Publikacje

Abstract:

In the paper the calibration technique of the true stress - logarithmic strain curves is proposed, based on the modified Bai-Wierzbicki method. Calibration was done using four various specimen geometries selected to provide a wide range of stress triaxialities and Lode parameters. The level of plasticity was controlled by selection of three various materials tested at three temperatures: +20ºC, -20ºC, -50ºC. Modification of Bai-Wierzbicki method includes another way of computing the stress triaxiality and Lode parameter, taking into account the evolution of these parameters during the loading process. Also the material softening was included before the final failure.

B I B L I O G R A F I ABai, Y., Wierzbicki, T., 2008. A new model plasticity and fracture with pressure and Lode dependence. International Journal of Plasticity 24, 1071–1096.
Algarni, M., Bai, Y., Choi, Y., 2015. A study of Inconel 718 dependency on stress triaxiality and Lode angle in plastic deformation and ductile fracture. Engineering Fracture Mechanics 147, 140–157.
Bai, Y., Wierzbicki, T., 2010. Application of extended Mohr–Coulomb criterion to ductile fracture. International Journal of Fracture 161, 1–20.
Neimitz, A., Galkiewicz, J., Dzioba, I., 2018. Calibration of constitutive equations under conditions of large strains and stress triaxiality. Archives of Civil and Mechanical Engineering18/4, 1123–1135.

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Calibration of constitutive equations for the stress level estimation in domain with the large strains