كتاب Mechanical Design An Integrated Approach - Ansel C. Ugural
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 كتاب Mechanical Design An Integrated Approach - Ansel C. Ugural

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عدد المساهمات : 14732
التقييم : 24076
تاريخ التسجيل : 01/07/2009
العمر : 29
الدولة : مصر
العمل : مدير منتدى هندسة الإنتاج والتصميم الميكانيكى
الجامعة : المنوفية

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Mechanical Design An Integrated Approach
Ansel C. Ugural


ويتناول الموضوعات الأتية :

P A R T 1
FUNDAMENTALS 2
Chapter 1
INTRODUCTION TO DESIGN 3
1.1 Scope of Treatment 4
1.2 Engineering Design 4
1.3 The Design Process 5
1.4 Design Analysis 8
1.5 Problem Formulation and Computation
1.6 Factor of Safety and Design Codes 11
1.7 Units and Conversion 14
1.8 Load Classification and Equilibrium 1
1.9 Load Analysis 17
1.10 Case Studies 19
1.11 Work and Energy 23
1.12 Power 25
1.13 Stress Components 27
1.14 Normal and Shear Strains 29
References 31
Problems 32
Chapter 2
MATERIALS 38
2.1 Introduction 39
2.2 Material Property Definitions 40
2.3 Static Strength 41
2.4 Hooke’s Law and Modulus of Elasticity
2.5 Generalized Hooke’s Law 47
2.6 Thermal Stress-Strain Relations 51
2.7 Temperature and Stress-Strain
Properties 51
2.8 Moduli of Resilience and Toughness 53
2.9 Dynamic and Thermal Effects:
Brittle-Ductile Transition 55
2.10 Hardness 57
2.11 Processes to Improve Hardness and the
Strength of Metals 59
2.12 General Properties of Metals 61
2.13 General Properties of Nonmetals 65
References 68
Problems 68
t
Chapter 3
STRESS AND STRAIN 71
3.1 Introduction 72
3.2 Stresses in Axially Loaded Members 72
3.3 Direct Shear and Bearing Stresses 75
3.4 Thin-Walled Pressure Vessels 77
3.5 Stress in Members in Torsion 79
3.6 Shear and Moment in Beams 84
3.7 Stresses in Beams 87
3.8 Design of Beams 94
3.9 Plane Stress 102
3.10 Combined Stresses 108
3.11 Plane Strain 114
3.12 Stress Concentration Factors 117
3.13 Importance of Stress Concentration Factors
in Design 118
3.14 Contact Stress Distributions 120
*3.15 Maximum Stress in General Contact 125
3.16 Three-Dimensional Stress 128
*3.17 Variation of Stress Throughout
a Member 134
3.18 Three-Dimensional Strain 136
References 137
Problems 138
Chapter 4
DEFLECTION AND IMPACT 151
4.1 Introduction 152 : .
4.2 Deflection of Axially Loaded Members 152
4.3 Angle of Twist of Bars 156
4.4 Deflection of Beams by Integration 159
4.5 Beam Deflections by Superposition 162
4.6 Beam Deflection by the Moment-Area
Method 166
4.7 Impact Loading 172
4.8 Longitudinal and Bending Impact 172
4.9 Torsional Impact 177
*4,10 Bending of Thin Plates 179
4.11 Deflection of Plates by Integration 183
References 185
Problems 186
8.11 Design for Simple Fluctuating Loads 320
Design for Combined Fluctuating
Loads 327
10.6 Hydrodynamic Lubrication Theory 388
10.7 Design of Journal Bearings 391
10.8 Methods of Lubrication 397
10.9 Heat Balance of Journal
Bearings 399
10.10 Materials for Journal Bearings 400
Part B Rolling-Element Bearings 401
10.11 Types and Dimensions of Rolling
Bearings 402
10.12 Rolling Bearing Life 408
10.13 Equivalent Radial Load 409
10.14 Selection of Rolling Bearings 411
