Macroscopic modeling of thin-walled aluminum-steel connections by flow drill screws

Graf, Marius; Sikora, Sebastian P.; Roider, Carmen S.

doi:10.1016/j.tws.2018.02.023

Cited by 15 publications

(7 citation statements)

References 9 publications

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“…Aluminum alloy 3003 (AA 3003) sheets with dimensions of 5 × 20 × 1.5 mm 3 and austenitic stainless steel (AISI 304) sheets with dimensions of 40 × 20 × 1.5 mm 3 were used as base materials. The AlSi10 filler metal (AA 4045) was applied as a paste.…”

Section: Methodsmentioning

confidence: 99%

“…To produce a high-quality joint between aluminum alloys and steels, several joining processes have been investigated [2]. For example, conventional mechanical fastening processes like self-piercing riveting and flow drill screwing are limited when the materials to be joined have high strength and low ductility [3,4]. The novel mechanical fastening processes using nonconventional fasteners show high strength and corrosion resistance and low thermal expansion.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Thickness of the Reaction Zone in Aluminum/Stainless Steel Brazed Joints on the Mechanical Properties

Fedorov

Uhlig

Wagner

2021

Metals

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The study deals with the characterization of the relationship between the microstructure of the reaction zone and the mechanical properties in the brazed joints of aluminum alloy 3003 and stainless steel AISI 304 in order to determine the influence of the intermetallic layers on the tensile shear strength of the joints. The joints were produced by induction brazing using an AlSi10 filler in an argon atmosphere at a temperature of 600 °C. Due to the local heat input into the liquid brazing filler during a short brazing time, a thin reaction zone is formed in the brazed joints (~1 µm), which ensures good mechanical properties of the joints. In order to observe the growth kinetics of the reaction zone in the brazed joints and to investigate the influence of the thickness of the reaction zone on the mechanical properties of the brazed joints, the joints were aged at temperatures of 200 °C and 500 °C for 6, 48 and 120 h. The results have shown that the thickness of this layer increases to a maximum of 2 µm depending on the duration of the thermal aging at a temperature of 200 °C. The results of the tensile shear strength tests have shown that the brazed joints with this thin layer ensure a high strength. The thermal aging at a temperature of 500 °C influences the growth of the reaction zone in the brazed joints significantly. The total thickness of the reaction zone increases to a maximum of 12 µm during the thermal aging. The results of the tensile shear tests of these joints have shown that the thermal aging at a higher temperature leads to a decrease of the tensile shear strength of the brazed joints to 67% due to the growth of the existing intermetallic layer and the formation of a new intermetallic layer in the reaction zone.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of the Thickness of the Reaction Zone in Aluminum/Stainless Steel Brazed Joints on the Mechanical Properties

Fedorov

Uhlig

Wagner

2021

Metals

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“…The lowest values of ρ are essentially pinned connections, whereas values > 10 correspond to rigid connections. It should be mentioned that a more detailed model for connection flexibility can be determined using, for example, [10], but at the expense of increased computational effort.…”

Section: Parametric Studies Of the Initial Structurementioning

confidence: 99%

Design considerations for photovoltaic panel arrays made from aluminium: a case study

2019

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This paper presents the design considerations for typical photovoltaic panel arrays having aluminium members. Section and member design checks are performed according to Eurocode 9 on the basis of the wind, snow and seismic loads of Eurocodes 1 and 8. Improvements to the design are then sought, starting by reducing the distance between the vertical posts and then by changing the thickness of specific sections. Following that, the effects of member imperfections and connection flexibility are studied using a reduced flexural rigidity and different rotational stiffness values respectively. The degree of dynamic coupling when the array is placed on the top floor of an existing building as well as the influence of founding the vertical posts on compliant ground are also evaluated.

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“…Flowdrill technology can create a hole and form a joint in a single operation, and we anticipate that under the proper conditions, it will form a joint without a fastener. Flowdrill technology is a chipless technology contributing to environmental protection and material saving [9][10][11][12][13][14][15][16]. The drill tool is pushed into the material using relatively high axial pressure and rotational speed (approximately 2000-2500 min −1 ); the resulting heat (600-800 °C) causes the material to soften, and, subsequently, the tool to penetrate [17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Joining of Dissimilar Thin Metallic Sheets—Mechanical Joining and Adhesive Bonding

Guzanová,

Draganovská,

Brezinová

et al. 2024

Crystals

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This paper deals with joining dissimilar materials using thermal drilling technology as well as the combination of thermal drilling and adhesive bonding. The base materials for the experimental work were deep-drawn low-carbon steel DC04, HSLA steel TL 1550-220 + Z, and structural aluminum alloy EN AW-6082 T6 (AlSi1MgMn). The geometry of the formed joints was tested metallographically as the load-bearing shear capacity under the tensile shear test of single-lapped joints and the resistance of the joints against corrosion-induced disbonding in a climate chamber. The energy dissipated by the joints up to fracture was calculated from the load–displacement curves. The hybrid joints were compared with the bonded joints with the same overlap area in terms of the load-bearing capacity and energy dissipated at joint failure. The hybrid joints formed by thermal drilling and adhesive bonding with a rubber-based adhesive confirmed the synergistic effect—the adhesive provides the high load-bearing capacity of the joint, and the bushing formed by thermal drilling increases the dissipated energy of the joint at failure. The exposure of the joints in the climatic chamber did not cause a relevant reduction in the characteristics of the joints.

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Macroscopic modeling of thin-walled aluminum-steel connections by flow drill screws

Cited by 15 publications

References 9 publications

Influence of the Thickness of the Reaction Zone in Aluminum/Stainless Steel Brazed Joints on the Mechanical Properties

Influence of the Thickness of the Reaction Zone in Aluminum/Stainless Steel Brazed Joints on the Mechanical Properties

Design considerations for photovoltaic panel arrays made from aluminium: a case study

Hybrid Joining of Dissimilar Thin Metallic Sheets—Mechanical Joining and Adhesive Bonding

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