Confirmation of Johnson-Cook Model Parameters for Nimonic 80A alloy by Finite Element Method

Year 2020, , 625 - 632, 01.09.2020

Mehmet Erdi Korkmaz , Mustafa Günay

https://doi.org/10.2339/politeknik.555271

Cited By: 2

Abstract

Nimonic
80A superalloy is frequently used due to its high creep resistance, oxidation
resistance and high resistance to high temperature corrosion. On the other
hand, due to compatibility of simulation of plastic deformation processes,
Johnson-Cook model is chosen among the materials models such as Zerille
Armstrong, Bordner Partom, Steinberg-Guinan etc. In this study, primarily,
quasi-static compression tests were performed for 10-3, 10-2 and 10-1 s-1
strain rates at room temperature. Secondly, dynamic compression tests were
secondly conducted at high strain rates ranging from 370 to 954 s-1 using the
Split Hopkinson Pressure Bar (SHPB) apparatus. Then, the compression tests were
conducted at a temperature level from 24~200 °C at the reference strain rate.
Johnson-Cook model parameters of Nimonic 80A were determined by analyzing the
data obtained from the tests. Lastly, the compression simulations with finite
element method (FEM) were performed in ANSYS Workbench to confirm the accuracy
of the parameters. In the light of the results, it was determined that there is
an average of %3.23 deviation between the experimental and the simulation
values. The result showed that accuracy of the Johnson-Cook parameters for
Nimonic 80A superalloy was verified with FEM.

Keywords

Nimonic 80A, johnson-cook parameters, finite element method, split-hopkinson pressure bar

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