Campus Units

Ames Laboratory, Materials Science and Engineering

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

7-15-2021

Journal or Book Title

Acta Materialia

First Page

117162

DOI

10.1016/j.actamat.2021.117162

Abstract

A critical need to accurately model thermal behaviors of materials that exhibit strong elastocaloric effects, including predicting the effects themselves at varying stresses and temperatures, has been addressed using a simple and versatile physics-based approach. The key factor leading to the high precision is approximating the underlying elastic phase transition as a smooth modification of lattice entropy between coexisting phases. Once the phase transformation entropy is modeled to match experimentally measured strain as a function of temperature and applied stress, estimating the heat capacity, entropy, and isothermal entropy and adiabatic temperature changes in temperature-stress coordinates becomes straightforward. This approach provides insight into how thermal properties of elastocaloric materials vary through the transition based on strain measurements that are simple to perform and interpret. In addition to aiding in the rapid evaluation of new and existing elastocaloric materials, this advance is expected to prove invaluable for accurate heat transfer modeling aimed at designing efficient regenerative elastocaloric cooling devices.

Comments

This is a manuscript of an article published as Griffith, L. D., B. P. Alho, A. Czernuszewicz, P. O. Ribeiro, J. Slaughter, and V. K. Pecharsky. "Toward efficient elastocaloric systems: Predicting material thermal properties with high fidelity." Acta Materialia (2021): 117162. DOI: 10.1016/j.actamat.2021.117162. Posted with permission.

Copyright Owner

Acta Materialia Inc.

Language

en

File Format

application/pdf

Available for download on Saturday, July 15, 2023

Published Version

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