TITLE:
Improved Approach to Determine the Material Parameters for a Combined Hardening Model
AUTHORS:
Benjamin Seisenbacher, Gerhard Winter, Florian Grün
KEYWORDS:
Low Cycle Fatigue, Simulation, Combined Hardening Model, Parameter Estimation, Plasticity
JOURNAL NAME:
Materials Sciences and Applications,
Vol.9 No.4,
April
16,
2018
ABSTRACT: For the simulation of isothermal mechanically loaded
components, it is indispensable to have a material model, which describes the
material behavior very accurately. In this case, a combined hardening model was
chosen in order to reflect the prevalent deformation behavior. The combined
hardening model enables simulation independent of the number of load cycles and
the chosen strain amplitude. The main point is the declaration of the
parameters from the chosen material model. This work deals with the estimation
of the parameters. For validation and as input data of the here defined
approach low cycle fatigue (LCF) tests were performed on cast aluminum and at
250°C. The comparison of the test results and the simulations indicated that σmax from the simulated
hysteresis lies inside a range of ±5% referred to the test results.