 Introduction (Background and Motivation); 1.1 Precision glass molding process; 1.2 FEM simulation of precision glass molding process; 1.3 Fracture in precision glass molding process; 2 State of the Art; 2.1 Glass material and properties; 2.1.1 Composition and atomic structure of optical glasses; 2.1.2 Optical properties; 2.1.3 Density; 2.1.4 Constitutive behaviors; 2.1.5 Thermal expansion; 2.1.6 Heat capacity; 2.1.7 Thermal conductivity; 2.1.8 Friction coefficient; 2.2 Fracture mechanics. 2.2.1 Theoretical strength of glass2.2.2 Micro defects in optical glasses; 2.2.3 Fracture theory; 2.2.4 Statistical fracture theory; 3 Hypothesis and Research Approach; 3.1 Current situation and goal of research; 3.2 Hypothesis; 3.3 Research approach; 4 Observation Systems and Metrology; 4.1 Machine system; 4.2 Glass materials; 4.3 Molding tools; 4.4 Metrology; 4.4.1 Measurement of glass fractural behavior; 4.4.2 Comparison between three- and four-point bending tests; 4.4.3 The four-point bending test; 4.4.4 The three-point bending test; 5 Modelling Fracture Behavior. 5.1 Determination of necessary properties of selected glasses5.1.1 Viscosity (VFT equation); 5.1.2 Stress-relaxation and thermo-rheological simplicity; 5.1.3 Temperature dependent elastic moduli; 5.2 The stress-strain behavior of glass under a constant strain rate; 5.2.1 Constitutive behavior (single Maxwell element); 5.2.2 Temperature dependence (single Maxwell element); 5.2.3 Measurement of temperature-dependent Young's modulus; 5.2.4 The stress-strain behavior for generalized Maxwell model; 5.2.5 Strain energy density under a constant strain rate; 5.3 Brittle-ductile transition. 5.3.1 Design of experiments5.3.2 Experimental results and analysis; 5.3.3 Conclusion of brittle-ductile transition; 5.4 Statistical fracture analysis; 5.4.1 Experimental results and analysis; 5.4.2 Conclusion of statistical fracture analysis; 6 Prediction of Fracture based on FEM Simulation; 6.1 Fracture of lens in molding experiment; 6.2 FEM simulation of the PGM process; 6.2.1 Schematic model of the PGM process; 6.2.2 FEM model of the PGM process; 6.2.3 Simulation results; 6.3 Calculation of the fracture probability in the PGM process. 6.3.1 Procedure of statistical fracture analysis for the PGM process6.3.2 Results of statistical fracture analysis; 7 Process Optimization based on Fracture Prediction; 7.1 Influence of key process parameters on fracture probability; 7.1.1 Design of experiment; 7.1.2 Investigation results of the influence of key process parameters; 7.2 Optimization of key process parameters; 7.2.1 Definition of objective function; 7.2.2 Optimization procedure and results; 7.3 Improved process chain of PGM; 8 Conclusion and Perspective; Bibliography.
Series Title: Ergebnisse aus der Produktionstechnik, Band 25/2018

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