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dc.contributor.authorZhang, YingYing
dc.contributor.authorYin, Shaohui
dc.contributor.authorLiang, Rongguang
dc.contributor.authorLuo, Hong
dc.contributor.authorXiao, Huapan
dc.contributor.authorYuan, Ningxiao
dc.date.accessioned2020-02-25T16:35:37Z
dc.date.available2020-02-25T16:35:37Z
dc.date.issued2020-01-03
dc.identifier.citationYingying Zhang, Shaohui Yin, Rongguang Liang, Hong Luo, Huapan Xiao, and Ningxiao Yuan, "New testing and calculation method for determination viscoelasticity of optical glass," Opt. Express 28, 626-640 (2020)en_US
dc.identifier.issn1094-4087
dc.identifier.doi10.1364/oe.28.000626
dc.identifier.urihttp://hdl.handle.net/10150/637505
dc.description.abstractViscoelastic properties of glass within molding temperatures, such as shear relaxation modulus and bulk relaxation modulus, are key factors to build successful numerical model, predict forming process, and determine optimal process parameters for precision glass molding. However, traditional uniaxial compression creep tests with large strains are very limited in obtaining high-accuracy viscoelastic data of glass, due to the declining compressive stress caused by the increasing cross-sectional area of specimen in testing process. Besides, existing calculation method has limitation in transforming creep data to viscoelasticity data, especially when Poisson's ratio is unknown at molding temperature, which further induces a block to characterize viscoelastic parameter. This study proposes a systematic acquisition method tbr high-precision viscoelastic data, including creep testing, viscoelasticity calculation, and finite element verification. A minimal uniaxial creep testing (MUCT) method based on thermo-mechanical analysis (TMA) instrument is first built to obtain ideal and accurate creep data, by keeping compressive stress as a constant. A new calculation method on viscoelasticity determination is then proposed to derive shear relaxation modulus without the need of knowing bulk modulus or Poisson's ratio, which, compared with traditional method, extends the application range of viscoelasticity calculation. After determination, the obtained viscoelastic data are further incorporated into a numerical simulation model of MUCT to verify the accuracy of the determined viscoelasticity. Base on the great consistence between simulated and measured results (uniaxial creep displacement), the proposed systematic acquisition method can be used as a high accuracy viscoelasticity determination method.en_US
dc.language.isoenen_US
dc.publisherOPTICAL SOC AMERen_US
dc.rightsCopyright © 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreementen_US
dc.subjectGlassen_US
dc.subjectViscoelasticityen_US
dc.subjectCreep testingen_US
dc.subjectRelaxation modulusen_US
dc.subjectTMAen_US
dc.titleNew testing and calculation method for determination viscoelasticity of optical glassen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Coll Opt Scien_US
dc.identifier.journalOPTICS EXPRESSen_US
dc.description.noteOpen access journalen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleOptics Express
dc.source.volume28
dc.source.issue1
dc.source.beginpage626
refterms.dateFOA2020-02-25T16:35:38Z


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