10.15 Materials and
, Lubricants of Rolling
Bearings 4l6
10.16 Mounting and Closure of Rolling
Bearings 417
References 418
Problems 419
mm
8.12
8.13 Prediction of Cumulative Fatigue
Damage 329
Fracture Mechanics Approach
to Fatigue 330
Surface Fatigue Failure: Wear 333
8.14
8.15
Chapter 7 References 335
FAILURE CRITERIA
AND RELIABILITY 265
7.1 Introduction 266
7.2 Introduction to Fracture Mechanics 266
7.3 Stress-Intensity Factors 267
7.4 Fracture Toughness 268
7.5 Yield and Fracture Criteria 273
7.6 Maximum Shear Stress Theory 275
7.7 Maximum Distortion Energy Theory 277
7.8 Octahedral Shear Stress Theory 279
7.9 Comparison of the Yielding Theories 282
7.10 Maximum Principal Stress Theory 283
7.11 Mohr’s Theory 284
7.12 The Coulomb-Mohr Theory 285
7.13 Reliability 288
7.14 Normal Distributions 289
7.15 The Reliability Method and Margin
of Safety 291
References 294
Problems 295
Problems 336
P A R T 2
APPLICATIONS 342
Chapter 9
SHAFTS AND ASSOCIATED PARTS 343
Chapter 5
ENERGY METHODS IN DESIGN 195
5.1 Introduction 196
5.2 Strain Energy 196
5.3 Components of Strain Energy . 198
5.4 Strain Energy in Common Members 199
5.5 The Work-Energy Method 203
5.6 Castigliano’s Theorem 204
5.7 Statically Indeterminate Problems 212
5.8 Virtual Work and Potential Energy 216
*5.9 Use of Trigonometric Series in Energy
Methods 217
*5.10 The Rayleigh-Ritz Method 220
References 222
Problems 223
9.1 Introduction 344
Materials Used for Shafting 345
Design of Shafts in Steady Torsion 345
Combined Static Loadings on Shafts 347
Design of Shafts for Fluctuating and Shock
Loads 348
Interference Fits 354
Critical Speed of Shafts 355
Mounting Parts 358
Stresses in Keys 361
Splines 362
Couplings 364
Universal Joints
9.3 Chapter 1 1
9.4 SPUR GEARS 423
Introduction 424
Geometry and Nomenclature 425
Fundamentals 428
Gear Tooth Action and Systems
of Gearing 430
Contact Ratio and Interference 433
Gear Trains 433
Transmitted Load 436
The Bending Strength of a Gear Tooth:
The Lewis Formula 440
Design for the Bending Strength
of a Gear Tooth: The AGMA Method 445
11.10 The Wear Strength of a Gear Tooth:
The Buckingham Formula 452
Design for the Wear Strength of a Gear
Tooth: The AGMA Method 455
11.12 Materials for Gears 459
11.13 Gear Manufacturing 460
References 465
Problems 466
References 369
Problems 370
Chapter 8 11.8
FATIGUE 301
8.1 Introduction 302
8.2 The Nature of Fatigue Failures 302
8.3 Fatigue Tests 304
8.4 The S-N Diagrams 305
8.5 Estimating the Endurance Limit
and Fatigue Strength 308
8.6 Modified Endurance Limit 309
8.7 Endurance Limit Reduction Factors 310
8.8 Fluctuating Stresses 316
8.9 Theories of Fatigue Failure 317
8.10 Comparison of the Fatigue Criteria 319
11.9
Chapter 1 0
BEARINGS AND LUBRICATION 376
Introduction 377
Part A Lubrication and Journal Bearings 377
Lubricants 377
Types of Journal Bearings
and Lubrication 378
Lubricant Viscosity 382
Petroff’s Bearing Equation 386
Chapter 6
BUCKLING DESIGN OF MEMBERS 232
10.1
6.1 Introduction 233
6.2 Buckling of Columns 233
6.3 Critical Stress in a Column 236
6.4 Initially Curved Columns 242
6.5 Eccentric Loads and
the Secant Formula 244
6.6 Design of Columns Under a Centric
Load
Chapter 1 4
SPRINGS 559
