Earth materials 1

... Earth Materials and Health: Research Priorities for Earth Science and Public Health http://www.nap.edu/catalog/11809.html EARTH MATERIALS AND HEALTH RESEARCH PRIORITIES FOR EARTH SCIENCE AND ... of Sciences All rights reserved Earth Materials and Health: Research Priorities for Earth Science and Public Health http://www.nap...

Ngày tải lên: 22/03/2014, 23:20

... 30 % 10 - 15 % - 10 % 80 - 88 % 92 - 95 % Plastic Tiger eye Topaz 1, 460 1, 544 1, 760 1, 544 1, 620 75 - 80 % 65 - 75 % 80 - 85 % Water (gas) Water (20º C.) Zircon 1, 0002 61 1, 33335 1, 800 – 1, 960 ... Air 1, 0002926 55 - 75 % 25 - 30 % 80 - 90 % 60 - 70 % Alcohol Amber 1, 329 1, 546 1, 577 2, 417 Latón muy pulido 70 - 75 % 25 - 35 % Emerald oak Glass 1, 56 1, 51 oak 10...

Ngày tải lên: 01/04/2014, 17:30

... 11 50 -12 00 910 -12 00 910 -930 12 00 -1 A00 11 00 -14 00 2500-3200 12 00 -1 800 680 -1 200 10 0-3000 000 -13 00 10 00 -11 00 550-800 500-550 450 -1 500 500-700 550-600 600-800 400 -1 000 600-650 450 -1 200 300 -1 000 ... x 10 4 2.25-3.75 x lo4 3300-4950 3750- 810 0 41 25-4800 2700-3750 7500-22500 12 000 -1 8000 18 00-3000 19 50-4500 2700-3450 18 00 -1 875 17 25 -1 800...

Ngày tải lên: 27/06/2014, 15:20

... 11 50 -12 00 910 -12 00 910 -930 12 00 -1 A00 11 00 -14 00 2500-3200 12 00 -1 800 680 -1 200 10 0-3000 000 -13 00 10 00 -11 00 550-800 500-550 450 -1 500 500-700 550-600 600-800 400 -1 000 600-650 450 -1 200 300 -1 000 ... x 10 4 2.25-3.75 x lo4 3300-4950 3750- 810 0 41 25-4800 2700-3750 7500-22500 12 000 -1 8000 18 00-3000 19 50-4500 2700-3450 18 00 -1 875 17 25 -1 800...

Ngày tải lên: 27/06/2014, 17:20

... Problems 15 4 15 4 15 5 15 6 15 7 15 8 15 9 15 9 16 0 16 2 16 4 16 5 16 6 17 3 17 6 17 6 17 7 17 9 18 0 18 1 18 2 18 2 18 2 18 2 18 3 18 4 18 4 18 6 18 6 18 7 18 7 18 8 18 9 18 9 19 0 19 5 Contents Thin Cylinders and Shells Summary 9 .1 ... 94 94 97 10 2 10 5 10 6 10 6 10 8 11 2 11 2 11 2 11 5 11 8 11 9 12 3 13 8 14 0 14 0 14 1 14 1 14 2...

Ngày tải lên: 10/08/2014, 12:21

... = - 2y 19 (y - 1) - 4(y - ) i ( y - 1) = -2~ ~ +19 y -19 -2~ ~+4~ -2 =O The point of contraflexure occurs where B.M = 0, i.e where M y , = 0, = -2yz +21 y- 21 58 Mechanics o Materials f i.e 2y2 -21 y+ 21 Then ... = of girder 10 - 12 -f 20 x 26 03 ] +2[ 20 0 12 20 3 ] +20 0x20x 14 0’j x 12 (29 .3+ 0 .26 7 = + 15 6.8) = 1. 86 x m4 Both methods thus yield the same value a...

Ngày tải lên: 10/08/2014, 12:21

... x lo3 x 1. 2) (1. 8+ $ X 1. 2) + (3MAx x $ x 3) + (fMB x x x 3) = (4 x 14 .4 x lo3 x 12 )3 x 1. 2 ( + Y) + (f x 14 .4 x lo3 x 1. 8) (10 1.25 + 31 . 1 + 38 .0 )10 3+ 1. 5MA+ 3MB = (6.92 + 23. 3 )10 3 1. 2 - 1. 5 M ... ~ 2 0 ~ = 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...

Ngày tải lên: 10/08/2014, 12:21

... Mechanics of Materials 19 4 = 1. 43 L2 = 1. 43 L, Ll L2 = 510 mm L l ( l 1. 43 ) = 510 510 L1 = -= 210 mm 2 .43 But + + Example 8 .4 A circular bar ABC, m long, is ... = 2302 x 12 x x = 41 . 6 x = m3 p x 230 x x 41 . 6 x x x - x 200 x 10 9 (5 - 1) 12 10 -6 x x x 10 -3 x 200 x 10 9 = 230 x 10 -3 41 . 6 x 10 -3 x Thus = 1. 25 MN/m2 hoop stress Hence, pd 2t =- = 1. 25...

