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Numerical Simulation of Impact Welding Processes with LS-DYNA

Pabst, Christian ; Groche, Peter :
Numerical Simulation of Impact Welding Processes with LS-DYNA.
In: 10th European LS-DYNA Conference, Würzburg.
[ Konferenzveröffentlichung] , (2015)

Kurzbeschreibung (Abstract)

Impact welding enables metallurgical bonding even between dissimilar metals. The bond is formed during a high speed impact between the two workpieces to be joined under accurately defined conditions. In the application, the accelerating force is provided by an explosive (explosion welding, EXW) or by an electromagnetic field (electromagnetic pulse welding, EMPW). One workpiece is usually accelerated within a few millimeters up to 200 m/s and above. The impact and consequently the bond formation takes place in only a few microseconds which makes it hard to observe. In order to enable the observation of the two mentioned processes, a test rig has been built at the Institute for Production Engineering and Forming Machines which produces the impact purely mechanically. The numerical simulation with LS-DYNA is used to gain detailed insights into the process. Three phenomena, which are thought to have a significant effect on the bond formation, are currently investigated numerically: The supersonic displacement of the surrounding gaseous medium, the strains and strain rates at the bonding zone and the macroscopic flow of material. The results of the numerical simulations are compared to experimental and metallographic investigations. The comparison and fusion of the findings are used to draw new conclusions on the formation mechanisms of the bonding zone.

Typ des Eintrags: Konferenzveröffentlichung
Erschienen: 2015
Autor(en): Pabst, Christian ; Groche, Peter
Titel: Numerical Simulation of Impact Welding Processes with LS-DYNA
Sprache: Englisch
Kurzbeschreibung (Abstract):

Impact welding enables metallurgical bonding even between dissimilar metals. The bond is formed during a high speed impact between the two workpieces to be joined under accurately defined conditions. In the application, the accelerating force is provided by an explosive (explosion welding, EXW) or by an electromagnetic field (electromagnetic pulse welding, EMPW). One workpiece is usually accelerated within a few millimeters up to 200 m/s and above. The impact and consequently the bond formation takes place in only a few microseconds which makes it hard to observe. In order to enable the observation of the two mentioned processes, a test rig has been built at the Institute for Production Engineering and Forming Machines which produces the impact purely mechanically. The numerical simulation with LS-DYNA is used to gain detailed insights into the process. Three phenomena, which are thought to have a significant effect on the bond formation, are currently investigated numerically: The supersonic displacement of the surrounding gaseous medium, the strains and strain rates at the bonding zone and the macroscopic flow of material. The results of the numerical simulations are compared to experimental and metallographic investigations. The comparison and fusion of the findings are used to draw new conclusions on the formation mechanisms of the bonding zone.

Freie Schlagworte: numerical simulation; impact welding; material parameters; process window
Fachbereich(e)/-gebiet(e): 16 Fachbereich Maschinenbau
16 Fachbereich Maschinenbau > Institut für Produktionstechnik und Umformmaschinen (PtU)
Veranstaltungstitel: 10th European LS-DYNA Conference
Veranstaltungsort: Würzburg
Hinterlegungsdatum: 13 Jul 2015 07:29
ID-Nummer: 15 - 17 June
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