# Engineering Mechanics

Proceedings Vol. 32 (2026)

ENGINEERING MECHANICS 2026

Copyright © 2026 Institute of Thermomechanics of the Czech Academy of Sciences, Prague

 

Novotný R., Šebek F.
pages 93 - 96, full text

The influence of temperature and strain rate on the hardening behaviour of three metallic materi- als is studied. Standard tensile tests were carried out under quasi-static, dynamic, and elevated temperature conditions, including static tensile tests with loading pauses to determine the static stress–strain response of AISI 316L steel, Inconel 718 and EN AW 2024-T351. Then the constitutive model was calibrated using a parti- cle swarm optimization and subsequently validated through finite element simulations performed in LS-DYNA. The calibrated models showed good agreement with the experimental data up to the ultimate tensile strength. Larger errors occurred beyond the ultimate tensile strength due to a slight overestimation of the strain harden- ing exponent. The thermal softening parameter was not identified for Inconel 718 because elevated-temperature tests were not performed for this nickel-based alloy. Despite this limitation, calibrated material models provide sufficient accuracy for engineering simulations and structural design applications under moderate strain rates and elevated temperatures.

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