1984/01/01 by W. Kiefer, Kiefer, Werner
Engineering · #660 #Physics and Engineering Research Articles #Radiative Heat Transfer Studies #Structural Analysis of Composite Materials
paper · doi:10.34657/14427
openalex publication_date 1984/01/01 · openalex created_date 2016/08/23 · openalex updated_date 2026/07/01
Simplified model assumptions are used to develop formulae for estimating the attainable compressive stresses produced in glass plates by thermal toughening for glasses with thermal expansion coefficients from 3,25 to 9,0 · 10-6 K-1 The formulae allow the operator to estimate the attainable compressive stress for a given glass in defined toughening conditions or the details of the procedure needed to produce a desired stress in a particular glass. The formulae require only the basic data for the glass (thermal expansion α, Young's modulus E, Poisson's ratio μ, transformation temperature Tg, glass thickness d), easily determined parameters for the toughening rig (heat transfer coefficient α', heating temperature TA and temperature of the quenching medium T∞), the thermal conductivity of the glass and the bending strength of the glass plate. An efficient thermal conductivity is given for transparent glasses because conductivity varies with temperature. Α range of toughening procedures are considered, which cover, because of their different heat transfer coefficients, the whole field of technical glasses with heat transfer coefficients between 9 · 10-6 K-1 (soda-lime-silica) and 3,25 · 10-6 K-1 (borosilicate, e.g. Schott-Glas 8330).