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Fatigue assessment of bolted L-flange connections considering preload loss and local bending: Experimental investigation and fracture-mechanics-based analysis
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DOI：10.1016/j.ijfatigue.2026.109887.png)
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Abstract
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• High tension-tightening preload significantly improved fatigue life of bolted connection. • Cyclic loading accelerated preload relaxation and increased bolt stress range. • Equivalent stress captured preload loss and bending effects and reduced scatter. • Thermo-mechanical FE modelling accurately reproduced bolt preload behaviour. • Fracture-mechanics framework successfully predicted S-N curves of connections.
Keywords:
Fatigue life
Bolt, S-N curve
Fatigue crack growth
L-flange connection
Preload
Stress intensity factor
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