Fatigue Crack in a Bicycle Frame
A friend of mine showed some time ago her bicycle to me and she asked if the crack in the seat tube would be a fatigue crack. Well, the answer…
Fatigue Analysis using Local Stresses (part 2)
In part 1 of this blogpost it was discussed that also for fatigue analysis using local stresses, the gradient of the S-N curve depends on the stress concentration.But also the…
Fatigue Analysis using Local Stresses (part 1)
The common approach for fatigue life analysis is using S-N curves based on nominal stresses (i.e. average stresses in the net section). Depending on the severity of the stress concentration…
Description of a S-N Curve
Fatigue properties of materials are often described using the fatigue limit or the S-N curve (fatigue curve, Wöhler curve). The S-N curve describes the relation between cyclic stress amplitude and…
What is Fatigue?
Metal fatigue is about the predominant cause of failure of structures. But what is fatigue? Fatigue occurs when a structure is subjected to cyclic loading. If the stress amplitude exceeds…