Fatigue behaviour of material-adapted fibre-reinforced polymer/metal joints

2021 ◽  
Vol 3 (1) ◽  
pp. 81-88
Author(s):  
Colin Gerstenberger ◽  
Tomasz Osiecki ◽  
Lothar Kroll
Keyword(s):  
Polyamide 6 ◽  
Fatigue Behaviour ◽  
High Yield ◽  
Cold Forming ◽  
Shear Loads ◽  
Polymer Metal ◽  
Lightweight Engineering ◽  
Micro Alloyed Steel ◽  
Reinforced Thermoplastics ◽  
Cross Tension

By regarding the needs and requirements in modern multi-material joining, the Flow Drill Joining Concept (FDJ) was developed at the Chemnitz University of Technology. The technology allows an efficient and material-adapted joining of thin metal sheets with continuous fibre-reinforced thermoplastics, as required in modern lightweight engineering. For a better understanding of their fatigue behaviour, single-lap FDJ joints were examined in quasi-static and dynamic tests regarding shear loads, cross tension and superimposed shear/cross tension loads. By way of example, joints between micro-alloyed steel with high yield strength for cold forming and a continuous glass/carbon fibre-reinforced polyamide 6 were investigated. The fatigue curves show inclinations between k = 8.01 (shear loads) and k = 5.17 (cross tension loads), depending on the applied load angle. The results of the fatigue testings represent a basis for the enhancement of a failure criterion for FRP/metal joints in highly stressed multi-material designs.

scholarly journals Thermal Efficiency in Laser-Assisted Joining of Polymer–Metal Composites

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4875
Author(s):  
Klaus Schricker ◽  
Mohammad Alhomsi ◽  
Jean Pierre Bergmann
Keyword(s):  
Thermal Efficiency ◽  
Unit Length ◽  
Polyamide 6 ◽  
General Description ◽  
Dimensionless Numbers ◽  
Aisi 304 ◽  
Polymer Metal ◽  
Physical Background ◽  
Polyamide 6.6

Heat conduction joining is mainly used in laser-based joining of metals with polymers but results in a large amount of dissipated heat. The consideration of thermal efficiency allows the determination of power actually used for creating the joint, which is highly relevant for technical and economic reasons, e.g., for calculating the carbon footprint. In order to describe the thermal efficiency universally, process parameters (focal diameter, joining speed, energy per unit length), metallic materials (AA 6082, AISI 304), geometric parameters (overlap width, material thickness) and various polymers (polypropylene, polyamide 6, polyamide 6.6) were examined experimentally. The discussion of the results is supplemented by numerical simulations of the temperature field. For a general description of the physical relationships, some dimensionless numbers based on the Buckingham π theorem were developed, applied to the experimental data. One of these numbers shows similarity to the Fourier number and provides further information on thermal efficiency and its general understanding in the context of polymer–metal joints, enabling the physical background dissipated to stored heat.

Effect of Hot Water Environment on Tensile Fracture Properties of Carbon Fiber Reinforced Polyoxamide Composites

2014 ◽  
Vol 627 ◽  
pp. 177-180
Author(s):  
Kazuto Tanaka ◽  
Shunsuke Maehata ◽  
Tsutao Katayama ◽  
Masahiro Shinohara
Keyword(s):  
Carbon Fiber ◽  
Water Environment ◽  
Polyamide 6 ◽  
Hot Water ◽  
Tensile Fracture ◽  
Fiber Reinforced ◽  
Fracture Properties ◽  
Properties Of Materials ◽  
Carbon Fiber Reinforced ◽  
Reinforced Thermoplastics

Matrices for carbon fiber reinforced thermoplastics are appropriate to use comparatively cheaper resins such as polyamide. However polyamide 6 is highly hygroscopic and the mechanical properties of materials are reported to be degraded by water absorption. Polyoxamide (PX) has been developed as polyamide resins with low hygroscopicity. In this study, the effect of hot water environment on the tensile fracture properties of carbon fiber/polyoxamide composites has been clarified.

Behavior and Quality Evaluation of Electroplastic Self-Piercing Riveting of Aluminum Alloy and Advanced High Strength Steel

2013 ◽  
Vol 135 (1) ◽  
Author(s):  
Ming Lou ◽  
YongBing Li ◽  
YaTing Li ◽  
GuanLong Chen
Keyword(s):  
Shear Strength ◽  
Aluminum Alloy ◽  
High Strength Steel ◽  
High Strength ◽  
Tensile Shear Strength ◽  
Advanced High Strength Steel ◽  
Tensile Shear ◽  
Cold Forming ◽  
Riveting Process ◽  
Cross Tension

The hybrid use of dissimilar lightweight materials, such as aluminum alloy and advanced high strength steel (AHSS), has become a critical approach to reduce the weight of ground transportation vehicles. Self-piercing riveting (SPR) as a preferred cold-forming fastening method is facing problems like weak interlocking and insufficient penetration, due to the reduced formability of AHSS. In this paper, a new process named electroplastic self-piercing riveting (EP-SPR) was proposed to reduce the deformation resistance of AHSS DP780, by applying a direct current (dc) to it during the riveting process. The influence of dc on force and displacement characteristics throughout the riveting process, joint physical attributes and quasi-static performances for two sheet combinations, e.g., AA6061-T6 to DP780 (combination 1) and DP780 to AA6061-T6 (combination 2), were studied and compared with the traditional SPR joints. The results showed that compared with the traditional SPR joints, the EP-SPR ones increased by 12.5% and 23.3% in tensile-shear strength and cross-tension strengths for combination 1, respectively. For combination 2, even though the EP-SPR joints decreased by 5.8% in tensile-shear strength, it could reduce the penetration risk of bottom AA6061-T6, and present a better energy absorption capability for the increased undercut amount. In addition, the corresponding cross-tension strength of EP-SPR joints still increases by 6.1%.

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