| Autor: |
Sparr, Holger, Roszak, Robert, Sagradov, Ilja, Schob, Daniela, Ziegenhorn, Matthias |
| Předmět: |
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| Zdroj: |
PAMM: Proceedings in Applied Mathematics & Mechanics; Dec2021, Vol. 21 Issue 1, p1-2, 2p |
| Abstrakt: |
The objective of this work is the application of viscoplastic material models in a consistent thermomechanical framework to make use of infrared thermography as one source of a phenomenological model validation. The thermomechanical foundation led to the understanding, that each mechanical deformation can be analysed as a thermodynamical process. The usual balance equations applied in a mechanical process are completed by the first and second law of thermodynamics. In this setup, the classical stress‐strain characteristics is accompanied by the temperature evolution and the evolution of derived quantities such as the energy resp. energy‐rate transformation ratio (ETR). These three characteristics combined can improve the assessing procedure of the investigated deformation load path qualitatively as well as quantitatively. The initial boundary value problem of the coupled displacement and temperature fields is experimentally well supported by a high‐resolution infrared camera. A reduced thermal boundary value control simplifies the experimental measures to be realised. It is shown in the analysis, that the attained surface temperature accuracy is well‐suited for the identification of model parameters related to dissipative deformation phenomena. The common split into different fractions of free energy allows a detailed evaluation in terms of hardening related stored energy and other derived state entities. The potential of the instantaneous rate of energy storage is with respect to the comparability of different modelling approaches explained and is illustrated by experimental results. As a further consequence, a more complex tensile testing regime is proposed to validate the applied material model for metals. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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