High temperature characterization and material model calibration for hot stamping of AA7075 aluminium sheet

International Deep Drawing Research Group 37th Annual Conference

Amours, G.D.^1 ; Ilinich, A.^2

National Research Council Canada, Aluminium Technology Centre, Saguenay

QC, Canada^1

Ford Research and Innovation Center, Dearborn

MI, United States^2

关键词: Damage model;    Elevated temperature;    High temperature;    Hot-stamping;    LS-DYNA;    Material modeling;    Non-associated flow rule;    Non-isothermal condition;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/418/1/012034/pdf
DOI  :  10.1088/1757-899X/418/1/012034

来源: IOP

【 摘 要 】

This paper presents an overview of the elevated temperature characterization of AA7075 aluminium sheet and calibration of a custom material model implemented in LS-DYNA. The plasticity characterization was performed by isothermal tensile testing while formability characterization was performed via isothermal Nakazima testing in a wide range of temperatures and strain rates. A special heat treatment path representative of the hot stamping was developed and applied in both series of tests. The material model included Hill'48 yield with a non-associated flow rule and phenomenological damage model similar to GISSMO but extended to cover non-isothermal conditions.