Thermomechanical material modelling based on a hybrid free energy density depending on pressure, isochoric deformation and temperature
Thermomechanical material modelling based on a hybrid free energy density depending on pressure, isochoric deformation and temperature
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基于取决于压力、等容变形和温度的混合自由能密度的热机械材料建模
DOI:
10.1016/j.ijsolstr.2013.10.036
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发表时间:
2014
影响因子:
3.6
通讯作者:
Dippel
中科院分区:
文献类型:
--
作者:
Dippel
In order to represent temperature-dependent mechanical material properties in a thermomechanical consistent manner it is common practice to start with the definition of a model for the specific Helmholtz free energy. Its canonical independent variables are the Green strain tensor and the temperature. But to represent calorimetric material properties under isobaric conditions, for example the exothermal behaviour of a curing process or the dependence of the specific heat on the temperature history, the temperature and the pressure should be taken as independent variables. Thus, in the field of calorimetry the Gibbs free energy is usually used as thermodynamic potential whereas in continuum mechanics the Helmholtz free energy is normally applied. In order to simplify the representation of calorimetric phenomena in continuum mechanics a hybrid free energy density is introduced. Its canonical independent variables are the isochoric Green strain tensor, the pressure and the temperature. It is related to the Helmholtz free energy density by a Legendre transformation. In combination with the additive split of the stress power into the sum of isochoric and volumetric terms this approach leads to thermomechanical consistent constitutive models for large deformations. The article closes with applications of this approach to finite thermoelasticity, curing adhesives and the glass transition.
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