Report 6, Annex 6. Fatigue Failure of AV119 and F241 Strap Lap Shear Joints

This report presents the results of experimental tests and finite element analysis of fatigue tests on adhesively bonded strap lap shear joints. Two types of adhesive were used, a one-part rubber toughened epoxy adhesive, AV119 (Araldite 2007) from Ciba (now Vantico) and a two-part acrylic adhesive, F241 from Permabond. Fatigue tests were performed in tension at a frequency of 2Hz and a ratio of minimum to maximum load (i.e. load ratio, R) of 0.1. For the AV119 adhesive the relationship between applied load level and number of cycles to cause crack initiation was linear on a log-log plot, which is a power law relationship. Similar trends were seen for the F241 adhesive. Results from finite element analysis showed a power law relationship between adhesive equivalent plastic strain and the initiation life.



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