ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Incremental sheet forming is known to give higher forming limits than conventional sheetforming processes, but investigation of this effect has been impeded by the computational cost ofprocess models which include detailed predictions of through thickness behaviour. Here, asimplified process is used to gain insight into the mechanics of a broad class of incremental formingprocesses. The simplified process is described and shown to give increases in forming limitscompared to a conventional process with the same geometry. A model of the process is set up witha commercial finite element package, validated, and used to trace the history of a ‘pin’ insertedperpendicularly into the workpiece. The history of the deformation of the ‘pin’ demonstratessignificant through thickness shear occurring in the direction parallel to tool motion. This insight isused to modify an existing analysis used to predict forming limit curves. The analysis shows that fora sheet with uniform proportional loading, the forming limit is increased when through thicknessshear is present, and this is proposed as an explanation for the increased forming limits ofincremental sheet forming processes
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.344.621.pdf
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