Experimental Analysis of the Behaviour of Aluminium Alloy EN 6082AW T6 at High Temperature

Abstract

Abstract:The paper presents test results for the mechanical and creep properties of European aluminium alloy EN 6082AW T6 at high temperatures. Mechanical properties of the aluminium alloy were determined by means of two types of test: constant stress-rate and stationary creep tests. Mechanical properties were determined up to a temperature of 350 • C, while the creep tests were conducted within the temperature interval 150-300 • C. The creep tests conducted identified the critical temperature interval for creep development, which represents an important factor when analysing creep behaviour of aluminium structures. This temperature interval was found to be within the range 200-300 • C. Test results for stress at 0.2% strain and modulus of elasticity at different temperatures showed good agreement with the codified values from Eurocode 9 and with other comparable studies.

Development of a rheological model for creep strain evolution in steel and aluminium at high temperature

“…The creep behaviour of British and European steel grades was previously investigated by Kirby and Preston, Rubert and Schaumann (transient tests on grades S235 and S355), Brnić et al, and Torić et al (stationary tests on grade S275). Creep research on the aluminium alloy series 6xxx, which is used in the construction industry, was extensively investigated by Maljaars et al (alloy 6060‐T66), Langhelle, Eberg et al (alloys 6082 T4 and 6082 T6), and Torić et al (alloy EN6082AW T6). Some research has also been performed on the influence of creep on larger‐scale specimens.…”

“…To present the capabilities of the proposed rheological model, 2 recent creep test studies have been chosen for calibration, since they offer complete stationary creep test results that are presented in a form of a simple analytical formula. These studies refer to creep tests conducted by Torić et al on steel grade S275JR and aluminium grade EN6082AW T6 . Both studies used the same test methodology for determining stationary creep.…”

“…The purpose of both of the studies was to determine material parameters and time‐dependent creep strain values in the temperature ranges 400 to 600°C and 200 to 300°C for steel S275 and aluminium EN6082AW T6, respectively. The test regime consisted of 3 phases in each case: Heating phase with an approximate heating rate of 15°C/min, Soaking period that lasted 60 minutes, and Loading phase in which the stress and temperature levels were held constant. …”

“…The results of the constant stress‐rate tests from Torić et al were used to calibrate the model of spring 1 and to adapt the rheological model to the mechanical properties of aluminium alloy EN6082AW T6. The test values for modulus of elasticity ( E 1 ) and stress at 0.2% strain ( σ 1max ) are presented in Table .…”

“…Comparison between the test results and predictions of the rheological model for stress‐related strain [Colour figure can be viewed at wileyonlinelibrary.com]…”