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Thermal and Structural Property Characterization of Commercially Moldable Glasses

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In this paper, we report the development of a kinetic model for precisely predicting glass material property response to a defined molding profile. The glass viscosity, thermal expansion, and specific heat properties for two commercial optical glasses, P-SK57 and L-BAL35 were measured and are reported in this paper. These data were used with the Tool–Narayanaswamy–Moynihan (TNM) model for glass structural relaxation in order to develop a thermal expansion model that simulates the glass workpiece changes through the critical cooling profile where the final workpiece shape is determined. The results show a structural relaxation model incorporated into an ABAQUS FEM code that precisely models the thermal expansion behavior acknowledging that the theory of structural relaxation is a critical element in predicting the final size and shape of a molded lens.
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Document Type: Research Article

Affiliations: 1: School of Materials Science and Engineering, Center for Optical Materials Science and Engineering Technology (COMSET), Clemson University, Clemson, South Carolina 29631 2: Department of Mechanical Engineering, Clemson University, Clemson, South Carolina 29631 3: Department of Mathematical Sciences, Clemson University, Clemson, South Carolina 29631 4: SCHOTT AG, 55014 Mainz, Germany

Publication date: August 1, 2010

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