Study on Axial Compression Performance of H-Type Bending-Torsion Aluminum Alloy Member Without Ribs
In order to study the axial compression of H-shaped bending-torsion aluminum alloy members,an axial compression test was carried out on an H-shaped flexural-torsional aluminum alloy member,which was obtained by sweeping and twisting the H-shaped section around a section of arc.The cross section design size is H350×200×10×12,the bending arc radius is 2850 mm,the span is 2936 mm,the torsion angle is 26°,the material is 6061-T6 aluminum alloy profile,and the boundary condition is hinged at both ends.Firstly,in order to obtain the accurate geometric model of H-type bending and torsion aluminum alloy member,the whole component is scanned in three dimensions,and the cloud point data of the outer surface of the component are obtained.By comparing the cloud point data with the ideal geometric model,it is found that most of the overall geometric deviation is controlled within 3 mm,and the thickness and width of the upper flange of the component are less than the ideal geometric model to varying degrees.Then,the load-displacement curve,load-strain curve and failure mode of the component are obtained through the axial compression test.The ultimate bearing capacity of the H-type bending-torsion aluminum alloy member is 313 kN,and finally the lower flange of the member and the web near the lower flange appear serious buckling deformation.Finally,the accurate geometric model of the component is obtained according to the inverse processing of the three-dimensional scanning data.On this basis,the finite element model is established by ABAQUS.The stress development and failure mechanism of the component are obtained by numerical analysis.The failure mode,load-displacement curve and load-strain curve of the aluminum alloy component are in good agreement with the test,which verifies the reliability of the finite element simulation.Before reaching the ultimate bearing capacity,the lower flange and web of the component are subjected to large-scale compression and yield into plasticity,and the failure mode of the component is flexural-torsional buckling failure.
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