کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
674477 1459562 2011 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Simulation of temperature history-dependent phenomena of glass-forming materials based on thermodynamics with internal state variables
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Simulation of temperature history-dependent phenomena of glass-forming materials based on thermodynamics with internal state variables
چکیده انگلیسی

In ref. [1], a profound ansatz for modelling the various phenomena associated with the glass-transition was presented. It extends classical theories, such as the concept of fictive temperature or order parameters, for example, in two ways. Firstly, temperature excitations as well as mechanical loadings are accounted for in a single consistent approach. Secondly, it is not formulated in the θ–p–V   space, but rather in the θ–T̲̲–E̲̲ space, taking the tensor character of stress T̲̲ and strain E̲̲ into account. Hence, it is a three-dimensional theory where the basic thermodynamic potential, the Gibbs free energy, depends on the stress tensor, the temperature and a set of internal variables. In the current article, expressions for the enthalpy, the entropy, the thermal expansion and the specific heat are derived. The specific heat and the thermal expansion behaviour are looked at for various temperature excitations. It is shown, that the results are in accord with experimental observations in literature.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 522, Issues 1–2, 10 August 2011, Pages 182–193
نویسندگان
, , ,