A Mixed Numerical-Experimental Method to Characterize Metal-Polymer Interfaces for Crash Applications

Richter, Jonas; Kuhtz, Moritz; Hornig, Andreas; Harhash, Mohamed; Palkowski, Heinz; Gude, Μaik

doi:10.3390/met11050818

Cited by 11 publications

(8 citation statements)

References 18 publications

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“…The steel sheets were subjected to electrolytic galvanizing. A 0.6 mm thick thermoplastic polyolefin (polypropylene-polyethylene-PP/PE, Konrad Hornschuh AG, Weißbach, Germany) foil was used as core material [27,28]. These three-layered samples are abbreviated further on "MPM".…”

Section: Resultsmentioning

confidence: 99%

Improving the Quality of Laser-Welded Butt Joints of Metal–Polymer Sandwich Composites

et al. 2022

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Sandwich panels are promising composite materials, although the possibilities for their thermal joining are limited due to the degradation of the polymer core at elevated temperatures. The purpose of this study is to improve the quality of the butt joints in metal–polymer sandwich composites performed by laser welding. A pulsed Nd:YAG Rofin StarWeld Performance laser was used to perform the two-sided welding of the metal–polymer three-layer composite material. On each of the two sides of the material, a welded joint was made with partial penetration of the covering steel sheets, which was considered a prerequisite for preventing the degradation of the core polymer layer. The energy density of the laser irradiation was redistributed by increasing the diameter of the laser spot. The structure of the welded joints was examined using a polarized optical microscope and a scanning electron microscope. It was determined that the laser treatment resulted in a partial penetration weld on each of the two covering metal sheets of the material, reaching a depth of more than 50% of the sheet’s thickness without damaging the polymer. The welding area consisted of two zones, one being the weld metal and the other the heat-affected zone. As a result of relatively rapid heating and cooling cycles, fine-dispersed structures were formed in the heat-affected and remelted zones. The performed tensile tests showed that the strength of the welded area was about 80% of that of the base material.

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Section: Resultsmentioning

confidence: 99%

Improving the Quality of Laser-Welded Butt Joints of Metal–Polymer Sandwich Composites

et al. 2022

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“…To perform the welding on both sides, the three-layered MPM samples were made of DPK 30/50+ZE dual-phase steel (HCT500X, Thyssenkrupp Steel Europe AG, Duisburg, Germany, grade number: 1.0939, DIN EN 10346:2009-07 [28]) as cover sheets that were electrolytic galvanized and a polypropylene-polyethylene (PP-PE)-foil as core material [29,30] with thicknesses of 0.48/0.3/0.48 mm. A VEGA\\SB, Tescan scanning electron microscope (Tescan, a.s., Brno, Czech Republic) having a tungsten cathode with thermionic emission and a voltage range of 0.2-30 kV was used to examine the weld joint obtained by pulsed-periodic laser irradiation.…”

Section: Experimental Investigationsmentioning

confidence: 99%

Laser Welding of Metal-Polymer-Metal Sandwich Panels

Murzin

Palkowski

Melnikov

et al. 2022

Metals

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In the production of metal-polymer multilayer composite parts, e.g., for automotive applications, the possibilities of thermal joining are limited due to the instability of the polymer core at elevated temperatures. Accordingly, such materials require a special approach to their welding. The three-layered metal-polymer-metal samples were made of DPK 30/50+ZE dual-phase steel as cover sheets that were electrolytic galvanized, and a polypropylene-polyethylene foil as core material, with thicknesses of 0.48/0.3/0.48 mm. The samples were welded on both sides using a 1.06 µm Nd:YAG ROFIN StarWeld Manual Performance laser. Significant improvements of the welding conditions are achieved by machining the edges of materials to be welded. The parameters of laser welding were chosen in such a way that the polymer structure remained almost unchanged. The weld thickness was about 40% of the thickness of each steel layer. It was established that within the selected laser processing parameters the melting occurred uniformly, while the polymer layer practically did not change its structure. Therefore, it can be stated that two-sided joint welding of metal-polymer-metal composite sandwich panels, without significant degradation of the polymer core layer, is feasible.

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“…46,47 To date, few investigations have been carried out to evaluate the metal-polymer-metal layered hybrid structures. Richter et al 48 investigated the interface properties of steel-PP/PE polymer-steel sandwich sheet with the Double Cantilever Beam (DCB) test. An epoxy adhesive agent was used to bond the dissimilar materials.…”

Section: Introductionmentioning

confidence: 99%

Novel AA7075/AA2124-SiC-17p laminated structures for aerospace applications: A Comparative study into the mechanical performance of PA6 and PA66 composite interlayers

Öztoprak

2022

Journal of Composite Materials

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Multimaterial designs consisting of metallic and polymeric material are aimed to reach high lightweight potential. This study presents novel hybrid structures with different interlayer of thermoplastic composites not previously reported in the literature for multi-laminated composites. The metal-polymer-metal hybrids comprise of polyamide 6 (PA6) or polyamide 6,6 (PA66) composite reinforced with 15% of short glass fiber as a sandwich layer. AA7075/AA2124-SiC-17p composite laminates are bonded through hot pressing connection. Mechanical properties of the structures are experimentally investigated from the point of maximum shear strength between dissimilar laminates, resistance to fracture and energy absorbing capacity. Scanning electron microscope (SEM) analysis of fracture surfaces is carried out after mechanical characterization. Short beam three-point-bending tests show that the laminate on which the load is applied is of great importance for the asymmetric hybrid structures. Shear dominant failure is only visible when the bending load is performed from the AA7075 surface. Single-edge notched bending (SENB) test results indicate that there is no significant difference between two configurations in terms of the Mode-I fracture toughness. V-notch Charpy impact tests reveal that the interlayer of PA6 composite contributes to a 13.15% more absorbed energy than that of the PA66 interlayer.

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A Mixed Numerical-Experimental Method to Characterize Metal-Polymer Interfaces for Crash Applications

Cited by 11 publications

References 18 publications

Improving the Quality of Laser-Welded Butt Joints of Metal–Polymer Sandwich Composites

Improving the Quality of Laser-Welded Butt Joints of Metal–Polymer Sandwich Composites

Laser Welding of Metal-Polymer-Metal Sandwich Panels

Novel AA7075/AA2124-SiC-17p laminated structures for aerospace applications: A Comparative study into the mechanical performance of PA6 and PA66 composite interlayers

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