Mechanics of Materials 1 Part 1 potx

... Root causes of HCF 11 1. 5 .1 Field failures 13 1. 6 Damage tolerance 16 1. 6 .1 Application to HCF 20 1. 7 Current status 23 1. 8 Field experience 25 2 Characterizing Fatigue Limits 27 2 .1 Constant ... Interactions 14 5 4 .1 Small cracks and the Kitagawa diagram 14 5 4 .1. 1 Behavior of notched specimens 14 9 4.2 Effects of LCF loading on HCF limit stress 15 3 4.2 .1...

Ngày tải lên: 03/07/2014, 20:20

... B 12 C 11 D 21 + B 12 C 12 D 22 A 12 = B 11 C 11 D 11 + B 11 C 12 D 12 + B 12 C 11 D 21 + B 12 C 12 D 22 A 21 = B 21 C 11 D 11 + B 21 C 12 D 12 + B 22 C 11 D 21 + B 22 C 12 D 22 A 22 = B 21 C 21 D 11 + ... Fracture Mechanics 1 11. 2 Stress Intensity Factors 2 11 .3 Fracture Properties of Materials 10 11 .4 Examples 11 11...

Ngày tải lên: 11/08/2014, 15:21

... and Benham [17 ] for stainless steel sheet (see, also, [18 ]). In that work notched (K t = 244) Appendix I 633 0 50 10 0 15 0 0 200 400 600 800 10 00 12 00 N = 1 N = 10 0 N = 1, 000 N = 10 ,000 N = 1 N = 10 0 N ... analysis. 0 50 10 0 15 0 200 250 0 200 400 600 800 10 00 12 00 N = 1 N = 10 ,000 N = 1 N = 10 ,000 Alternating stress (MPa) Mean stress (MPa) R = 0 R = 0.5 R...

Ngày tải lên: 03/07/2014, 20:20

... fewer specimens. 10 5 950 10 00 10 50 11 00 10 6 10 7 10 5 10 9 10 10 Failure Run-out Maximum stress (MPa) Number of cycles 18 00 Hz R = 0.8 Figure 3.20. S–N data for establishing N f at 10 9 cycles. Accelerated ... “up-and-down” method in the early days of its development and usage. Accelerated Test Techniques 87 0 × 10 0 5 × 10 5 1 × 10 6 1. 5 × 10 6 2 × 1...

Ngày tải lên: 03/07/2014, 20:20

... generated at 11 00  F, for R =0 1 and 0.8 in the <0 01/ 010 > orientation on alloy PWA 14 84. After precracking, the specimen was run at a stress ratio of 0 .1 at a frequency of 10 CPM (0 .16 7 Hz) ... cycling is in the region of the HCF threshold where a significant portion of the total time for crack growth to failure takes place. 10 –6 10 –5 10 –4 10 –3 10 1...

Ngày tải lên: 03/07/2014, 20:20

... strength, 0 0.2 0.4 0.6 0.8 1 1 1. 5 2 2.5 3 3.5 4 4.5 5 a N = 0.2, d = 0 .1 a N = 0.5, d = 0 .1 a N = 0.2, d = 0.25 a N = 0.5, d = 0.25 a N = 0.2, d = 0.75 a N = 0.5, d = 0.75 1/ K t 1/ k f k t k t ... k fav 1 – S m S up + S m S un Figure 5 .12 . Comparison of experimental and empirical curves on Haigh diagram for notched specimens having lives in exce...

Ngày tải lên: 03/07/2014, 20:20

... or major part of aerofoil) of original contour of part. Foreign Object Damage 333 Figure 7 .10 . Example of a distorted blade. Erosion: Gradual removal of metal due to continuous action of impact ... continuous action of impact from very small particles. Gouged: Scooping out of material, usually associated with surface of aerofoil. Figure 7 .11 . Example of a gouged bl...

Ngày tải lên: 03/07/2014, 21:20

... 23 3 19 0 8 496 18 80 2 51 27 25 1 192 18 514 18 81 262 21 37 3 200 17 540 18 82 242 22 32 2 14 0 13 4 51 1883 247 28 21 2 14 1 11 450 18 84 200 23 24 6 11 3 19 385 18 85 19 0 31 17 4 13 0 5 377 Table A.3. ... years, 18 78 18 85 [9] Year Engine axles Tender axles Carriage axles Wagon axles Salt van axles Total Crank or driving Leading or trailing 18 78 266 21 19 3 2...

Ngày tải lên: 03/07/2014, 21:20

... with 4 .13 .3 (e.g., integrally bladed rotors [IBR’s] validated with F100 data). Specific guidance for HCF is provided in sections A.5 .13 .1 through A.5 .13 .3. Because of the complex nature of HCF, ... must be based on 1 per the anticipated number of engines in the fleet or no less than 1 per 10 00 engines as a minimum. In other words, there can be no more than 1 engine with...

Ngày tải lên: 03/07/2014, 21:20

... 593 1. E + 03 10 10 0 R = 1. 0 S eq = 7 611 * N f –.64 71 + 65.39 * N f –.03582 R = 0 .1 R = 0.5 R = 0.8 Avg Regression Results –3s Regression Results Alternating equivalent stress 1. E + 04 1. E ... life. An example of predictions of S th made using the WCN Appendix G 587 15 ° 30° 45°0° VALUE –INFINITY +INFINITY 1. 50E + 04 –5.00E + 04 1. 30E + 10 +2.50E + 04 +5.00E...

Ngày tải lên: 03/07/2014, 21:20