Скачать или смотреть Numerical simulation of SHTB test (50SiB8), T=800°C, strain rate = 900/s

Numerical simulation (Abaqus 6.14-1/Explicit) of a SHTB test of free cutting steel 50SiB8 until rupture with T=800°C, strain rate = 900/s.


Both simulations use a Johnson-Cook flow stress model with parameters (A, B, C, m & n) according to [1]. A classic Johnson-Cook fracture strain model and a modified Johnson-Cook fracture strain model came to application with parameters for both models from [2]. A linear damage accumulation is performed and elements reaching a damage of D=1 are deleted from the analysis.

Top left (stress distribution) / right (equivalent plastic strain): prediction with classic Johnson-Cook fracture strain model
Bottom left (stress distribution) / right (equivalent plastic strain): prediction with modified Johnson-Cook fracture strain model accounting for blue-brittleness. Parameters for both models are taken from [2], a comparison to experimental data is provided with [2] as well.

[1] "Johnson Cook Flow Stress Parameter for Free Cutting Steel 50SiB8", Klippel, Gerstgrasser, Smolenicki, Cadoni, Roelofs, Wegener; 2020 (https://arxiv.org/abs/2007.14087)
[2] "Analysis of two parameter identification methods of original and modified johnson-cook fracture strains and a new fracture model considering lode angle, nonlinear thermal and bluebrittle behaviour for free-cutting steel", Gerstgrasser, Smolenicki, Akbari, Klippel, Roelofs, Cadoni, Wegener; 2020 (currently under review)