Nonlinear Finite Element Modeling of Charpy Impact Test
Finite element modeling of Charpy impact test was performed for a normalized carbon steel specimen based on plane strain geometry and bilinear isotropic hardening plasticity. As the suggested approach takes into account all aspects of nonlinearity such as geometric, material and contact nonlinearities, it may describe the conventional destructive impact test accurately with much less effort and cost. A failure criterion is assumed to be at 10 % of plastic strain based on the tensile experiment data. Impact energy was estimated at different testing temperatures. It was found that impact energy required for fracture of the selected steel specimen at room temperature (i.e. 25 °C) is to be 65.9 Joul. According to simulation results, it is found that the ductile to brittle transition temperature (DBTT) equals 0 °C. In order to validate the numerical model, a comparison study was established by comparing the numerical results with the corresponding experimental tests at the same conditions, which shows good match with maximum deviation of 5 % for all computer runs.
M. S. J. Hashmi, B. S. Yilbas and S. Naher
F. A. Ghaith "Nonlinear Finite Element Modeling of Charpy Impact Test", Advanced Materials Research, Vols. 83-86, pp. 182-189, 2010