Analysing the effect of strain rate and temperature on the flow stress in AA1050 sheet using E-2448 standard

Uniaxial tests were performed to investigate the stress-strain relationship of aluminum alloy 1050 (AA1050) at different strain rates and forming temperatures. To this purpose, several coupons were cut from AA1050-H14 sheet with 2 mm thickness according to E-2448 standard in 0, 45, and 90 degrees with respect to the sheet`s rolling direction. The uniaxial tests were carried out in air and in argon gas at 100 oC, 200 oC, 300 oC, 400 oC, and 500 oC. The strain rates of the uniaxial tests were set for 0.001, 0.005, 0.0001, and 0.0005 s-1. The results show that altering the strain rate affects more the strength than the ductility attribute of AA1050 sheet. Moreover, the results reveal that ductility of AA1050 alloy has direct relationship with loading temperature, while AA1050 alloy’s strength has inverse relationship with the uniaxial testing temperature. The results were also investigated for the flow stress variation due to the loading direction and testing atmosphere. Laboratory test results suggested optimum parameters for forming part from AA1050-H14 alloy sheets of about 2 mm thickness at elevated temperature.