Abstract
This study is concerned with the development of a fracture criterion for the impact fracture of jointed steel plates of a bolted joint used in a car body. For the accurate prediction of crash characteristics of car bodies by computer-aided engineering (CAE), it is also necessary to examine the behavior and fracture of jointed steel plates subjected to impact loads. Although the actual impact fracture of jointed steel plates of a bolted joint used in cars is complicated, for simplifying the problem it might be classified into the shear fracture and the extractive fracture of jointed steel plates. Attention is given to the extractive fracture of jointed steel plates in this study. The extractive behavior and fracture of three kinds of steel plates used for cars are examined in experiments and numerical simulations. The impact extraction test of steel plates jointed by a bolt is performed using the one-bar method, together with the static test. In order to understand the mechanism of extractive fracture process of jointed steel plates, numerical simulations by a FEM code LS-DYNA are also carried out. The obtained results suggest that a stress-based fracture criterion may be developed for the impact extractive fracture of jointed steel plates of a bolted joint used in a car body.
Highlights
In the automotive industry collision safety and reliability of cars under impact loading has become more important in recent years, together with lightening of car body for reduction of CO2 emission
This study is concerned with the development of a fracture criterion for the impact fracture of jointed steel plates of bolted joints used in car bodies
It is expected from the present study that a stress-based fracture criterion is developed for the impact extractive fracture of jointed steel plates of a bolted joint used in a car body
Summary
In the automotive industry collision safety and reliability of cars under impact loading has become more important in recent years, together with lightening of car body for reduction of CO2 emission. This study is concerned with the development of a fracture criterion for the impact fracture of jointed steel plates of bolted joints used in car bodies. The impact extractive behavior and fracture of three kinds of steel plates used for car bodies are examined in experiments and numerical simulations. In order to understand the mechanism of extractive fracture process of the jointed steel plates, numerical simulations by a FEM code LS-DYNA are carried out. It is expected from the present study that a stress-based fracture criterion is developed for the impact extractive fracture of jointed steel plates of a bolted joint used in a car body
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