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A Novel Description of Thermomechanical Behavior Using a Rheological Model

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Abstract:

Isothermal cyclic stress-strain deformation and thermomechanical deformation (TMD) of 429EM stainless steel were analyzed using a rheological model employing a bi-linear model. The proposed model was composed of three parameters: elastic modulus, yield stress and flow stress. Monotonic stress-strain curves at various temperatures were used to construct the model. The yield stress in the model was nearly same as 0.2% offset yield stress. Hardening relation factor, m, was proposed to relate cyclic hardening to kinematic hardening. Isothermal cyclic stress-strain deformation could be described well by the proposed model. The model was extended to describe TMD. The results revealed that the bi-linear thermomechanical model overestimates the experimental data under both in-phase and out-of-phase conditions in the temperature range of 350-500oC and it was due to the enhanced dynamic recovery effect.

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Periodical:

Key Engineering Materials (Volumes 306-308)

Pages:

205-210

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.306-308.205

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Online since:

March 2006

Authors:

Keum Oh Lee, Seong Gu Hong, Soon Bok Lee

Keywords:

Cyclic Hardening, Elevated Temperature, Rheological Model, Thermo-Mechanical Fatigue (TMF)

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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References

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