Mechanics of Materials 1 Part 15 pps

... 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) 819 0.5 + 10 23C = 6668.27 + 10 73C 15 22.23 = 50C C = 30.44. 518 Mech...

Ngày tải lên: 10/08/2014, 12:21

... 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 6.5 7 7.5 8 . 01 .1 1 5 10 20 30 50 70 80 90 95 99 99.9 99.99 Log ... the purpose of translating strain rates into equivalent frequencies, consider that nominal maximum strains in the HCF regime are of the order of les...

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 ... centre of the web. 1. 3 x 503 25 x 1. 33 IN.A. = [ 12 + 2( 12 + 25 x 1. 3 x 252) = [1. 354+ 2(0.00046+2.03)+2(0. 011 +0.52) ]10 -' = 6.48 x 10 -...

Ngày tải lên: 10/08/2014, 12:21

... (Fig. 11 .7) ( :) ;; 25’ lo6 volume of bar = in x ~ x 2.6 = 12 .76 x O’ x 12 .76 x Then 10 x 10 1. 30 O2 30+- = 10 9 3i3x 10 12 1. 30 30 x 313 x 10 ” f- x 313 x 10 ” ... 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 6258 +3 (- 3 .12 5 W+ 5.2088) 1 - EI x 10 3 278 M...

Ngày tải lên: 10/08/2014, 12:21

... 0,)' + 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 ' ? ... circle (Fig. 14 .13 c), (E1 + 62) OA' x strain scale = ___ 2 But and 1 E 1 E1 + E2 = - [(a, + a,) - v(o1+ a,)] = E (a1 +a,) (1 - v)...

Ngày tải lên: 10/08/2014, 12:21

... of Fracture Mechanics (Butterworths, London), 19 73. 416 Mechanics of Materials 415 .13 lead to the adoption of higher values. Since this could well result in uneconomic utilisation of ... 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 fro...

Ngày tải lên: 10/08/2014, 12:21

... 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 ... 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) Substitution into eqns. (1. 1...

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

... −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 ... <0 01& gt; oriented specimens with the exception of eight spec- imens oriented at < 0 01+ 15& gt; that were tested at R = 08. The <0 01 +15 > oriented data fa...

Ngày tải lên: 03/07/2014, 20:20

... 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