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Stiffness analysis of spot joints as a condition for the numeric modelling - new test methods

 
: Neugebauer, Reimund; Jesche, F.; Mauermann, R.; Hensel, S.

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Fulltext urn:nbn:de:0011-n-942090 (404 KByte PDF)
MD5 Fingerprint: 4dedc57999ae233861e38a778a975459
Created on: 8.4.2011


University of Twente, Enschede; European Scientific Association for Material Forming:
12th International ESAFORM Conference on Material Forming 2009. Book of Abstracts : April 27-April 29, 2009, Twente
Enschede, 2009
4 pp.
International Conference on Material Forming <12, 2009, Enschede>
English
Conference Paper, Electronic Publication
Fraunhofer IWU ()
structure testing; spot joint; spot joint stiffness; identification; mechanical joining; simulation

Abstract
Accurate numerical calculation of stresses in structures with a multitude of spot joints continues to be a challenge, especially if local stresses are located in the area of joining positions or if crack endangerment needs to be addressed. In addition to inadequate FE modelling, a major cause for this is the unavailability of exact primary data, which describe the properties of the joints. New methods for determining the stiffness behaviour of joint connections bases on the measurement of the relative displacement of the sheet metals between the joints during applying a load. The measured relative displacement is proportional to the deformations in the joint area. Strain of the test specimen as well as deformations of the load frame or the force measuring cells have no effect in the relative displacement. Two test methods and the necessary measurement technology will be described. On the one hand a method for symmetric joint connections will be shown and on the other hand a method for unsymmetrical pairings of sheets. For the first case a 2-point-shear-load-specimen is used, for the second a 3-point-torsion-test.

: http://publica.fraunhofer.de/documents/N-94209.html