Improved Crimp-Joining of Aluminum Tubes onto Mandrels with Undulating Surfaces

Daehn, Glenn S.; Eguia, Inaki; Zhang, Peihui

Improved Crimp-Joining of Aluminum Tubes onto Mandrels with Undulating Surfaces

dc.contributor.author	Daehn, Glenn S.	de
dc.contributor.author	Eguia, Inaki	de
dc.contributor.author	Zhang, Peihui	de
dc.date.accessioned	2010-04-08T08:37:10Z
dc.date.available	2010-04-08T08:37:10Z
dc.date.issued	2004	de
dc.description.abstract	Over its history electromagnetic forming (EMF) has probably seen far and away more application in assembling tubes or rings onto (or into) nominally axisymmetric mating elements. The vast majority of these assemblies does not require any significant structural integrity or strength. However, a small fraction of these are designed and fabricated for mechanically-demanding applications. There are two key factors (which seem to be largely independent) that are key in the design and performance of a crimpedelectromagnetic tube joint. First is the state of residual stress that exists after the crimped joint is created. A natural interference fit seems to be a fairly general feature of EMF crimp joints. This interference gives a backlash-free joint that will not fret. The second key issue is the configuration of the joint. The fabrication of designed interlocking geometries is required to create a joint that maximizes mechanical strength while minimizing the electromagnetic energy and forces required to create it. Both of these issues will be considered here. Here we consider crimping onto textured surfaces such as screw threads and knurls. We show experimentally that approaches of this type can give joints that exceed the strength of the tube both in torsion and axial loading. Analysis methods based on coupling impact-indentation and break-before-strip criteria can be used to compare joints made in this way with those based on the more traditional large scale deformation of the tube. One of the advantages of forming onto 'textured' surfaces is that a number of small pulses (possibly generated by small and inexpensive capacitor banks) can be used to create a joint that has the strength of the parent tube, without any heat affected zones or distortion. Again, the natural interference fit developed by impact eliminates the potential for fretting.	en
dc.identifier.uri	http://hdl.handle.net/2003/27041
dc.identifier.uri	http://dx.doi.org/10.17877/DE290R-12974
dc.language.iso	en	de
dc.publisher	Institut für Umformtechnik - Technische Universität Dortmund	de
dc.relation.ispartof	1st International Conference on High Speed Forming, March 31, April 1, 2004, Dortmund, Germany	de
dc.subject	aluminum	en
dc.subject	electro-impulse	en
dc.subject	joining	en
dc.subject	strength	en
dc.subject.ddc	620	de
dc.subject.ddc	670	de
dc.title	Improved Crimp-Joining of Aluminum Tubes onto Mandrels with Undulating Surfaces	en
dc.type	Text	de
dc.type.publicationtype	conferenceObject	de
dcterms.accessRights	open access

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