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

Abstract The suitability of mechanical clinching (press joining) to join fiber-reinforced plastics with aluminum sheets was investigated. To this end, different types of tools were tested, including split, grooved, flat dies, as well as rectangular ones. The influence of sheet thickness (thin sheets of 2 and 3 mm in thickness) and alloy composition (AA6082-T6 and AA5086) on joinability and mechanical behavior of the joints was analyzed. Single lap shear tests were conducted to characterize the joints, and fracture produced after joining and testing was performed. In addition, the geometry evolution of the joints during clinch joining was studied to understand the material flow and damage evolution of both aluminum and Glass Fiber Reinforced Polymer (GFRP) sheets. The study demonstrates the feasibility of the process, which has great potential for shortening the joining time dramatically as compared to conventional processes (riveting, adhesive bonding). According to the achieved results, round grooved tools are not suitable for this purpose since the formation of GFRP crumbles, which fills the die cavity, thus requiring a long restoration time. On the other hand, the other types of tool enabled joining aluminum with the GFRP sheets successfully. Such joints fractured in the aluminum bulge or in the GFRP sheet by bearing failure; in both the cases, the failure modes developed progressively rather catastrophically. The best performance was achieved by the joints produced by the split die. Such joints were also characterized by limited composite damage in the joint’s neighbors, since the damaged composite material was separated from the joint.

[1]  Reimund Neugebauer,et al.  Advances in mechanical joining of magnesium , 2008 .

[2]  A. Di Ilio,et al.  Mechanical clinching of metal–polymer joints , 2015 .

[3]  Byung-Min Kim,et al.  Influence of Tool Shape on Hole Clinching for Carbon Fiber-Reinforced Plastic and SPRC440 , 2014 .

[4]  A. S. Bouchikhi,et al.  Effect of mixed adhesive joints and tapered plate on stresses in retrofitted beams bonded with a fiber-reinforced polymer plate , 2013 .

[5]  Meftah Hrairi,et al.  Clinching process for joining dissimilar materials: state of the art , 2016 .

[6]  Shengdun Zhao,et al.  Experimental and numerical research for the failure behavior of the clinched joint using modified Rousselier model , 2014 .

[7]  Francesco Lambiase,et al.  Mechanical behaviour of polymer–metal hybrid joints produced by clinching using different tools , 2015 .

[8]  Toru Kato,et al.  Mechanism of superiority of fatigue strength for aluminium alloy sheets joined by mechanical clinching and self-pierce riveting , 2012 .

[9]  Pierre-Olivier Bouchard,et al.  Kriging metamodel global optimization of clinching joining processes accounting for ductile damage , 2013 .

[10]  A. Di Ilio,et al.  An experimental study on clinched joints realized with different dies , 2014 .

[11]  Jacek Mucha,et al.  The analysis of lock forming mechanism in the clinching joint , 2011 .

[12]  R. Rolfes,et al.  Material Characterization for FEA of the Clinching Process of Short Fiber Reinforced Thermoplastics with an Aluminum Sheet , 2014 .

[13]  Francesco Lambiase,et al.  Joinability of different thermoplastic polymers with aluminium AA6082 sheets by mechanical clinching , 2015 .

[14]  Birgit Awiszus,et al.  Influence of the moisture content on flat-clinch connection of wood materials and aluminium , 2014 .

[15]  A. Di Ilio,et al.  Damage analysis in mechanical clinching: Experimental and numerical study , 2016 .

[16]  J. Toby Mottram,et al.  A review of the behaviour and analysis of bolted connections and joints in pultruded fibre reinforced polymers , 2015 .

[17]  A. Langella,et al.  Bearing Behavior of Drilled and Molded-in Holes , 2009 .

[18]  Huiyan Yang,et al.  Study of mechanical properties for copper alloy H62 sheets joined by self-piercing riveting and clinching , 2015 .

[19]  Jacek Mucha,et al.  The experimental analysis of the double joint type change effect on the joint destruction process in uniaxial shearing test , 2013 .

[20]  R. Rolfes,et al.  Material Modelling of Short Fiber Reinforced Thermoplastic for the FEA of a Clinching Test , 2014 .

[21]  Byung-Min Kim,et al.  Design of hole-clinching process for joining of dissimilar materials – Al6061-T4 alloy with DP780 steel, hot-pressed 22MnB5 steel, and carbon fiber reinforced plastic , 2014 .

[22]  A. Di Ilio,et al.  Joining aluminium alloys with reduced ductility by mechanical clinching , 2015 .