Enhancement of the tensile shear strength for joining low-ductility aluminium to high-strength steel by using electrically-assisted mechanical clinching (EAMC)

Proceedings of the Institution of Mechanical Engineers, Part B:

Peng

et al. 2022

The advantages of well-distributed material flow, easy demolding, and good mechanical interlock structure of the extensible die provide the possibility to be widely used in joining lightweight components. In order to explore the differences in the mechanical properties of the joints produced by different dies, the mechanical behavior of the clinched joints made by the fixed die and extensible dies of 2, 3, and 4 movable segments was investigated in the present study. The process of forming evolution, geometric characterization, failure mode, static strength, joint stiffness, and energy absorption of the dissimilar joints were studied by experimental method. In the clinching process, the neck thickness of joints made by extensible dies can be enlarged by the sliding outward of the movable segments compared with those produced by fixed dies. The failure mode of all clinched joints in this paper is neck fracture. The clinched joints produced by extensible dies of 3 movable segments have the highest static strength in both static tensile and shear tests among the dissimilar joints, which values are 1239.41 and 1259.80 N, respectively. Shearing strength of the joints performed by the extensible dies with 2, 3, and 4 movable segments was increased by 9.84%, 10.09%, and 9.40%, and the tensile strength of those clinched joints was increased by 16.27%, 20.31%, and 14.34% than that of the joints produced by the fixed dies. Experimental have proved that the number of movable segments on the extensible dies has a limited effect on the joint stiffness, tensile strength, and energy absorption of the clinched joints in the cross-lap-tensile test, while it has great effect on the stiffness and energy absorption of the clinched joints in the single-lap-shear test.

Section: Failure Modementioning

confidence: 70%

“…If the thinnest region of the joint neck is fractured, the failure mode is referred to neck fracture failure mode. 31,51,52…”

Section: Results For Profile and Static Tests Of Jointsmentioning

confidence: 99%

Investigation on mechanical behavior of clinched joints produced with dissimilar dies

Ren

Proceedings of the Institution of Mechanical Engineers, Part B:

Peng

et al. 2022

“…The use of galvanized coating steel could effectively reduce the corrosion of steel-aluminium joints, improving the performance of the joints [21]. Barimani-Varandi et al [22,23] applied electrically assisted mechanical clinching to join AA6061-T6 and galvanized DP590 steel. Electrically assisted preheating was used to improve the connection of low plasticity aluminium alloy to high-strength steel.…”

Section: Introductionmentioning

confidence: 99%

Research on the mechanical clinching process for the metal–polymer multilayer structure

Ouyang

Materials Science and Technology

2023

With the wide application of lightweight materials, the metal–polymer multilayer structure has become a research focus owing to the advantages of lower weight and higher vibration damping. In the current work, the mechanical clinching process of the metal–polymer multilayer structure between Al5052-H32 and polyoxymethylene was investigated. The effect of diverse plate configurations and different test specimen forms on the mechanical characteristics was analysed in terms of geometric parameters, static strength, failure modes and energy absorption. The results showed that the metal–polymer multilayer structure could be successfully connected utilizing the mechanical clinching process. The cross-tension load and lap-shear load of the joint were greatly affected by the plate configuration as well as the test specimen form.

“…18–25 The hybrid clinching that combines a variety of joining methods, such as bond-clinching, ultrasound-assisted clinching, laser-assisted clinching, rivet-clinching, has been extensively researched, expanding the application field of mechanical clinching. 26–30 However, most of the existing clinching processes employed round punches. And the round joint cannot withstand the torsion force like the rectangular or the square joint when the joint exists alone.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the mechanical square clinching process for joining Al5052 sheets

Gao

Proceedings of the Institution of Mechanical Engineers, Part B:

Ren

et al. 2022

Clinching technology has been extensively applied as a green and clean joining method, which has the benefits of less energy consumption, no pollution and no noise. However, a single joint produced by round tools cannot withstand the torsion force. In order to solve this problem, a square clinching technology was proposed and investigated in this paper. The main geometric parameters, failure mode, static strength, and energy absorption of the square clinched joint were studied. The fracture characteristics of square clinched joints under different mechanical experiments were studied by a scanning electron microscope. The strength tests of Al5052 clinched joints under various forming forces were carried out. The results showed that the neck fracture mode was the only failure mode observed during the failure process. The microscopic morphology of the joint fracture shows typical ductile fracture characteristics. It turned out that the square clinching process can effectively join aluminum alloy sheets.