Mechanics of Materials 1 Part 8 pps

... Introduction 11 .1. 1 The SIN curve 1 1. 1.2 PISIN curves 1 1 .1. 3 Effect of mean stress 1 1 .1. 4 Effect of stress concentration 11 .1. 5 Cumulative damage 1 1. 1.6 Cyclic stress-strain 1 1 .1. 7 ... COS 28 (1. 13) Combining eqns. ( 1 .12 ) and (1 .13 ) gives (1. 14) and combining eqns. (1 .lo) and (1. 1 1) gives I, + I,, = I, + I, (1. 15)...

Ngày tải lên: 10/08/2014, 12:21

... Introduction and Background 0 0.5 1 1.5 2 1 –0.5 0 0.5 1 Haigh equation k 1 = 0.0, k 2 = 1. 0 k 1 = 0.25, k 2 = 0.75 k 1 = 0.5, k 2 = 0.5 k 1 = 0.75, k 2 = 0.25 k 1 = 1. 0, k 2 = 0.0 σ mean /σ ult σ alt ... aid of Figure 2.40, where the conditions for initiation compared to propagation are shown schematically. The initiation of a crack, if associated with the 0 ×...

Ngày tải lên: 03/07/2014, 20:20

... 0 1 2 2 3 4 5 6 0 10 0~ 6= 600 10 0x12 =12 00 12 00 13 20 14 40 16 80 19 56 - 72 69 69 68 66.3 61. 6 54.5 - 10 0 10 0 12 12 12 12 12 - 3.2 6.2 51. 3 55.6 59 .1 64 .1 66.0 ... 15 00 3000 416 0 2500 2500 2000 10 00 0 34 .1 26.6 20 .8 33.4 33.4 38. 4 48. 4 - 10 0 10 0 10 0 10 0 50 50 50 0 35 .8 55 .8 60.6 58. 4...

Ngày tải lên: 10/08/2014, 12:21

... 9.37 58) - (1. 25 W - 6.2 58) 1 - EI x 10 3 1 =- (1. 56 W+ 15 .62 58) EI x 10 3 Now the total horizontal deflection of A = 0 -3 .12 5 W+ 5.2 088 + 1. 56 W+ 15 .62 58 = 0 - 1. 565 ... aM My, = 0 .1 W-Hs, and ~ aH 0.25 .I 0 0.25 1 E1 = - 1 (-0 .1 Ws, + Hs:)ds, 0 1 0. 015 62 58 +3 (- 3 .12 5 W+ 5.2 088 ) 1 - EI x...

Ngày tải lên: 10/08/2014, 12:21

... 4~2 ~1 336 Mechanics of Materials $13 .7 re I up =ux uq =uy =o r,, :O 1 1 1 I 1 I I O0 45" 90" 13 5' 18 0" 225' 270" 315 ' ? 3" ;8 ... +42: ,1 = 3 x 20 + 3J[202 + (4 x 402)] = 10 + 5J( 68) = 10 + 5 x 8. 246 = 51. 23MN/mZ and a2 = 10 - 41. 23 = - 31. 23 MN/m2 (b) Then a -a, 51. 2...

Ngày tải lên: 10/08/2014, 12:21

... the points of intersection of the loci and the load line with a slope of 10 0/ - 10 0 = - 1. 400k2 Distortion energy Max principal stress Fig. 15 . 18 . Thus from Fig. 15 . 18 the safety ... each type of gauge the reader is referred to the references listed at the end of this chapter. 4 48 Mechanics of Materials 16 .1S 16 .15 . Production of fringe patt...

Ngày tải lên: 10/08/2014, 12:21

... del 2 (11 t dsl + (12 t dS2 ~ ) = pdsl .dS2 2 2 Fatigue, Creep and Fracture 50 1 a- da = i 1 (1 12~&iii)~.* 0.005 = 14 .8( -11 .88 + 11 78) = 11 56 cycles. Example 11 .13 In ... + C) 10 23 (1, 3000 + C) = 10 73 (1, 500 + C) 10 23 (8. 0064 + C) = 10 73(6. 214 6 + C) 81 9 0.5 + 10 23C = 66 68. 27 + 10 73C 15 22.23 = 50C C = 30.44. 5 18...

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, i...

Ngày tải lên: 03/07/2014, 20:20

... −3 01 9E +11 0 1 −5956E +14 05 −4 91 0E +12 0 8 −7 51 9E +11 0 10 20 30 40 50 010 20304050 59 Hz HCF data Alternating stress (ksi) Mean stress (ksi) R = 1 R = –0.33 R = 0 .8 R = 0.5 R = 0 .1 46 ... subset Number of tests k m Walker exponent, w A R ≤−0 1 @ 59 Hz 24 5 .83 E16 −7 17 0 16 5 C R ≤−0333 @ 59HzR= 0 1 @ 370–400 Hz 20 7.63E16 −6 98 03 81 7 52 Introduc...

Ngày tải lên: 03/07/2014, 20:20

... several steels: 0 .86 % carbon, 0 .11 % carbon, rolled, Armco iron, Copper Aluminium a b 0 .86 % carbon Armco iron FREQUENCY-CYCLES PER SEC. 10 ,000 3,000 1, 000 300 14 16 18 20 22 24 26 28 30 32 34 4 5 6 FATIGUE ... behavior of materials. Dealing ∗ See Chapter 2, Section 2, for a discussion of gigacycle fatigue and testing at 20 kHz. 12 8 Introduction and Background 5 5.5 6...

Ngày tải lên: 03/07/2014, 20:20