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Extracted text: 6. An NDT (non-destructive) examination of a steel component reveals the presence of a 5-mm-long edge crack. If plane-strain conditions prevail (Kıc = 75 MPam12), what would be the residual service lifetime of the steel part if it were subjected to repeated stresses of 400 MPa? da = 4 x 10-37 AK* dN If the next inspection procedure is scheduled in 6 months, should the component be replaced now or retained in service, given that the stresses fluctuate every 4 hours?