Abstract
The thermo-mechanical behaviour in tension of an as-cast and homogenized AA6060 alloy was investigated at a wide range of strains (the entire deformation process up to fracture), strain rates (0.01–750 s −1 ) and temperatures (20–350 ∘ C ). The tests at strain rates up to 1 s −1 were performed in a universal testing machine, while a split-Hopkinson tension bar (SHTB) system was used for strain rates from 350 to 750 s −1 . The samples were heated with an induction-based heating system. A typical feature of aluminium alloys at high temperatures is that necking occurs at a rather early stage of the deformation process. In order to determine the true stress-strain curve also after the onset of necking, all tests were instrumented with a digital camera. The experimental tests reveal that the AA6060 material has negligible strain-rate sensitivity (SRS) for temperatures lower than 200 ∘ C , while both yielding and work hardening exhibit a strong positive SRS at higher temperatures. The coupled strain-rate and temperature sensitivity is challenging to capture with most existing constitutive models. The paper presents an outline of a new semi-physical model that expresses the flow stress in terms of plastic strain, plastic strain rate and temperature. The parameters of the model were determined from the tests, and the stress-strain curves from the tests were compared with the predictions of the model. Good agreement was obtained over the entire strain rate and temperature range.
Highlights
This paper presents results from uniaxial tension tests on an AA6060 alloy at a wide range of strain rates and temperatures
This paper presented a series of thermo-mechanical tension tests on two slightly different AA6060 alloys
A universal testing machine was used at low to medium strain rates, while a split-Hopkinson tension bar system was employed at the dynamic strain rates
Summary
Aluminium alloys in the AA6xxx series are often used for extruded profiles and rolled sheets or plates Such components occur frequently in fields of engineering where lightweight designs are required, for instance safety parts in vehicles and different protective structures. A more comprehensive presentation of the dynamic test rig allowing for different temperatures, the uniaxial test results and the material model is provided in three articles by Vilamosa et al [1,2,3]. This investigation involves the two aluminium alloys Al0.5Mg-0.45Si and Al-0.45Mg-0.4Si. This investigation involves the two aluminium alloys Al0.5Mg-0.45Si and Al-0.45Mg-0.4Si Both are within the window of the AA6060 alloy. It was checked that the materials are isotropic [2]
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