Related Experiment Video
Updated: May 20, 2025
Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
Published on: May 2, 2016
High-pressure and high-temperature thermoelasticity of tantalum: An ab initio study
X Gong1, A Dal Corso1,2
1International School for Advanced Studies (SISSA), Via Bonomea 265, 34136 Trieste, Italy.
Abstract:
We present the thermoelastic properties of the body-centered cubic tantalum calculated within the quasi-harmonic approximation (QHA) and compare them with those given by the quasi-static approximation (QSA) and those measured experimentally. We find that the QHA temperature dependent elastic constants (TDECs) follow the experiment very well from 5 K up to 500 K, and in this range of temperatures are in better agreement with the experiment than the QSA TDECs. At higher temperatures, our QHA results are linear with temperature and fail to follow the measured change in slope of C(T) and C44(T) that become parallel to the QSA results. We also present our QHA pressure dependent elastic constants at 5, 300, 1000, and 1500 K.
Related Concept Videos
01:19Thermal Strain
01:27Thermal expansion and Thermal stress: Problem Solving
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in...