Transcription of The Mechanical Properties of Glass
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The Mechanical Properties of Glass
Introduction to Glass Technology1 The Mechanical Properties of GlassTheoretical strength, practical strength, fatigue, flaws, toughness, chemical processesGlass Engineering150:312 Professor Richard LehmanDepartment of Ceramics and Materials EngineeringRutgers University, New Brunswick, New Jersey, USAS pecific Strength and Stiffness of Selected Bulk [specific strength]E/p [spe cific stiffne ss]TitaniuMagnesiumAluminum 2014-T6 SteelSteel, hot rolled, 1% CMagnesiumSteelTitaniuGlassGlass, Chem TemperedGlass, Phys. TemperedAluminum, 1100-H14 Introduction to Glass Technology2 Most glasses have strong covalent bonds Si-O bonds, 435 kJ/mole Yields theoretical strength of 17 GPa Practical strength is much less Depends on flaws, usually on surface9scratches9bubbles9inhomogeneitie s9inclusions9any mechanically distinguishable phase Manufactured Glass has nominal strength of 70 MPa [10 KPsi] Design stresses often 7 MPa or less for high reliability structures Low surface area structures [ fibers] have higher strengthsTheoretical Strength of GlassUni
Introduction to Glass Technology 1 The Mechanical Properties of Glass Theoretical strength, practical strength, fatigue, flaws, toughness, chemical processes
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