Welded structures subjected to fatigue loads-2
The static strength of the parent metal (and of the filler metal) is of less importance in
determining the fatigue strength of a weldedjoint.
This phenomenon can be explained by the theory of fracture mechanics. We nor-
mally distinguish between three different phases in the growth of a fatigue crack through
the material:
Phase 1:Crack initiation = the number of load cycles required before the discontinui-
ties form a real crack (of the order of hundredths of a millimetre in size).
Phase 2:Crackpropagation = after formation, the crack grows by a given particular
length for each new load cycle.
Phase 3:Final failure = when the crack has grown so much
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