From Test To Design: Verifying Thick-Layer Adhesive Joints Under High Cyclic Loading
Authors: Dr.-Ing. Stephan Koch, Dipl.-Chem. Elisabeth Stammen, M. Sc. Tom Reisewitz, M. Eng. Paul Müller, Prof. Dr.-Ing. Christian Schuler, Univ.-Prof. Dr.-Ing. Geralt Siebert, Professor Dr. Klaus Dilger
DOI: https://doi.org/10.53192/JP20260340
Earthquakes generate random, intense load cycles that subject thick-layer adhesive joints to fatigue loading with few cycles. Reliable design bases for this loading condition are largely lacking. Within the IGF research project RISIKO, the load-bearing and failure behavior of elastic thick-layer adhesive joints under seismic loading was investigated across several scales. Small-scale tests on silicone H-specimens provide reliable S-N curves for predicting fatigue behavior. Sikaflex-668 was additionally investigated as an alternative polyurethane adhesive system, showing promising potential under high cyclic strains. Large-scale tests on bonded facade elements confirm robust behavior at the system level, with no sudden failure observed. The results provide a basis for a practice-oriented design concept for thick-layer adhesive joints under seismic loading.
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