Unveiling the Strain Rate Sensitivity of G18NiCrMo3-6 CAST Steel in Tension/Compression Asymmetry

Barış Çetin , Emin Bayraktar (1, 2) , Ozgur Aslan (3)

1 QUARTZ - Laboratoire QUARTZ
2 ISAE-Supméca - ISAE-Supméca Institut Supérieur de Mécanique de Paris
3 Atilim University

This research was devoted to unveiling the strain rate sensitivity (SRS) of G18NiCrMo3-6 cast steel in tension/compression asymmetry. For that purpose, detailed mechanical characterization tests were conducted providing a process window covering quasi-static and medium strain rate regimes (0.001, 0.1, 10 [s−1]) in tension and compression states. Through this experimental effort, the SRS of the material could be extracted by a function of strain and the strain rate which enabled us to create a mathematical expression to easily be implemented as a state variable for constitutive material modeling. Finally, a pressure- and rate-dependent constitutive material model on the basis of the Cocks’89 yield locus definition was created using a subroutine (UMAT) file and the material parameters were verified with respect to the experimental data. The UMAT file also takes into account the tension/compression asymmetry in yielding to handle the effect of the porous media plasticity concept. The predictions of the proposed material model are in line with the experimental outputs.

Mots clés: strain rate sensitivity; G18NiCrMo3-6; cast iron plasticity; Mathematical Modeling

Domaines: Sciences de l'ingénieur [physics]; Mathématiques [math]

Barış Çetin, Emin Bayraktar, Ozgur Aslan. Unveiling the Strain Rate Sensitivity of G18NiCrMo3-6 CAST Steel in Tension/Compression Asymmetry. Applied Sciences, 2023, 13 (21), pp.11891. ⟨10.3390/app132111891⟩. ⟨hal-04265550⟩