Testing, modelling and design of 7A04-T6 high-strength aluminium alloy RHS columns under axial compression

Li, Beibei; Wang, Yuanqing; Zhi, Xinhang; Zhang, Ying; Baniotopoulos, Charalampos

doi:10.1016/j.jobe.2022.104910

Cited by 8 publications

(4 citation statements)

References 21 publications

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“…The facesheets were tied to the honeycomb ends for welded specimens. The first local buckling mode obtained from elastic Eigenvalue buckling analysis was taken as the initial local geometric imperfection mode, with amplitude of w 0 = 0.033( f 0.2 / σ cr ) t [ 20 ], where σ cr is the elastic buckling stress of a four-side simple supporting thin plate under uniform compression loads and determined as σ cr = 4 π 2 E /[12(1 − v 2 )( b / t ) 2 ], herein v is the Poisson’s ratio.…”

Section: Numerical Simulationmentioning

confidence: 99%

Out-of-Plane Compression Behaviour of Aluminum Alloy Large-Scale Super-Stub Honeycomb Cellular Structures

et al. 2023

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The out−of−plane compression behaviour of 6061−T6 aluminum alloy super−stub honeycomb cellular structures without and with friction stir welding (FSW) facesheets are presented in this paper. A total of twelve axially compressed experiments on large−scale specimens, six with square hollow section (SHS) cores and six with hexagonal hollow section (HHS) cores, were conducted, with failure modes, ultimate resistances and axial load−end shortening curves analysed. The accuracy of finite element (FE) models was validated in accordance with test results. The numerical data obtained from extensive parametric analyses combined with test data were subsequently used to evaluate the applicability of existing design rules in Chinese, European and American aluminium alloy specifications. The results showed that the three specifications generally yielded very conservative predictions for the out−of−plane compression resistances of SHS and HHS super−stub honeycomb cores without and with FSW facesheets by about 30–37%. Design recommendations on the cross−section effective thickness are finally proposed and shown to provide much more accurate and consistent predictions than current design methods. The research results are beneficial to the application and development of large−scale super−stub honeycomb structures in structural engineering, such as the helicopter landing platforms, the base of fluid and gas tanks and ship decks.

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Section: Numerical Simulationmentioning

confidence: 99%

Out-of-Plane Compression Behaviour of Aluminum Alloy Large-Scale Super-Stub Honeycomb Cellular Structures

et al. 2023

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“…To further study the calculation method for the stability coefficient "ϕ" in the axial compressive load-carrying capacity formula, two calculation formulas are available. Figures [12][13][14][15] show that when the relative slenderness ratio 𝜆𝜆 � < 0 lated from Equation ( 8)), the axial pressure stability coefficient of the a aluminum alloy specimen is significantly lower than that of the sing alloy specimen, and the load-carrying capacity of the assembled Tonly 1.2~1.4 times that of the single L-type specimen. However, when bility coefficient of assembled T-shaped specimens is slightly larger th L-type specimens, and the load-carrying capacity is greater than two t gle L-type specimens.…”

Section: Study On the Formula For Calculating The Stability Coefficie...mentioning

confidence: 99%

“…A large number of studies have been conducted on the stability of aluminum alloy compression rods, including biaxially symmetric sections such as H-sections [1][2][3][4][5][6][7], rectangular sections [1,3,5,[8][9][10][11][12][13][14][15], circular tubes [5,10,[16][17][18], etc., as well as uniaxially symmetric sections such as L-sections [4,19,20], slotted sections [21], T-sections [22], and asymmetric unequal L-sections [23,24]. Compared to biaxially symmetrical sections, uniaxially symmetrical sections and asymmetrical sections have more complex and diverse instability patterns under pressure.…”

Section: Introductionmentioning

confidence: 99%

Study on the Behavior of Assembled T-Shaped Aluminum Alloy Specimens under Axial Compression

