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Title: Elastic-viscoplasticity modeling of the thermo-mechanical behavior of chalcogenide glass for aspheric lens molding
Authors: Zhou, T
Zhou, Q
Xie, J
Liu, X
Wang, X
Ruan, H 
Issue Date: Apr-2018
Source: International journal of applied glass science, Apr. 2018, v. 9, no. 2, p. 252-262
Abstract: Chalcogenide glass (ChG), as an alternative material in place of single-crystal germanium, is increasingly used in thermal imaging, night vision, and infrared guidance systems, etc., owing to their excellent formability through precision glass molding (PGM). The deformation mechanisms of these glasses at the molding temperature involve elasticity, plasticity, and viscous flow, which call for a new theoretical model to assist the design of PGM process. This paper investigates the thermo-mechanical properties of Ge22Se58As20 at the temperature above its softening point and establishes a new elastic-viscoplasticity model to describe its thermo-mechanical behaviors. After determining the model parameters through cylindrical compression tests, the new constitutive model is implemented in finite element method (FEM) of PGM to form an aspheric ChG lens. And the agreement of displacement-time curves between experimental and simulation results exhibit the validity of the proposed elastic-viscoplastic constitutive model.
Keywords: Chalcogenide glass
Elastic-viscoplasticity
Finite element method
Precision glass molding
Thermo-mechanical
Publisher: John Wiley & Sons
Journal: International journal of applied glass science 
ISSN: 2041-1286
EISSN: 2041-1294
DOI: 10.1111/ijag.12290
Rights: © 2017 The American Ceramic Society and Wiley Periodicals, Inc
This is the peer reviewed version of the following article: Zhou, T., Zhou, Q., Xie, J., Liu, X., Wang, X., & Ruan, H. (2018). Elastic‐viscoplasticity modeling of the thermo‐mechanical behavior of chalcogenide glass for aspheric lens molding. International Journal of Applied Glass Science, 9(2), 252-262, which has been published in final form at https://doi.org/10.1111/ijag.12290. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
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