Multiaxial Fatigue of Preloaded Threaded Fasteners

Abstract

This experimental study investigates the effect of cyclic multiaxial loading on the High Cycle Fatigue (HCF) life of preloaded threaded fasteners. A special fixture is used for orienting test bolts at different angles relative to the direction of the cyclic load applied by an MTS fatigue testing system. The orientation angle converts the external cyclic load to a combined cyclic axial and shear loading on test bolts. Test data is used for creating the S-N curves for various multiaxial load combinations. The effect of cyclic stress amplitude and mean stress level are investigated.

Elastic-Plastic Behavior of Threaded Fasteners Under Multi-Axial Loads

“…There do also exist a reasonable number of papers on fatigue failure of fasteners under cyclical multiaxial loading. [3,4,7] This area of research is certainly not entirely groundbreaking, but it is undoubtedly in need of further exploration. One of the largest issues in attempting to understand the behavior of fasteners in multiaxial loading is the complex geometry of the threads.…”