15.16 Welded Joints Subjected to Eccentric
Loading 641
Brazing and Soldering 646
Adhesive Bonding 647
Chapter 1 2
HELICAL, BEVEL, AND WORM GEARS 472
8 17.5 Properties of Two-Dimensional
Elements 730
Triangular Element 733
Plane Stress Case Studies 736
15.17 17.6
15.18
References 649
Introduction 560
Torsion Bars 561
Introduction 473 14.1
Helical Gears 473
Helical Gear Geometry 475
Helical Gear Tooth Loads 478
Helical Gear-Tooth Bending and Wear
Strengths 479
Bevel Gears 485
Tooth Loads of Straight Bevel Gears
Bevel Gear-Tooth Bending and Wear
Strengths 490
Worn Gearsets 492
Worm Gear Bending and Wear
Strengths 496
Thermal Capacity of Worm
Gearsets 498
References 745
Problems 746
Axisymmetric Element 742
Helical Tension and Compression
Springs 562
Spring Materials 566
Helical Compression Springs 570
Buckling of Helical Compression
Springs 572
Fatigue of Springs 574
Design of Helical Compression Springs for
Fatigue Loading 575
Helical Extension Springs 580
Torsion Springs 582
Leaf Springs 585
Miscellaneous Springs 588
12.3 14.3
Problems 650
 14.4 Chapter 1 6
AXISYMMETRIC PROBLEMS
IN DESIGN 659
14.5
12.6 14.6 A p p e n d i x A
UNITS, PROPERTIES OF SHAPES,
AND BEAM DEFLECTIONS 753
Table A.l Conversion factors: SI units to U.S.
customary units 754
SI prefixes 754
Properties of areas 755
Properties of some steel pipe and
tubing 756
Properties of solids 757
Properties of rolled-steel ( W ) shapes,
wide-flange sections 758
Table A.7 Properties of rolled-steel (S ) shapes,
American standard 1 beams 760
Table A,8 Properties of rolled-steel ( L) shapes,
angles with equal legs 762
Table A.9 Deflections and slopes of beams 764
Table A.10 Reactions and deflections of statically
indeterminate beams 766
12.7 488
16.1 Introduction 660
Basic Relations 660
Thick-Walled Cylinders Under
Pressure 661
Compound Cylinders: Press or Shrink
Fits 666
Disk Flywheels 669
Thermal Stresses in Cylinders 675
Fully Plastic Thick-Walled
Cylinders 679
Stresses in Curved Beams 682
Axisymmetrically Loaded Circular
Plates 689
Thin Shells of Revolution 692
Special Cases of Shells of
Revolution 694
Pressure Vessels and Piping 699
The ASME Code for Conventional
Pressure Vessels 702
Filament-Wound Pressure Vessels 703
Buckling of Cylindrical and Spherical
Shells 705
12.8 14.7
14.8 16.2
12.9 16.3
12.10 14,9
Table A.2
Table A.3
Table A.4
14.10 16.4
12.11 14.11
14.12 16,5
References 502 References 592 16.6
Problems 503 Table A.5
Table A.6
Problems 593 *16.7
Chapter 1 5
POWER SCREWS, FASTENERS,
AND CONNECTIONS 598
Chapter 1 3
BELTS, CHAINS, CLUTCHES,
AND BRAKES 507
13.1 Introduction 508
Part A Flexible Elements 508
13.2 Belts 509
13.3 Belt Drives 512
13.4 Belt Tension Relationships 516
13.5 Design of V-Belt Drives 518
13.6 Chain Drives 524
13.7 Common Chain Types 525
PartB High“Friction Devices 531
13.8 Materials for Brakes and Clutches 531
!3.9 Internal Expanding Drum Clutches
and Brakes 533
13.10 Disk Clutches and Brakes 534
13.11 Cone Clutches and Brakes 539
13.12 Band Brakes 541
13.13 Short-Shoe Drum Brakes 543
13.14 Long-Shoe Drum Brakes 546
13.15 Energy Absorption and Cooling 551
References 553
Problems
introduction 599
Standard Thread Forms 600
Mechanics of Power Screws 604
