Fast joining of aluminum sheets with Glass Fiber Reinforced Polymer (GFRP) by mechanical clinching

Lambiase, F.; Durante, Massimo; Ilio, A. Di

doi:10.1016/j.jmatprotec.2016.04.030

Cited by 99 publications

(54 citation statements)

References 20 publications

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“…The mechanical clinching technology can also join different materials together. Lambiase et al researched the mechanical joining of aluminum sheets with carbon fiber reinforced polymer sheets and glass fiber reinforced polymer [28,29]. The mechanical clinching technology can join metal sheets with the polymer sheet together [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Restored Joint for Aluminum Alloy

Chen

Zhang

Peng

et al. 2020

Metals

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In recent years, the mechanical clinching method plays an increasingly important role in the building of thin-walled structures. The clinched joint can be employed to join the lightweight materials. Compared with other joining methods, the clinched joint has better mechanical behavior. However, the clinched joint may be deformed during use when it bears a high shear force. In this research, a process to join aluminum alloy and restore deformed joint was proposed and investigated. The clinched joint was deformed in the deforming process. Then, a customized rivet and two flat restoring tools were utilized for restoring the deformed joint to join aluminum alloy. Different restoring forces such as 45, 40, 35, 30, 25, and 20 kN were employed to produce diverse restored joints. Some shearing tests on the restored joint were utilized for understanding joint material flow, mode of failure, thickness of neck, shear strength, and absorption of energy. The thickness of neck can be increased in restoring process, which contributes to improve the shear strength. The rivet embedded in a pit also helps restored joint bear shear force, so all of the restored joints have higher absorption of energy and shear strength than the clinched joints. The restoring process effectively restores the deformed joint to obtain better mechanical behavior.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Restored Joint for Aluminum Alloy

Chen

Zhang

Peng

et al. 2020

Metals

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“…Especially, the mechanical fixing techniques, such as the fixing by the bolts and nuts, have advantages in that intermetallics are not produced and the assembling process can be simplified by the automation. Beside the fixing by the bolts and nuts, recent studies have developed the mechanical clinching and the riveting in order to achieve fast joining (Lambiase, 2015;Chen et al, 2016;Lambiase et al, 2016;Atia and Jain, 2017;Hirsch et al, 2017;Lambiase and Ilio, 2018;Ma et al, 2018). Also the mechanical clinching and the riveting require the proper clamping force.…”

Section: Introductionmentioning

confidence: 99%

Estimation method of interfacial stiffness of bolted joint in multi-material structure by inverse analysis

Kishimoto

Kobayashi

Ohtsuka

et al. 2019

Mechanical Engineering Journal

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Multi-material structure is expected to be the main scheme to construct automobiles. Many methods have been studied to properly fix or bond dissimilar materials. The fixing by the bolts and nuts is one of the primary fixing methods, and has the advantage of easy assembly and disassembly. The interfacial stiffness of the bolted joints is lower than the stiffness of the base materials and varied by the clamping force of the bolts and nuts, because the micro asperities formed on the interfaces just contact each other. The contact analysis by using the surface profile of the interfaces in microscale is one of the accurate estimations. However, the estimation method of the interfacial stiffness in macroscale is also necessary for the in-situ evaluation. This study has developed an estimation method of the interfacial stiffness by the inverse analysis of the clamping force and the natural frequency of the structure. The inverse analysis algorithm introduces the mathematical model of the interfaces in which the contact of the surfaces is assumed to be the contact of the elastic asperities whose peak heights obey the Gaussian distribution. The hammering test was conducted by using the specimen which consisted of the steel plate and the aluminum alloy plate joined by the bolts and nuts. Moreover, as the contact analysis, the finite element method simulated the contact of the asperities formed on the interfaces by using the surface profile of the interfaces. The results showed that the proposed method could estimate the interfacial stiffness which reproduced the natural frequency of the specimen subjected to the clamping force of the bolts and nuts. The interfacial stiffness estimated by the proposed method was comparable to that calculated by the contact analysis.

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“…In recent years, the fixing by screws and bolts is one of the primary fixing methods to construct multi-material structures, and the fixing state such as the interfacial stiffness at the clamped part is required to be evaluated for the proper fixing (Catalanotti et al, 2011;Anami, 2016;Lambiase et al, 2016;Hirsch et al, 2017). One of the simple techniques is the hammering test in which the loosened screw or bolt is detected by the change of the vibration after hammering the target.…”

Section: Introductionmentioning

confidence: 99%

Limitation of estimation method of surface texture parameters by inverse analysis of hammering test data with disturbance

Kishimoto

Kobayashi

Ohtsuka

et al. 2019

Mechanical Engineering Journal

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The surface texture formed by the micro asperities on the surface of the solid members induces the stiffness reduction of the structure constructed by screws and bolts. In recent years, the fixing by screws and bolts is one of the primary fixing methods to construct multi-material structures, and the fixing state such as the interfacial stiffness at the clamped part is required to be evaluated for the proper fixing. The interfacial stiffness affects the total stiffness of the structure and is dominated by the surface texture and the clamping force. Especially, the standard deviation of the asperity peak heights and the homogenized elastic modulus collectively named as the surface texture parameters mainly determine the interfacial stiffness. This study has developed an estimation method of the surface texture parameters by the inverse analysis of the hammering test data, and numerically investigated the basic behavior and the estimation error of the inverse analysis for the establishment of the methodology to find the limitation of the proposed method against the disturbance in the hammering test data. In the investigation, a theoretical limitation of the inverse analysis has been derived by the linear approximation, and a numerical simulation which is the same approach as the Monte Carlo simulation has been performed by using a bolted joint model consisting of two plates joined by the eight sets of the bolt and nut. From the results of the numerical simulation, the followings were summarized: 1) The recalculation error of the natural frequency subjected to the clamping force is as large as the disturbance in the hammering test data. 2) The sensitivity of the homogenized elastic modulus is much smaller than that of the standard deviation of the asperity peak heights in the inverse analysis. 3) The theoretical limitation of the linear approximation can qualitatively predict the estimation errors of the surface texture parameters.

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Fast joining of aluminum sheets with Glass Fiber Reinforced Polymer (GFRP) by mechanical clinching

Cited by 99 publications

References 20 publications

Investigation of the Restored Joint for Aluminum Alloy

Investigation of the Restored Joint for Aluminum Alloy

Estimation method of interfacial stiffness of bolted joint in multi-material structure by inverse analysis

Limitation of estimation method of surface texture parameters by inverse analysis of hammering test data with disturbance

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