INSTRUCTOR’S SOLUTIONS MANUAL
to accompany
Mechanical
[EDITOR: THIS IS BLANK PAGE, BACK OF FRONT COVER]
[to be produced by publisher]
Engineering
Design
THIRD EDITION
ANSEL C. UGURAL
CRC Press
Taylor & Francis Group
[EDITOR: THIS IS THE TITLE PAGE]
i
, CONTENTS
Part I FUNDAMENTALS
Chapter 1 INTRODUCTION 1
Chapter 2 MATERIALS 15
Chapter 3 STRESS AND STRAIN 23
Chapter 4 DEFLECTION AND IMPACT 44
Chapter 5 ENERGY METHODS AND STABILITY 59
Part II FAILURE PREVENTION
Chapter 6 STATIC FAILURE CRITERIA AND RELIABILITY 85
Chapter 7 FATIGUE FAILURE CRITERIA 101
Chapter 8 SURFACE FAILURE 119
Part III MACHINE COMPONENT DESIGN
Chapter 9 SHAFTS AND ASSOCIATED PARTS 129
Chapter 10 BEARINGS AND LUBRICATION 148
Chapter 11 SPUR GEARS 160
Chapter 12 HELICAL, BEVEL, AND WORM GEARS 178
Chapter 13 BELTS, CHAINS, CLUTCHES, AND BRAKES 192
Chapter 14 SPRINGS 209
Chapter 15 POWER SCREWS, FASTENERS, AND CONNECTIONS 224
Chapter 16 MISCELLANEOUS MECHANICAL COMPONENTS 245
Chapter 17 FINITE ELEMENT ANALYSIS IN DESIGN 258
Chapter 18 CASE STUDIES IN MACHINE DESIGN 288
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, DESCRIPTION OF THE MATERIAL CONTAINED IN
“Mechanical Engineering Design”
Chapter 1 attempts to present the basic concepts and an overview of the subject. Sections 1.1 through 1.7
discuss the scope of treatment, machine and mechanical design, problem formulation, factor of safety, and
units. The load analysis is normally the critical step in designing any machine or structural member (Secs.
1.8 through 1.10). The determination of loads is encountered repeatedly in subsequent chapters. Case
studies provide a number of machine or component projects throughout the book. These show that the
members must function in combination to produce a useful device. Section 1.11 reviews the work, energy,
and power. The foregoing basic considerations need to be understood in order to appreciate the loading
applied to a member. The last two sections emphasize the fact that stress and strain are concepts of great
importance to a comprehension of design analysis.
Chapter 2 reviews the general properties of materials and some processes to improve the strength
of metals. Sections 2.3 through 2.14 introduce stress-strain relationships, material behavior under various
loads, modulus of resilience and toughness, and hardness, selecting materials. Since students have
previously taken materials courses, little time can be justified in covering this chapter. Much of the
material included in Chapters 3 through 5 is also a review for students. Of particular significance are the
Mohr’s circle representation of state of stress, a clear understanding of the three-dimensional aspects of
stress, influence of impact force on stress and deformation within a component, applications of
Castigliano’s theorem, energy of distortion, and Euler’s formula. Stress concentration is introduced in
here, but little applications made of it until studying fatigue (Chap.7).
The first section of Chapter 6 attempts to provide an overview of the broad subject of “failure”,
against which all machine/mechanical elements must be designed. The discipline of fracture mechanics is
introduced in Secs. 6.2 through 6.4. Yield and fracture criteria for static failure are discussed in Secs. 6.4
through 6.12. The last 3 sections deal with the method of reliability prediction in design. Chapter 7 is
devoted to the fatigue and behavior of materials under repeated loadings. The emphasis is on the Goodman
failure criterion. Surface failure is discussed in Chapter 8. Sections 8.1 through 8.3 briefly review the
corrosion and friction. Following these the surface wear is discussed. Sections 8.6 through 8.10 deal with
the surfaces contact stresses and the surface fatigue failure and its prevention. The background provided
here is directly applied to representative common machine elements in later chapters.
Sections 9.1 through 9.4 of Chapter 9 treat the stresses and design of shafts under static loads.
Emphasis is on design of shafts for fluctuating loading (Secs. 9.6 and 9.7). The last 5 sections introduce
common parts associated with shafting. Chapter 10 introduces the lubrication as well as both journal and
roller bearings. As pointed out in Sec. 8.9, rolling element bearings provide interesting applications of
contact stress and fatigue. Much of the material covered in Secs. 11.1 through 11.7 of Chapter 11
introduce nomenclature, tooth systems, and fundamentals of general gearing. Gear trains and spur gear
force analysis are taken up in Secs. 11.6 and 11.7. The remaining sections concern with gear design,
material, and manufacture. Non-spur gearing is considered in Chapter 12. Spur gears are merely a special
case of helical gears (Secs. 12.2 through 12.5) having zero helix angle. Sections 12.6 through 12.8 deal
with bevel gears. Worm gears are fundamentally different from other gears, but have much in common
with power screws to be taken up in Chap. 15.
Chapter 13 is devoted to the design of belts, chains, clutches, and brakes. Only a few different
analyses are needed, with surface forms effecting the equations more than the functions of these devices.
Belts, clutches, and brakes are machine elements depending upon friction for their function. Design of
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, various springs is considered in Chapter 14. The emphasis is on helical coil springs (Secs. 14.3 through
14.9) that provide good illustrations of the static load analysis and torsional fatigue loading. Leaf springs
(Sec. 14.11) illustrate primarily bending fatigue loading. Chapter 15 attempts to present screws and
connections. Of particular importance is the load analysis of power screws and a clear understanding of the
fatigue stresses in threaded fasteners. There are alternatives to threaded fasteners and riveted or welded
joints. Modern adhesives (Secs. 15.17 and 15.18) can change traditional preferred choices.
It is important to assign at least portions of the analysis and design of miscellaneous mechanical
members treated in Chapter 16. Sections 16.3 through 16.7 concern with thick-walled cylinders, press or
shrink fits, and disk flywheels. The remaining sections concerns with the bending of curved frames and
pressure vessels. Chapter 17 represents an addition to the material traditionally covered in
“Machine/Mechanical Design” textbooks. It attempts to provide an introduction to the finite element
analysis in design. Some practical case studies illustrate solutions of problems involving structural
assemblies, deflection of beams, and stress concentration factors in plates. Finally, case studies in
preliminary design of the entire crane with winch and a high-speed cutting machine are introduced in
Chapter 18.
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