Study of local buckling performance of 7075-T6 high-strength aluminium alloy H-section stub columns

Zhi, Xinhang; Wang, Yuanqing; Zhang, Ying; Li, Beibei; Ouyang, Yuanwen

doi:10.1016/j.tws.2022.109925

Cited by 20 publications

(15 citation statements)

References 19 publications

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“…In a set of 16 coupon tests executed by Zhi et al [6], they extracted samples from the flange and web of the section made from 7075-T6. The tests were conducted over four distinct nominal thicknesses (4, 5, 6, and 8 mm), with each thickness undergoing four individual tests.…”

Section: Materials Propertiesmentioning

confidence: 99%

“…Because the consideration of strain hardening was omitted, the stress-strain curve utilized in FE models was rendered easier and characterised as bilinear. The numerical model used the material parameters deduced from the coupon testing outcomes [6,7]. An effective stress-strain profile was obtained by converting the engineering material plot following specified formulas outlined in the manual [29].…”

Section: Materials Propertiesmentioning

confidence: 99%

“…Lately, there has been a notable adoption of two varieties of C-shaped components produced through extrusion. These components employ high-strength aluminium alloys, namely AA-6086 and 7075-T6 [6,7], known for their increased yield strength and reduced expenses. The focus of this investigation was on the high-performance aluminium materials 7075-T6 and AA-6086.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Modelling and Proposed Design Rules of 7075-T6 and AA-6086 High-Strength Aluminium Alloy Channels under Concentrated Loading

Fu,

Sun,

Sun

2023

Buildings

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This study presents a detailed numerical investigation into the web buckling behaviour exhibited by high-strength aluminium alloy channels, namely 7075-T6 and AA-6086, when subjected to concentrated loading. A nonlinear finite element (FE) model was established and verified using the experimental data reported by other researchers, and the material properties of 7075-T6 and AA-6086 high-strength aluminium alloy were obtained through the literature. A parametric study comprising 1024 models was performed using the validated FE models. Variables examined in this work included web slenderness ratio, internal corner radii, bearing lengths, and aluminium alloy grades. The numerical results generated by the parametric investigation were used to evaluate the applicability and reliability of the most recent design specifications given in the Australian and New Zealand Standards (AS/NZ S4600) (2018) and Australian Standards (AS/NZS 1664.1) (1997). The comparison indicated that the calculated design strength using AS/NZ S4600 was over-conservative by 41% and 43% for 7075-T6 and AA-6086 aluminium alloy, correspondingly, while the design strength computed using AS/NZS 1664.1 was marginally unconservative, compared to numerical results. Finally, using bivariate linear regression analysis, new design formulas with new coefficients for determining the web buckling behaviour of 7075-T6 and AA-6086 high-strength aluminium alloy channels were proposed. A reliability analysis was then undertaken, indicating that the proposed design equations possess the capability of accurately predicting the web buckling behaviour of these members.

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Section: Materials Propertiesmentioning

confidence: 99%

Section: Materials Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Modelling and Proposed Design Rules of 7075-T6 and AA-6086 High-Strength Aluminium Alloy Channels under Concentrated Loading

Fu,

Sun,

Sun

2023

Buildings

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“…Aluminum alloys are widely used because of their light weight [ 1 ], high specific strength [ 2 ], high ductility [ 3 ], corrosion resistance, low price, and excellent manufacturability [ 4 ]. However, nonmetallic inclusions may be introduced from the raw materials used in the extractive metallurgical processes, from the refractory materials and the atmosphere during aluminum production, and even from the refining processes [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

A New Strategy on Designing Fluxes for Aluminum Alloy Melt Refinement

Zhang

et al. 2023

Materials

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With the aim of obtaining a refining flux that is stable and provides effective refining of aluminum melt, a new strategy of designing the flux composition has been proposed. Ten fluxes were designed, by selecting ten molten salt compounds according to their thermophysical parameters, physical properties, and thermodynamic analysis. The melting points of the ten fluxes, and the phases transformation of the fluxes after melting, were studied by DSC and XRD, respectively. The contact angles between four groups of fluxes and alumina at refinement temperatures were studied, and the effect of refinement was characterized by a metallographic microscope. The process of the fluxes removing inclusions and degassing was analyzed thermodynamically. The research findings indicate that flux #10 (11.0 wt.%NaF, 29.5 wt.%NaCl, 46.5 wt.%Na2CO3, 3.0 wt.%CaF2, 10.0 wt.%Na3AlF6) has a melting point (562.2 °C) below the refining temperature. At the refining temperature (760 °C), flux #10 has the lowest contact angle, of 12.78°. In addition, compared to that of flux STJ–A3, currently used in practice, flux #10 has a better refining effectiveness, with the pores and inclusions content of the sample being reduced to 1.11% from 2.96%.

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“…Therefore, aluminum alloy large-scale honeycomb structures have great application potential in helicopter landing platforms, the base of fluid and gas tanks, ship decks, etc. Many researchers studied the local buckling behaviour and axial compression resistances of stub columns with large sizes, including the AA6060 aluminum alloy square hollow sections (SHS) [ 9 ], 6060-T6, 6082-T6 and 6061-T6 aluminum alloy SHS and rectangular hollow sections (RHS) [ 10 ], 6063-T5 and 6061-T6 aluminum alloy circular hollow sections (CHS) [ 11 ], 6061-T6 and 6063-T5 aluminum alloy SHS and RHS with internal cross stiffeners [ 12 ], 6061-T6 and 6063-T5 aluminum alloy H sections [ 13 ], 7A04-T6 aluminum alloy SHS and RHS [ 14 ] and 7075-T6 aluminum alloy H sections [ 15 ]. However, existing studies mainly focused on the axial compression behaviour of aluminum alloy stub columns with single RHS, SHS, CHS and H sections and the height of three times the depth of their sections, and few investigations on the out-of-plane compression behaviour of aluminum alloy large-scale super-stub honeycomb cores are reported, which imposes a great restriction on the application and development of large-scale super-stub honeycomb structures in structural engineering.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2023

Self Cite

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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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Study of local buckling performance of 7075-T6 high-strength aluminium alloy H-section stub columns

Cited by 20 publications

References 19 publications

Numerical Modelling and Proposed Design Rules of 7075-T6 and AA-6086 High-Strength Aluminium Alloy Channels under Concentrated Loading

Numerical Modelling and Proposed Design Rules of 7075-T6 and AA-6086 High-Strength Aluminium Alloy Channels under Concentrated Loading

A New Strategy on Designing Fluxes for Aluminum Alloy Melt Refinement

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

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