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

DSTO-TR-1477Simulated flight hours0 2000 4000 6000 8000 10000 1200010Simulated flight hours0 2000 4000 6000 8000 10000 12000100.10.111Crack depth mm.0.10.01Crack depth inch.Crack depth mm.0.10.01Crack depth inch.KSIF 142 420MPa peen + flaw depthKSIF 147 420MPa peen + flaw depthKSIF 204 420MPa peen + flaw depthKSIF 193 420MPa peen + flaw depthKSIF 191 420MPa peen + flaw depth0.010 5 10 15 20 25 30 35 40IARPO3a + 5ML SpectraA0.001KSIF 142 420MPa peen + EPSKSIF 147 420MPa peen + EPSKSIF 204 420MPa peen + EPSKSIF 193 420MPa peen + EPSKSIF 191 420MPa peen + EPS0.010 5 10 15 20 25 30 35 40IARPO3a + 5ML SpectraFigure 28 Crack growth results for the 420MPa peened specimens where the data includes the measuredflaw depth; A and Type II EPS; B.B0.001Simulated flight hours0 1000 2000 3000 4000 5000 6000 7000 800010Simulated flight hours0 1000 2000 3000 4000 5000 6000 7000 8000100.10.111Crack depth mm.0.10.010.001Crack depth inch.Crack depth mm.0.10.010.001Crack depth inch.0.01KSIF 186 450MPa peen + flaw depthKSIF 183 450MPa peen + flaw depthKSIF 178 450MPa peen + flaw depthKSIF 164 450MPa peen + flaw depthKSIF 146 450MPa peen + flaw depth0.0010 5 10 15 20 25IARPO3a + 5ML SpectraA0.00010.01KSIF 186 450MPa peen + EPSKSIF 183 450MPa peen + EPSKSIF 178 450MPa peen + EPSKSIF 164 450MPa peen + EPSKSIF 146 450MPa peen + EPS0.0010 5 10 15 20 25IARPO3a + 5ML SpectraFigure 29 Crack growth results for the 450MPa peened specimens where the data includes the measuredflaw depth; A and Type II EPS; B.B0.000125