Overhauling and Efficiency of Power
Screws 608
Ball Screws 610
Threaded Fastener Types 612
Stresses in Screws 614
Bolt Tightening and Preload 617
Tension Joints Under Static
Loading 619
Gasketed Joints 621
Determining the Joint Stiffness
Constants 622
Tension Joints Under Dynamic
Loading 625
Riveted and Bolted Joints Loaded
in Shear 629
Shear of Rivets or Bolts Due to Eccentric
Loading 634
Welding
A p p e n d i x B
MATERIAL PROPERTIES 767
Table B.i
References 706
Problems 707
15.9 Average properties of common
engineering materials 768
Typical mechanical properties of gray
cast iron 770
Mechanical properties of some
hot-rolled (HR) and cold-drawn (CD)
steels 770
Mechanical properties of selected
heat-treated steels 771
Mechanical properties of some
annealed (An.) and cold-worked (CW)
wrought stainless steels 772
15.10 Table B.2
Chapter 1 7
15.11 FINITE ELEMENT ANALYSIS IN DESIGN 714
Table B.3
15.12 17.1 Introduction 715
Stiffness Matrix for Axial
Elements 716
Formulation of the Finite Element
Method and Its Application to
Trusses 720
Beam and Frame Elements 724
Figure C.7 Theoretical stress-concentration factor
Kf for a shaft with a shoulder fillet in
axial tension 111
Figure C.8 Theoretical stress-concentration factor
K{ for a shaft with a shoulder fillet in
torsion 778
Figure C.9 Theoretical stress-concentration factor
K( for a shaft with a shoulder fillet in
bending 778
Figure C.10 Theoretical stress-concentration factor
Kf for a grooved shaft in axial
tension 779
Figure C.l1 Theoretical stress-concentration factor
Kt for a grooved shaft in torsion 779
Figure C.12 Theoretical stress-concentration factor
Kt for a grooved shaft in bending 780
Figure C.l 3 Theoretical stress-concentration factor
Kf for a shaft with a transverse
hole in axial tension, bending,
and torsion 780
Table B.6 Mechanical properties of some
aluminium alloys 772
Table B.7 Mechanical properties of some copper
alloys 773
Table B.8 Selected mechanical properties of some
common plastics 773
A p p e n d i x C
STRESS CONCENTRATION FACTORS 774
Figure C. l Theoretical stress-concentration
factor Kt for a filleted bar in axial
tension 775
Figure C.2 Theoretical stress-concentration factor
Kt for a filleted bar in bending 775
Figure C.3 Theoretical stress-concentration factor
K{ for a notched bar in axial
tension 776
Figure C.4 Theoretical stress-concentration
factor Kf for a notched bar in
bending 776
Figure C.5 Theoretical stress-concentration factor
Kt: A— for a flat bar loaded in tension by
a pin through the transverse hole; 8— For
a flat bar with a transverse hole in axial
tension 111
Figure C.6 Theoretical-stress concentration factor
Kt for a fiat bar with a transverse hole in
bending 111
A p p e n d i x D
SOLUTION OF THE STRESS
CUBIC EQUATION 781
ANSWERS TO SELECTED PROBLEMS 783
Index 7 9 1
Chapter 9 Shafts and Associated Parts
Chapter 10 Bearings and Lubrications
Chapter 11 Spur Gears
Chapter 12 Helical, Bevel and Worm Gears
Chapter 13 Belts, Chains, Clutches and Brakes
Chapter 14 Springs
Chapter 15 Power Screws, Fasteners and Connections
Chapter 16 Axisymmetric Problems in Design
Chapter 17 Finite Element Analysis in Design 


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