Ouyang¹,

Liu

Ying

et al. 2023

Metals

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Assembled T-shaped aluminum alloy components represent a new type of structural member in aluminum alloy structures with broad application prospects. In this study, axial compression tests were carried out on 32 aluminum alloy components, considering parameters such as the cross-sectional type and slenderness ratio of the components, to obtain the ultimate bearing capacity and failure mode of the members. The test results show that, for the equilateral assembled T-shaped aluminum alloy components with obvious strong and weak axes, bending instability was most common, and local buckling of the plate occurred when the slenderness ratio of the component was relatively small. For the unequal T-shaped aluminum alloy structures without an obvious strong or weak axis, torsional buckling instability occurred, accompanied by local deformation of the connecting limbs due to mutual compression. A verified finite element model was also established. Based on this model, a parametric analysis was conducted to study the influence of parameters such as initial defects, slenderness ratio, and cross-sectional type on the axial compressive bearing capacity of the assembled T-shaped aluminum alloy components. The experimental and numerical results were then compared with Chinese and European standards, revealing that the standard calculation methods tend to be unsafe. Finally, the calculation parameters for component defects in Chinese and European standards were revised.

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“…The obtained results were then compared with different design principles. In 2022, Li, Beibei et.al [24] carried out design analysis, numerical modeling, and experimental testing for rectangular hollow section (RHS) columns under axial compression composed of high-strength aluminum alloy 7A04-T6. The outcomes were then contrasted using different design approaches.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the buckling behavior of square hollow columns fabricated from 7A04-T6 aluminum alloy through numerical analysis.

Bashir,

Rong

2024

Preprint

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This research employed ANSYS 17 finite element analysis software to numerically consider the investigation of the buckling behavior of columns made from square hollow sections (SHS) composed of aluminum alloy. A validated modeling with nonlinear finite elements was created through column pin-ended tests. The column samples were manufactured using heat-treated aluminum alloys of 7A04-T6. In the finite element model, geometric and material non-linearities were accounted for. Its accuracy was validated through a comparison of the model's results with experimental conditions. A thorough parametric analysis was carried out to explore the impact of fillet radii, cross-sectional slenderness, meshing size, and member slenderness on the stability of columns. The research juxtaposed experimental and numerical results with design strength parameters from various codes, including Chinese, European, American, and Australian/New Zealand standards. Additionally, alternative design approaches such as the direct strength technique and continuous strength method were considered for comparison. The test results indicated that the Direct Strength Method (DSM), Australian/New Zealand Standard (AUS/NZS), and Continuous Strength Method (CSM) overestimated the actual strength of the columns by 57.73%, 18.34%, and 15.21%, respectively. Conversely, the European, Chinese, and American codes underestimated the strength by 23.60%, 17.40%, and 9%, respectively. Upon examining the numerical data, it was evident that the actual strength of the columns was underestimated by 47.48%, 10.99%, and 7.99% when employing the Direct Strength Method (DSM), Australian/New Zealand Standard (AUS/NZS), and Continuous Strength Method (CSM), respectively. Similarly, the European (EN), Chinese (GB), and American (AA) methods underestimated the strength by 32.80%, 24.30%, and 15.70%, respectively. The majority of existing design guidelines and approaches tend to be conservative in forecasting the ultimate strength of columns made of 7A04-T6 aluminum alloy under eccentric stress. To improve accuracy, a modified formula predicated on the Eurocode was suggested, adjusting various factors for more precise predictions of the ultimate strength of columns made of 7A04-T6 aluminum alloy.

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Testing, modelling and design of 7A04-T6 high-strength aluminium alloy RHS columns under axial compression

Cited by 8 publications

References 21 publications

Out-of-Plane Compression Behaviour of Aluminum Alloy Large-Scale Super-Stub Honeycomb Cellular Structures

Out-of-Plane Compression Behaviour of Aluminum Alloy Large-Scale Super-Stub Honeycomb Cellular Structures

Study on the Behavior of Assembled T-Shaped Aluminum Alloy Specimens under Axial Compression

Investigation of the buckling behavior of square hollow columns fabricated from 7A04-T6 aluminum alloy through numerical analysis.

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