Influence of the properties of the joining partners on the load-bearing capacity of shear-clinched joints

Wiesenmayer, Sebastian; Graeser, Matthias; Merklein, Marion

doi:10.1016/j.jmatprotec.2020.116696

Cited by 14 publications

(9 citation statements)

References 7 publications

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“…Starting with the residual bottom thickness t b , there are minor differences when comparing the material combinations N0/N1, N0/N3 and N0/4 and only a slightly higher value for the N0/N2 joint. Since the radial material flow during the process is dependent on the strength of the joining partners, 23 the value is rather consistent because of the unchanging punch-sided material in this investigation. Additionally, the differences in strength for the die-sided material are not distinctive enough for an effect on t b .…”

Section: Resultssupporting

confidence: 59%

“…22 Another general observation is that the punch-sided AA6014-T4 shows no failure in the upper and lower neck region, which was also found for the relatively similar AA6111-T4 alloy in previous investigations and can be explained with the sufficient high ductility. 23 Furthermore, the joints display a symmetrical geometry relatively to the radial flow direction of the material, which can be seen as a boundary condition for a successful shear-clinched joint with respect to its later isotropic behaviour under load.…”

Section: Resultsmentioning

confidence: 99%

“…As previous investigations showed, for materials with higher ductility higher cutting strokes are necessary, due to the increased bending and rollover of the material before the cut. 23 When analysing the dependency of the maximum process force F J from the number of ARB cycles, it is apparent that the highest forces are present for the N0/ N4 material pairing. This can be explained by the highest strength of the 16-layered material, resulting in the fact that it requires a higher force to upset the die-sided slug.…”

Section: Analysis Of the Process And The Joint Geometrymentioning

confidence: 99%

See 2 more Smart Citations

Investigation of the joinability of single- and multi-layered AA6014 sheets produced by accumulative roll bonding in the shear-clinching process

Zettl

Wiesenmayer

Kraus

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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Accumulative roll bonding belongs to the severe plastic deformation processes and is suitable for producing multi-layered as well as high-strength sheets through repeated rolling. After four accumulative roll bonding-cycles, the strength of the investigated AA6014-T4 alloy is elevated due to strain and fine grain hardening by 170% in yield strength and by 37% in ultimate tensile strength. This is accompanied by a significant decrease in material ductility which is disadvantageous for joining processes based on forming operations. Shear-clinching, however, can be used to join high-strength and low-ductile materials on the die side. Thus, it is a promising method for the mechanical joining of accumulative roll bonding components. The multi-layered and more brittle material is located on the die side whereas the single-layered base material with higher ductility is positioned on the punch side. At present, there is no scientific knowledge how the multi-layered material behaves in the shear-clinching process. Since the material is cut in the process, delamination effects could occur at the interfaces produced via accumulative roll bonding. Additionally, the investigation aims at the influence of the accumulative roll bonding process on the properties of the joints. They are expected to depend on the number of process cycles and thus on the change of mechanical properties of the multi-layered material. The bond strength of the shear-clinched joints is determined by shear and tensile tests. The areas of material failure are analysed via metallographic methods. From the failure behaviour and load-bearing capacity it is determined which number of accumulative roll bonding cycles is ideal for joining multi-layered sheets via shear-clinching.

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Section: Resultssupporting

confidence: 59%

Section: Resultsmentioning

confidence: 99%

Section: Analysis Of the Process And The Joint Geometrymentioning

confidence: 99%

See 1 more Smart Citation

Investigation of the joinability of single- and multi-layered AA6014 sheets produced by accumulative roll bonding in the shear-clinching process

Zettl

Wiesenmayer

Kraus

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

Self Cite

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“…Therefore, less material flows from the upper neck into the lower neck area, leading to high tensile stresses in the lower neck area during the drawing phase. 27 For PB, the penetration by the outer punch Δs OP is slightly higher than for T4, even though the flow stresses are higher for the PB condition. In addition, both states show a similar anisotropic behavior (Table 1).…”

Section: Resultsmentioning

confidence: 86%

Investigation of the joinability of the high-strength aluminum alloy AA7075 in shear-clinching processes

Wiesenmayer

Merklein

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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Shear-clinching has proven to be a suitable technology for joining of high-strength materials. However, the mechanical properties of the upper joining partner are limited due to the high strains, which occur during the process. Therefore, shear-clinching of the high-strength aluminum alloy AA7075 in the T6 temper is not possible. Yet, the mechanical properties of hardenable alloys of the 7000 series can be influenced by a heat treatment. Thus, within the scope of this work, the joinability of the high-strength alloy AA7075 in shear-clinching processes in dependance of its temper is investigated. The as fabricated state F, the artificially aged T6 temper, a paint baked state and the naturally aged T4 temper are compared to the fully solution annealed W temper as well as to a retrogression heat-treated state. For retrogression heat treatment, a laser is used as heat source, heating up the alloy for a short term in order to only partially dissolve precipitations. The resulting mechanical properties are determined with uniaxial tensile tests. Moreover, the influence of the mechanical properties of AA7075 on the shear-clinching process, the joint formation and the resulting joint strength is analyzed.

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“…In brief, except for the four types of dies mentioned above, some novel techniques have been innovated and developed by many scholars, such as hole-clinching, [31][32][33] shear clinching, [34][35][36] and laser shock hole-clinching. 37,38 Meanwhile, the reshaping method is also proposed to enhance the strength of clinched joints.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of Al5052‐H32/PETG hybrid clinched joints

Ouyang

Chen

Ren

et al. 2022

J of Applied Polymer Sci

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The mechanical clinching technique with an extensible die is selected to connect the metal‐polymer hybrid structure in this article. Al5052‐H32 is chosen as the metallic material. Polyethylene terephthalate glycol (PETG) was chosen as the polymer material. The connection between Al5052‐H32 and PETG is accomplished under diverse forming forces. To evaluate the joinability of hybrid joints, the dimension parameters of hybrid joints are measured by inspecting the transverse section of clinched joints. To evaluate the reliability of joints, the tensile shear test and the energy absorption calculation are accomplished. Moreover, the effect of various forming forces on the mechanical characteristics and failure mode of the hybrid structure is analyzed. The results showed that the Al5052‐H32 sheet and PETG sheet could be effectively connected. The optimal forming force is 38 kN in this experiment. Under this condition, the maximum tensile shear load and the maximum energy absorption value are 1520.16 N and 4.69 J, respectively.

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Influence of the properties of the joining partners on the load-bearing capacity of shear-clinched joints

Cited by 14 publications

References 7 publications

Investigation of the joinability of single- and multi-layered AA6014 sheets produced by accumulative roll bonding in the shear-clinching process

Investigation of the joinability of single- and multi-layered AA6014 sheets produced by accumulative roll bonding in the shear-clinching process

Investigation of the joinability of the high-strength aluminum alloy AA7075 in shear-clinching processes

Experimental investigation of Al5052‐H32/PETG hybrid clinched joints

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