Research On The Mechanical Properties Of 6082-T6 Aluminum Alloy Under Axial Compression And Bending At High Temperatures

Aluminum alloy has the advantages of light weight,high strength,corrosion resistance and good plasticity.It has been widely used at home and abroad.However,due to the low melting point of aluminum alloy,the strength and elastic modulus decrease rapidly at high temperature,so its stability at high temperature can not be effectively guaranteed.In this paper,the axial compression and bias stability of 6082-T6 aluminum alloy column under high temperature are tested and the corresponding numerical simulation studies are carried out.The calculation formulas of axial compression and bias stability under high temperature are proposed,and the fitting formula and Chinese standard are proposed.The Aluminum Structure Design Specification and the European specification Eurocode9 compare the design methods of axial compression and bias stability.The results show that the fitting formula is more reliable and accurate than the Chinese and European regulations,and can provide reference for future engineering practice applications..The specific research contents of the stability properties of aluminum alloy components at high temperature are as follows:(1)Experimental study on axial compression and bending members of aluminum alloy under high temperatureIn this paper,a total of 40 H-section 6082-T6 aluminum alloy members were subjected to high-temperature compression test,including 10 axial compression tests and 30 bias tests.The test set five temperature points,which are 20℃,100℃,200℃,300℃ and 400℃.The bias test specimens are all biased around the strong axis,and the eccentricity is e=10 mm,20 mm and 30 mm.The results of the test show that the axial compression specimens under all temperature conditions have an overall bending instability around the weak axis,and all the biasing members are bent and twisted.(2)Numerical simulation of axial compression and compression-bending members of aluminum alloy under high temperatureThe finite element software ABAQUS was used to create a refined finite element model of aluminum alloy members under high temperature.The results of the experiment were compared with the results of the finite element model.It was found that the finite element model can accurately predict the bearing capacity,deformation and failure modes of the test members.The accuracy of the finite element model was verified.The effects of initial bending,mesh size and end plate thickness on the results of finite element model are analyzed.The results show that the effect of end plate thickness and mesh size on finite element results is negligible.(3)Study on the stability design method of axial compression and compression-bending members of aluminum alloy under high temperatureFor the axial compression members under high temperature,this paper expands the parameter analysis and calculates 765 finite element models of aluminum alloy columns with different cross-section dimensions.The axial compression stability coefficients of aluminum alloy columns at different temperatures are obtained.The results were incorporated into the fitting formula,Chinese norms and European regulations.It was found that the fitting formula can predict the test results more accurately.For the biasing members under high temperature,the calculation formula of bending and torsion stability under high temperature is proposed.The reliability of the calculation formula is verified by expanding the parameter analysis.The test results are brought into the fitting formula,Chinese norms and European regulations for comparison.The calculation of the gauge is conservative,and the calculation result of the fitting formula is more accurate.