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Failure criteria in static and fatigue tests, application in the case of mechanical joints

 
: Fuchs, N.; Delin, M.; Wanner, M.-C.; Henkel, K.-H.

International Automotive Body Congress 2009 and Global Powertrain Congress 2009. IABC 2009 Vaals/GPC 2009 Vaals
Red Hook, NY: Curran, 2009
ISBN: 978-1-61567-698-9
S.200-207
International Automotive Body Congress (IABC) <2009, Vaal>
Englisch
Konferenzbeitrag
Fraunhofer IPA ()

Abstract
The yield load equivalent for mechanical joints is a characteristic joint value, which appraises the joint specific deformation behavior. The value considers the maximum load of a joint as well as the ductility of the joint. Therefore the value is a combined strength / deformation value with high information content. The value guaranties an adequate joint deformation reserve. The shown examples and the application variety prove the adaptability of the yield load equivalent. Those examples as been verified for different fastener types and joint geometries. Based on the appraisal of shear loaded lock bolt and blind rivet joints the yield load equivalent has been used and proven for the appraisal of: 1. punch rivets / self piercing riveting 2. clinching 3. spot welding 4. tension loaded joints 5. peel loaded joints The appraisal of multiple joint specimens was difficult and is now possible with the yield load equivalent. For this kind of joints the yield load equivalent de liver the possibility to describe the complex joint characteristic with one comparable value. The easy appraisal of the transition area between force and form closure is an additional and important issue for the characterization of load bearing characteristic of mechanical joints. Due to this value a comparability of test result is possible without knowledge of the exact test assembly. Current research projects at the Fraunhofer AGP - Rostock have the goal of implementing the yield load equivalent in national guidelines and standards for dimensioning of blind rivet and lock bolt joints.

: http://publica.fraunhofer.de/dokumente/N-263450.html