Inspection Evaluation And Repair Of Steel structures Part 3 potx

EM 1110-2-6054

1 Dec 01

2-12

Figure 2-3. Typical fatigue cracking of riveted member

Figure 2-4. Crack surface at the edge of rivet hole

Therefore, fatigue cracks would more likely be detected long before the load-carrying capacity of the riveted

member is exhausted.

d. Fatigue strength of corroded members. For severely corroded members where corrosion notching has

occurred, Category E or E' curves and the corresponding fatigue limits have been suggested for cases. When

corrosion is severe and notching occurs, a fatigue crack may initiate from the corroded region as shown in

Figure 2-5. In cases where corrosion has resulted in loss of more than 20 percent of the cross section, the

corresponding increase in stress should also be considered.