1. Fatigue design of welded joints
1.1 Fatigue damage – Steps – Influencing factors
While under increasing monotonic static loading, internal damage to a metallic material only appears after the possibilities for plastic deformation have been exhausted, i.e., very late when triaxiality is low, fatigue damage manifests itself above a certain load variability threshold and accumulates over the course of loading cycles in a three-stage process:
initiation of a microcrack;
propagation (stable growth) of the crack;
fracture (unstable crack growth) in a ductile and/or brittle manner.
Below a certain threshold of load variability, damage to a sound structure does not occur...
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Fatigue design of welded joints
Verification of suitability for use of defective welded assemblies
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