Fraunhofer Representative Office Beijing
Fatigue strength of hybrid joined multi-material structures

© Fraunhofer LBF

Increasingly stringent statutory emission limits are pushing the automotive industry toward innovative lightweight design solutions. In this context, the fatigue strength of thin sheet metal structures, especially made from multimaterial, is becoming increasingly important. As part of the EU-funded research Project "ALLIANCE" on the topic of lightweight design and CO2 reduction, the car manufacturer Opel Automobile GmbH, together with the Fraunhofer Institute for Structural Durability and System Reliability LBF and the System Reliability, Adaptive Structures, and Machine Acoustics department of the Technical University of Darmstadt, has
developed innovative numerical fatigue strength assessment approaches for multi-material joints based on fatigue tests of hybrid joined shear and peel specimens. The method was validated by Fraunhofer LBF scientists with fatigue tests on component-like bowl specimens with the material pairing Steel-Aluminum.

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