Simulating Fatigue Cracks Growth in Spiral Bevel Gears Part 5 pot

... 0. 05, and 0 .5. The curves in Figure 4 .5 are obtained by extracting data points from fatigue crack growth rate tests in 250 ° oil for R = -1, 0.01, and 0 .5. Table 4.1 summarizes the slopes and intercepts ... scatter in fatigue crack growth rates at different stress ratios in AISI 9310 steel. Table 4.2 contains the slopes and vertical intercepts from the lines in the figu...

Ngày tải lên: 11/08/2014, 20:21

... failures from tooth bending fatigue to spalling to rolling contact fatigue in both spur and spiral bevel gears, The effective case depth is defined as the depth to reach 50 RC. x[Coy et al. 19 95] 2 [Townsend ... 95. 30 = Maximum 0.13 0.70 0.0 15 0.0 15 0. 35 0. 35 3 .50 1.40 0.001 0. 15 93.39 Most gears are case hardened. Case hardening increases the wear life of the gea...

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... l, log(_l) ntrinsic Ul'Ve Figure 3 .5: Schematic of fatigue crack growth rate data in Paris regime at different stress ratios collapsing into a single "intrinsic" curve. Using Paris' ... focus on crack growth in regime II. Crack initiationl smallcrack effects, and unstable Crack growth (regime III) Will be ignored. A seminal development in predicting fatigue...

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... can NASA/CR 2000-210062 56 5. 4 Method for Three Dimensional Fatigue Crack Growth Predictions Under Non-Proportional Loading As shown in Section 5. 3, a crack in a spiral bevel pinion tooth is subjected ... - 13 14 15 Load Step Figure 5. 10: Typical Kit to KI ratio under moving load. The KH to K_ ratio also indicates which loading mode is driving the crack growth. Mode I dom...

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... reporting burden for this collection of information Is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining ... maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information,...

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... FIVE: PREDICTING FATIGUE CRACK GROWTH TRAJECTORIES IN THREE DIMENSIONS UNDER MOVING, NON- PROPORTIONAL LOADS 47 5. 1 Introduction 47 5. 2 BEM Model 47 5. 2.1 Loading Simplifications 49 5. 2.2 Influence ... CRm2000-210062 Simulating Fatigue Crack Growth in Spiral Bevel Gears Lisa E. Spievak, Paul A. Wawrzynek, and Anthony R. Ingraffea Cornell University, Ithaca, New Yor...

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... die of spiral bevel gears. The progression of research related to computer analysis of gears has led to the investigation of crack growth in spiral bevel gears. FEM models of spiral bevel gears can ... 2.6:OH -58 spiral bevel pinion with two fractured teeth. A spiral bevel gear set is used in the main rotor transmission of the U.S. Army's OH -58 Kiowa Hel...

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... 2.467 0 .50 5 3 .54 2 0 .50 0 3 .56 5 0. 255 4.388 0. 250 4.399 0.0 05 4.714 0.000 4.716 -0.4 95 4.886 -0 .50 0 4.888 -0. 955 5. 058 -1.000 5. O6O -1.9 95 5.402 -2.000 5. 404 -2.9 95 5.746 -3.000 5. 748 daJdN (in cycle 10 ... 10.000 Kmin AK 7. 050 2. 950 7.000 3.000 5. 050 4. 950 5. 000 5. 000 2 .55 0 7. 450 2 .50 0 7 .50 0 0. 050 9. 950 0.000 10.000 -4. 950 t4. 950 -5. 00 1...

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... STUDIES 7.1 Introduction In Chapter 5, fatigue crack growth in the OH -58 spiral bevel pinion under moving, non-proportional loads was predicted. Chapter 6 presented experimental fatigue crack ... presenting data from an OH -58 spiral bevel pinion test. The test was conducted by NASA/GRC. EDM notches were introduced into the root of nine of the pinion teeth to serve as star...

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... parameters. da/dN l° [in/ cycle] 9.30e-6 2.03e-6 Cycles /inch I Fatigue Life 1 107 ,52 7 6 75, 838 492,611 3,096,201 64,9 35 81,301 408,1 45 511,000 The fatigue life estimates using each set of parameters in Table ... al. [1981]11 2 .56 Air test 3.63 [Proprietary 1998] Oil test [Proprietary 1998] _3.36 Fatigue crack growth rate C [ (in/ cycle)/(psi *in 5) ]" 1.08e-13 2.72e...

Ngày tải lên: 11/08/2014, 20:21