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Difference between generalized and localized cracking

Difference between generalized and localized cracking

Difference between generalized and localized cracking

(OP)
The question may be stupid, but I cannot find any clear definition of both generalized and localized cracking.

Does anybody know the difference, preferably in aircraft structures?
Thank you.

RE: Difference between generalized and localized cracking

localised cracking is an isolated crack, say a crack at a hole.  typically initiated by a specific (individual) flaw.

generalised cracking is several cracks reasonably close together, or multi-site damage.  typically initiated by fatiguing many small (minor) flaws that are replicated at many sites (ie typical manufacturing quality).

RE: Difference between generalized and localized cracking

(OP)
Thank you rb1957!

May I say that cracks found in a joint or fitting (where we have significant load transfer from  fastener to fastener) are localized, while cracks found at a wing skin panel spanwise splice (load transfer is almost zero) are generalized in terms of the wing fatigue life?

Or you think my interpretation is irrelevant?

RE: Difference between generalized and localized cracking

i wouldn't connect the terms with load transfer.  splices with load transfer are just as likely to develop generalised fatigue cracking as those without load transfer.

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