Sub-T_g viscoelastic behaviour of chalcogenide glasses, anomalous visrnus flow and stress relaxation(<Feature>Fracture and Related Phenomena of Glasses)

概要

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Stress relaxation and viscous flow of Ge_xSe_<1-x> and TAS chalcogenide glasses were studied using the "bending method". Inadequacy of common models or functions to describe relaxation process of inorganic glasses were proved and the origin of an unexpected relaxation behaviour is discussed. Even if most part of the stress relaxes for short period (10 to 20 days), a significant part still remains (from 5 to 33%) after over one year. A linear viscoelastic behaviour has been demonstrated in the sense of an independence of the relaxation function to the stress level. However, the apparent viscosity seems to increase of almost one order of magnitude in only one month (from 5 10^<15> to 3 10^<16> Pa-s for TAS fibers) independently of strain or stress level, that is characteristic of glass structural changes.
社団法人日本セラミックス協会の論文
2008-08-01