Title: Analysis of entropy generation rate for auxetic structures

Authors: Y. Pehlivanoğlu; M. Sunar

Addresses: Mechanical Engineering Department, Ankara Yildirim Beyazit University, Ankara, Turkey ' Mechanical Engineering Department, Ankara Yildirim Beyazit University, Ankara, Turkey

Abstract: This study presents a novel investigation of the entropy generation rate (EGR) in a re-entrant auxetic structure using finite element analysis. Timoshenko beam stiffness and mass matrices are derived using a modified couple stress theory (MCST) to capture the size effects at micro/nano scales via a length scale parameter (LSP) l. Numerical simulations show the importance of LSP on the EGR for the structure. The results indicate that as the LSP ratio l / L increases from 0 to 0.1, the peak value of the EGR during the simulation period of 0 to 0.04 seconds decreases from 6 × 10^-3 W/K to 0.3 × 10^-3 W/K.

Keywords: entropy generation rate; EGR; length scale parameter; LSP; re-entrant auxetic structure; damping; natural frequency.

DOI: 10.1504/IJEX.2026.153944

International Journal of Exergy, 2026 Vol.50 No.1, pp.28 - 37

Received: 18 Jun 2025
Accepted: 20 Jul 2025
Published online: 08 Jun 2026 *

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