Dynamic Constitutive Parameter Calibration and Johnson-Cook ModelValidation for Nickel-based Single-crystal Superalloy DD6
SHI Jianjun1,*, LIU Lin2, LI Tingxin2, CHEN Chen1
1 School of Aeronautics and Astronautics, Southwest University of Science and Technology, Mianyang 621000, Sichuan, China 2 School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621000, Sichuan, China
Abstract: This study presents a systematic calibration and validation of the Johnson-Cook (J-C) constitutive model for the domestic second-generation nickel-based single-crystal superalloy DD6, specifically along the [001] orientation, targeting its application in aero-engine turbine blades. To accurately characterize its dynamic mechanical response, tensile and compressive tests were conducted over a wide temperature range (room temperature to elevated temperatures) and a wide range of strain rates (from quasi-static to high strain rates) utilizing a universal testing machine and a split Hopkinson pressure bar system. Based on the experimental data, a complete set of J-C constitutive parameters for the DD6 alloy in the [001] orientation was determined. Furthermore, failure parameters within the J-C damage model (d1, d2, d3, d5) were calibrated using quasi-static tensile tests on notched specimens at room temperature. The predictive capability of the calibrated J-C model was validated by combined experimental and finite element analysis of surface residual stresses induced by milling. The results demonstrated that the J-C model accurately predicts the distribution of the machining-induced residual stress, with an average error of only 7.73% between simulation and experimental measurements. The findings confirm that the DD6 alloy in the [001] orientation exhibits significant strain rate strengthening and temperature softening effects, and the established constitutive model demonstrates reliable engineering applicability.
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2026, Vol. 40 
