Quick Calibration of Fracture Behaviors in TC128 Steel for Finite Element Modeling
From April 5, 2019, to August 20, 2020, the Volpe National Transportation Systems Center (Volpe) performed a series of finite element (FE) analyses of uniaxial tensile tests to calibrate material models for tank car steels (TC128) from two recent side impact tests. The material models, which characterize plasticity and ductile fracture, are used in full-scale FE analyses to predict puncture of various tank car designs. This report describes the use of the Bao-Wierzbicki quick calibration procedure to model TC128 fracture. A comparison took place of material models calibrated using test results from dogbone and smooth round bar tensile geometries. Based on the FE analysis results, researchers made recommendations for quick calibration of fracture in TC128.