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Simulating Fatigue Cracks Growth in Spiral Bevel Gears Part 6

Tham khảo tài liệu 'simulating fatigue cracks growth in spiral bevel gears part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | table. These curve fit values will be used in the crack growth rate models for the numerical analyses. Crack closure concepts will now be extended to investigate the sensitivity of fatigue crack growth rates to low 7 -vaIues. 1.00E-03 1 i 1.00E-04 1 u 1.00E-05 f s 1.00E-06 J 4 1.00E-07 1 -ị ị -Ị -ị 1.00E-08 ---------- I Keff ksi in0 5 Figure 4.7 Intrinsic fatigue crack growth rate for AISI9310 in 250 oil K 1. Table 4.2 Intrinsic and non-intrinsic fatigue crack growth rate parameters. Test n c n in cycle ksi in 5 n c in cycle ksi in0 n R -1 Air 3.3 6.4e-12 6.30e-10 R 0.05 Air 3.5 7.3e-ll 8.80e-10 0.5 Air 3.9 5.3e-l1 1.98e-10 R -Ỉ Oil 3.2 l.le-11 8.52e-10 R 0.01 Oil 3.2 9.9e-l1 1.09e-9 7 0.5 Oil 3.8 7.9e-ll 2.87e-10 Curve Fit Aừ 3.6 . NA6 4.26e-10 Curve Fit Oil 3.4 . . . NA1 7.44e-10 6 Not Applicable NAS A CR 2000-210062 43 4.4 Sensitivity of Growth Rate to Low R Table 4.3 contains results from calculations of AKeffãt different R-values using Equations 4.1 4.2 4.4 and 4.5 . Constant values for Kmax K and SmaxlGo are assumed. Table 4.3 Calculations to find Keff over a range of R-values for a constant Kmax SIF units are ksi in05. R K Smaxl Go Kmax Rmin K u AKeff 0.705 1.000 0.100 10.000 7.050 2.950 0.825 2.434 0.700 1.000 0.100 10.000 7.000 3.000 0.822 2.467 0.505 1.000 0.100 10.000 5.050 4.950 0 716 3.542 0.500 1.000 0.100 10.000 5.000 5.000 0.713 3.565 0.255 1.000 0.100 10.000 2.550 7.450 0.589 4.388 0.250 1.000 0.100 10.000 2.500 7.500 0.587 4.399 0.005 1.000 0.100 J 10.000 0.050 9.950 0.474 4.714 0.000 1.000 0.100 10.000 0.000 10.000 0.472 4.716 -0.495 1.000 0.100 10.000 -4.950 14.950 0.327 4.886 -0.500 1.000 0.100 10.000 -5.00 15.000 0.326 4.888 -0.955 1.000 0.100 10.000 -9.950 19.950 0.254 5.058 -1.000 1.000 u 0.100 10.000 -10.000 20.000 0.253 5.060 -1.995 1.000 0.100 10.000 -19.950 29.950 0 180 5.402 -2.000 1.000 0.100 10.000 -20.000 30.000 0 180 5.404 -2.995 1.000 0.100 10 000 -29.950 39.950 0.144 5.746 -3.000 1.000 0.100 10.000 -30.000 40.000 0.144 5.748 The .