Identification of 7B04 aluminum alloy anisotropy yield criteria with conventional test and Pottier test at elevated temperature

Abstract

7B04 aluminum alloy is widely used for strength critical aerospace structural applications. In this paper, the plastic anisotropy of this alloy at 200 °C was investigated based on Hill’48 and Yld2000-2D yield criteria. Thermal tensile test at setting temperature was carried out by a designed electrical heating system and the strain field was measured by the digital image correlation system simultaneously. Parameters of Hill’48 yield criterion with Voce hardening were determined directly based on the thermal tensile test. The parameters of Yld2000-2D criterion were obtained by the inverse identification method with Pottier test at elevated temperature which can generate heterogeneous strain fields. Deep drawing test was carried out at 200 °C and the earing heights were measured. The accuracy of the determined yield criteria parameters was validated by numerical and experimental deep drawing test results.