Ngày tải lên: 10/08/2014, 12:21

... x 0.02 25+ 0.06 258 x 0 . 15 El x 0. 01 +0.06 258 (-0 .1) =- EI x 10 3 E I x 10 3 =- E I x 10 3 { (1. 25 x 2. 25 W+6. 25 x 1. 5H)- (1. 25 W-6. 258 )) { (2. 81 W + 9.3 758 ) - (1. 25W - 6. 258 )1 (1. 56 W+ 15 .6 258 ) Now ... D’, 1. 255 , - 0;- (0:- 10 x 10 -3)2 1. 25 x io - 12 .5 x l o p 30% D; - D;+ 20 x = 7 .5 x 10 -3 x ~ z g = 10 0 Dzg= D i - 10 0 x 10 -6 10 0 x...

Ngày tải lên: 10/08/2014, 12:21

... compressive: 6, = = f ( - 80+ Then = 30)' + ( x 60 ')] + 81. 5 = 56. 5 MN/m2 o2 = -25- 81. 5 tan8, ( -80- - 25 + 5J( 12 1 + 14 4) = - 25 and 30)+*J[ = 56. 5 - ( - 80) 60 - 10 6. 5MN/m2 = 2.28 8, = 6 and 8, = 66 " 19 ' ... C392.7, 57.3 MN/m2; 31. 7" 12 1.7"; 16 7.7 MN/m2, 76. 7", 16 6. 7'; 18 10p .1 13 .13 (B) A 250mm diameter solid shaft drives a screw propeller with an outpu...

Ngày tải lên: 10/08/2014, 12:21

... safety factor - 2264 x - d4 10 6 + (a3 - a1)2 422 Mechanics of Materials d4 = 11 32 x lo6 ( 67. 5 x 10 6)2 d2 = 33.6 x 10 3 = 4.985 x 10 -4m2 67. 5 x lo6 d = 22.3mm Example 15 .4 Assuming the formulae ... alternating current (a.c.) source; Fig 16 .6, for example, Mechanics of Materials 444 $16 .11 shows the circuit excited by means of a standard battery (d.c.) source Figu...

Ngày tải lên: 10/08/2014, 12:21

... 11 .1 Fatigue Introduction 11 .1. 1 The SIN curve 1. 1.2 PISIN curves 11 .1. 3 Effect o mean stress f 11 .1. 4 Effect o stress concentration f 11 .1. 5 Cumulative damage 1. 1.6 Cyclic stress-strain 11 .1. 7 ... 11 4 x 13 [- (83 - x 13 ) x 11 4)][- (19 - t E.J H e m , Mechanics of Materials I Butterworth-Heinemann, 19 97 x 13 )] )10 -'2 Mechanics o Materials f 18 = (0...

Ngày tải lên: 10/08/2014, 12:21

... 0. 018 = RI = tL GR 12 0 10 6 300 10 -3 80 x 10 9 x R , 12 0 io6 300 10 -3 = 0. 012 5 = 12 .5 mm x 0. 018 80 x 10 9 Therefore partially plastic torque, from eqn (3 .12 ), - 7r x 12 0 x 10 6 [4 x 253 - 12 .53 ]10 -9 ... ay, i.e + x ) - 6) ay( 31 - 12 ) x 12 x 2 (1 + = ~~~(30000 216 6 ( 31 - 12 ) + 8 496 6)1OP9 = 0 .11 7 x 10 -3a, M F P 0 .11 7 x shape factor = -ME 0.065...

Ngày tải lên: 10/08/2014, 12:21

... p;, + p:,] 11 2 = [11 1.22+33.g2 + 12 3.62 ]1 2 = 16 9.7 MN/mZ The normal stress a, is given by eqn (8.5), an = pxnl+ pynm + pznn = (11 1.2 x 0. 615 7) + (33.8 x 0.3746) + (12 3.6 x 0.6935) = 16 6.8 MN/m2 ... l'e'tude de l'equilihre! Pans, 18 85; also Cornptes Rendus Acad Sci., 11 4 (18 92) 15 10 -15 16 Flamant AA Compres Rendus Acud Sci 11 4 (18 92) 14 65 -14 68 282 Mechanics...

Ngày tải lên: 10/08/2014, 12:21

... width W and the number of cycles N is given by: w AN-^ where A is a constant and h the measure of the rate of work hardening (11 .15 ) 456 Mechanics of Materials $11 .1 Fig 11 .13 Cyclic stress-strain ... a factor of safety F to both the alternating and the steady component of stress, in which case eqn (1 1.9) becomes: ( 1. 10) Mechanics of Materials 452 $11 .1 Pr M...

Ngày tải lên: 10/08/2014, 12:21