Mechanics of Materials 1 Part 2 docx

... beam and hence determine the position of any points of contraflexure. [S.F. -20 , +43, -47, +30kN B.M. - 12 , 18 .75, - 18 kNm; 0. 313 and 2. 55 311 1 from 1. h. support.] 3.9 (A/B). A beam ... L /2. - 5wL4 - -__ 384El WL3 , 24 EI Similarly (2) =*- at the ends of the beam. (5 . 12 ) (5 .13 ) 88 Mechanics of Materials Direct Bending stress str...

Ngày tải lên: 10/08/2014, 12:21

... (A2r2 + Bz/r2 + C2r4 + D2)cos 28 (8 .11 9) (8 . 12 0) 1 a,, = -(2A2 + 6B2/r4 + 4D2/r2) cos 28 OM = (2A2 + 6B2/r4 + 12 C2r2)cos28 rd = (2A2 - 6B2/r4 + 6C2r2 - 2D2/r2) ... octahedral shear stress is 1 roct = 5 [(a1 - ad2 + ( 02 - 03 )2 + (03 - a1 )'I 1& apos ;2 1 /2 = 4 [ (28 0 - 50 )2 + (50 + 12 0 )2 + ( - 12 0...

Ngày tải lên: 10/08/2014, 12:21

... University Press, New York, 19 98. Hertzberg, R.W., Deformation and Fracture Mechanics of Engineering Materials, 3rd ed., Wiley, New York, 19 89. x Chapter 1 Introduction 1. 1. HISTORICAL BACKGROUND Fatigue ... consideration in the disciplines of solid mechanics or strength of materials. In fact, one of the earliest researchers to address the topic was Wöhler [1] , who, in...

Ngày tải lên: 03/07/2014, 20:20

... causes of individual HCF failures. The combined findings of these teams centered around many aspects of the design, field usage, and materials and their characterization. In particular, the use of ... history. Introduction 15 the very high engine speeds. In a series of these types of failures, there were no failed parts recovered from which to deduce the failure scenario in te...

Ngày tải lên: 03/07/2014, 20:20

... Mater. Struct., 25 , 20 02, pp. 823 –830. 11 . Fatigue and Fracture of Engineering Materials and Structures, 22 , No. 7, 19 99. 12 . Fatigue and Fracture of Engineering Materials and Structures, 25 , No. 8/9, 20 02. 13 . ... Fatigue, 23 , Supp. 1, 20 01, pp. S143–S1 51. 3. Bathias, C., “There is no Infinite Fatigue Life in Metallic Materials , Fatigue & Fracture of...

Ngày tải lên: 03/07/2014, 20:20

... 49.79 1. 23 50. 61 0.77 2 48 .13 0.58 51. 63 2. 20 51. 82 2.70 3 49.35 0.48 49.04 1. 15 51. 92 6.53 4 48.75 1. 64 49. 32 1. 28 49. 81 2. 25 5 50. 42 0.74 49.65 0.59 51. 23 4. 92 6 51. 92 0.74 51. 13 1. 54 49.94 1. 97 7 ... s 14 998 1 52 5075 3 01 50 61 0.77 24 853 544 52 66 1 90 51 82 2.70 35056 14 19 52 75 1 31 51 92 6.53 44973 5 81 5038 2 77 49...

Ngày tải lên: 03/07/2014, 20:20

... and 60 70 80 90 10 0 11 0 12 0 13 0 10 4 10 5 10 6 10 7 10 8 S –N tests S –N run-out Step run-out Step tests σ max (ksi) N Ti -17 R = 0 .1 350 Hz Figure 3.39. Fatigue data for Ti -17 at R =0 1. Accelerated ... fits for Ti-6Al-4V. 12 2 Introduction and Background 50 60 70 80 90 10 0 10 4 10 5 10 6 10 7 10 8 10 9 S –N tests S –N run-out Step run-out Step tes...

Ngày tải lên: 03/07/2014, 20:20

... established. ∗ This type of formulation has little, if any, mechanics- based justification. Fretting Fatigue 2 91 0 10 0 20 0 300 400 500 600 700 800 –0 .15 –0 .1 –0.05 0 0.05 0 .1 0 .15 0 .2 0 .25 Axial strees ... behavior is the same at about 10 4 cycles. While 29 0 Effects of Damage on HCF Properties –600 –400 20 0 0 20 0 400 600 800 –0 .15 –0 .1 –0.05 0 0.05 0 .1 0 .1...

Ngày tải lên: 03/07/2014, 21:20

... /s Blunt edge specimen 1. E + 04 1. E + 05 1. E + 06 1. E + 07 1. E + 08 1. E + 09 1. E + 10 0 0.0 025 0.005 0.0075 0. 01 0. 0 12 5 0. 015 Impact site offset from zero (inches) Fatigue ... effects of various parameters on leading edge damage, residual stress distribution, and predicted 370 Effects of Damage on HCF Properties 0.0 0 .2 0.4 0.6 0.8 1...

Ngày tải lên: 03/07/2014, 21:20

... (MPa) Ti 8 -1- 1 Figure 8 . 12 . Haigh diagram for Ti 8 -1- 1 at 27  C and 26 0  C. 390 Applications 0 1 2 3 4 5 0.0 10 20 30 40 50 Alternating stress Mean stress α = 5 α = 4 α = 3 α = 2 Figure 8 .11 . Haigh ... plotted on a Haigh diagram at 27  C and 26 0  C as shown in Figure 8 . 12 . 0 10 0 20 0 300 400 500 0 20 0 400 600 800 10 00 12 00 27 °C, Mean 27 °C, –97.5%...

Ngày tải lên: 03/07/2014, 21:20