CONSTITUTIVE MODEL CONSTANTS FOR LOW CARBON STEELS FROM TENSION AND TORSION DATA

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Low carbon C1010 steel is characterized under tension and torsion to determine Johnson‐Cook (J‐C) strength model constants. Constitutive model constants are required as input to computer codes to simulate projectile (fragment) impact on structural components made of this material. J‐C model constants (A, B, n, C, and m) for the alloy are determined from tension and torsion stress‐strain data. Reference tension tests are performed at a strain rate of ∼1/s at room temperature. Tests at high strain rates are performed at temperatures to 750 °C. Torsion tests at quasi‐static and high strain rates are performed at both room and high temperatures. Equivalent plastic tensile stress‐strain data are obtained from torsion data using von Mises flow rule and compared directly to measured tensile data. J‐C strength model constants are determined from these data. Similar low carbon steels (1006, 1008, and 1020) have their J‐C constants compared.