Experimental and numerical characterization of Johnson–Cook plasticity and damage models for spheroidal graphite cast irons at high strain rates and elevated temperatures

Özcan B., Çavuşoğlu O., Çalışkan U., Aydın M., Şeker U.

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, cilt.332, ss.1-21, 2026 (SCI-Expanded, Scopus)

Özet

The utilization of finite element software for the analysis of engineering materials and industrial processes is of critical importance, and the accuracy of the results obtained from such software depends on the effectiveness of the material models used to simulate authentic material behaviour. In this study, the mechanical behaviour of industrially used EN GJS 500 and EN GJS 700 ductile cast irons in the strain rate range of 10-2 to 5x103 s − 1 Johnson-Cook (JC) plasticity and damage model parameters were determined both experimentally and numerically. The temperature range of the study was from 27◦C to 700◦C. The parameters of the JC plasticity model (A, B, n, C, m) and the parameters of the damage model (D1-D5) were characterized through a series of tests and analyses, including tensile, hot tensile, notched tensile, compression, and Split Hopkinson Compression Bar (SHPB) tests, and microstructural analysis. The damage parameters were optimized to represent the damage behaviour of the material under various conditions of triaxiality and deformation. The determined JC model parameters were integrated into finite element analysis (FEA) software to simulate the plastic deformation of the material and the onset of damage in virtual tests. A comparison of the simulation results with experimental test data, including stress–strain curves and fracture points, showed a high agreement between the data sets.