Fatigue Crack Growth in 7050T7451 Aluminium Alloy Thick Section ...

DSTO-TR-1477Simulated flight hours0 20000 40000 60000 80000 100000 12000010Simulated flight hours0 20000 40000 60000 80000 100000 120000100.10.111Crack depth mm.0.10.010.001Crack depth inch.Crack depth mm.0.10.010.001Crack depth inch.0.010.01KSIF 194 peened 360MPa + flaw depthKSIF 107 peened 360MPa + flaw depthKSIF 149 peened 360MPa + flaw depthKSIF 152 peened 360MPa + flaw depthKSIF 167 peened 360MPa + flaw depth0.0010 50 100 150 200 250 300 350 400IARPO3a + 5ML SpectraA0.0001KSIF 194 peened 360MPa + EPSKSIF 107 peened 360MPa + EPSKSIF 149 peened 360MPa + EPSKSIF 152 peened 360MPa + EPSKSIF 167 peened 360MPa + EPS0.0010 50 100 150 200 250 300 350 400IARPO3a + 5ML SpectraFigure 26 Crack growth results for the 360MPa peened specimens where the data includes the measuredflaw depth; A and Type II EPS; B.B0.0001Simulated flight hours0104000 8000 12000 16000 20000 24000 28000 32000Simulated flight hours0104000 8000 12000 16000 20000 24000 28000 320000.10.1Crack depth mm.10.01Crack depth inch.Crack depth mm.10.01Crack depth inch.0.10.1KSIF 140 390MPa Peen + flaw depthKSIF 116 390MPa peen + flaw depthKSIF 118 390MPa peen + flaw depthKSIF 205 390MPa peen + flaw depthKSIF 151 390MPa peen + flaw depth0.010 20 40 60 80 100IARPO3a + 5ML SpectraA0.001KSIF 140 390MPa Peen + EPSKSIF 116 390MPa peen + EPSKSIF 118 390MPa peen + EPSKSIF 205 390MPa peen + EPSKSIF 151 390MPa peen + EPS0.010 20 40 60 80 100IARPO3a + 5ML SpectraFigure 27 Crack growth results for the 390MPa peened specimens where the data includes the measuredflaw depth; A and Type II EPS; B.B0.00124