|About this Abstract
||NUMISHEET 2022: The 12th International Conference on Numerical Simulation of 3D Sheet Metal Forming Processes
||Modeling the Rate and Temperature Response of Third Generation AHSS Considering the Effect of Dynamic Strain Aging
||Xueyang Li, Christian C. Roth, Dirk Mohr
|On-Site Speaker (Planned)
The large deformation response of a 3rd GEN Advanced High Strength Steel is assessed from uniaxial tensile experiments carried out at engineering strain rates of 0.001/s, 0.1/s, 2/s and 110/s for temperatures ranging from 20°C to 480°C. A universal testing machine as well as a Split Hopkinson Pressure Bar system are used in conjunction with a customized induction heating system. The extracted true stress-plastic strain curves reveal a positive strain rate sensitivity at room temperature, with a complex dynamic strain aging effect between 120°C and 360°C. A Hill’48 yield surface with a non-associated flow rule is used to describe the anisotropy of the material. The complex strain rate, temperature and dynamic strain ageing dependent responses are modeled through a machine learning based hardening model. The numerically predicted force-displacement curves agree well with the experimental measurements, allowing for further extraction of loading paths to fracture and ductile fracture criterion calibration.
||Definite: At-meeting proceedings