Abstract
Aluminum alloy sheets are gaining increasing interest in the construction of some or all components of the car body in view of their lightweight properties which can allow significant fuel consumption reduction. In order to be suitable for car body application, aluminum alloy sheets should have sufficient mechanical properties both in static (e.g., structural stability and durability) and dynamic conditions (e.g., crash test). Static and dynamic mechanical tests (strain rates: ε ˙ ≈ 1 × 10−3 s−1 and ε ˙ ≈ 5 × 102 s−1 respectively) were conducted on AA6016 alloy sheet (1 mm thick), in T4 and T6 temper and for the longitudinal, transverse, and diagonal rolling directions by means of standard static tensile test and modified Hopkinson bar dynamic tests. Microstructural and fracture morphology observations are also reported. The results show that the ultimate tensile strength increases by 13−14%, and the elongation at fracture increases by 75−105%, depending on the temper, by increasing the strain rate.
Highlights
Materials and MethodsSamples of a sheet of the AA6016 alloy, 1 mm thick, supplied in the T4 state (solution heat treated, quenched, and natural aged) were analyzed with optical emission spectroscopy (OES) to detect the chemical composition
The dynamic tests were conducted with a modified Hopkinson bar (MHB) device, which requires a sample with 10 mm gauge length and 4 mm minimum width (Figure 2)
The mechanical behavior of the AA6016 aluminum alloy was characterized in the T4 and T6 temper and under static and dynamic load
Summary
Samples of a sheet of the AA6016 alloy, 1 mm thick, supplied in the T4 state (solution heat treated, quenched, and natural aged) were analyzed with optical emission spectroscopy (OES) to detect the chemical composition. These samples are flat with the following dimensions: 10 mm gauge length, 10 mm calibrated length, 5 mm width, 1 mm thickness (small specimen) The choice of these two different dimensions was done to determine the influence of size effects on the tensile results. The dynamic tests were conducted with a modified Hopkinson bar (MHB) device (custom made), which requires a sample with 10 mm gauge length and 4 mm minimum width (Figure 2). These specimens were taken from sheet positions next to those of the static tests, and had the same thickness. The parameters were optimized for the two approximation models and were combined with a weighting factor α of 0.7
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