ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Consistent model including structural relaxation is necessary for correct glass stress calculation innumerical computations of glass forming processes. Calculation of glass relaxation phenomena isoften done by combining independent empirical formula on stress relaxation (for a simpletemperature regime) and independent model of time-temperature dependence on Tool fictivetemperature, Tf. Another approach was developed and verified here. Tool-Narayanaswamyand Moynihan/Mazurin relaxation model was adopted. Relaxation was obtained not from empiricalmodel, but from calculated time-temperature dependence of Tool fictive temperature (Tf), dynamicviscosity, heat capacity and coefficient of thermal expansion. Heat conduction in a glass probe ofknown temperature history, structural relaxation and stress calculation were used in onecomputation scheme using Matlab. The stress of glass probe was measured using polarized light(Senarmont method). Rather high stress computation accuracy was obtained in comparison to stressexperimental results. The applied model approach is being to be extended for application incommercial finite element codes for modeling of glass forming processes
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.39-40.529.pdf
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