This book provides comprehensive coverage of the key topics in strength of materials–with an emphasis on applications, problem solving, and design of structural members, mechanical devices and systems. It includes coverage of the latest tools, trends and analysis techniques, and makes great use of example problems. Chapter topics include basic concepts; design properties of materials; design of members under direct stress; axial deformation and thermal stresses; torsional shear stress and torsional deformation; shearing forces and bending moments in beams; centroids and moments of inertia of areas; stress due to bending; shearing stresses in beams; special cases of combined stresses; the general case of combined stress and Mohr's circle; beam deflections; statically indeterminate beams; columns; and pressure vessels. For practicing mechanical designers and engineers.

This text covers key topics in strength of materials, focusing on applications, problem solving, and design of structural members, mechanical devices, and systems. Features of the text include an extensive introduction to composite materials along with commentary throughout on the application of composites to various kinds of load- carrying members, guidelines for the design of mechanical devices and structural members, and computer programming assignments with recommended uses for spreadsheets, MATLAB, and graphing calculators. This fourth edition contains a new appendix on statics, and a new chapter-opening section on the context in which the principles discussed in the chapter are used in real-world practice. Mott is affiliated with the University of Dayton.
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Prof. Robert L. Mott, P.E.

Professor Emeritus

The University of Dayton 

 

Teaching Interests:

Design of Machine Elements

Fluid Mechanics

Mechanical Engineering Design

Strength of Materials

Stress Analysis

Systems Design

 

Education:

B.S. Mechanical Engineering, General Motors Institute, 1963

M.S. Mechanical Engineering, Purdue University, 1965

 

Industrial Experience:

• General Motors Corporation,   Frigidaire Division, Research Engineer
• University of Dayton Research Institute, Engineer, Structural Mechanics Section
• Consulting in mechanical design and accident analysis  

Professional Interests:

• American Society of Mechanical Engineers (ASME)
• Past Chair, Manufacturing Education and Research Community
• Society of Manufacturing Engineers (SME)
• American Society for Engineering Education (ASEE)
  • Engineering Technology Council
  • Engineering Technology Division
• Registered Professional Engineer
• National Center for Manufacturing Education, Dayton, Ohio

Recent Books Published:

 

APPLIED STRENGTH OF MATERIALS, 5th ED, Prentice Hall, Publishing Co., 2008

APPLIED FLUID MECHANICS, 6th ED, Prentice Hall Publishing Co., 2006

MACHINE ELEMENTS IN MECHANICAL DESIGN, 4th ED, Prentice Hall Publishing Co., 2004

 

Honors and Awards:

• ASEE Fellow Member, 2007
• James H. McGraw Award for Outstanding Service in Engineering Technology Education, ASEE, 2004
• Archie Higdon Distinguished Mechanics Educator Awards, ASEE, 2001
• Frederick J. Berger Award for Excellence in Engineering Technology Education, ASEE, 1994
• Outstanding Engineer and Scientist Award, Dayton, Ohio, 1992
• Faculty Award in Teaching, University of Dayton, 1981
• Epsilon Delta Tau Outstanding Achievement Award, 1972
• Recipient of SAE Teetor Educational Award 1968
• Pi Tau Sigma National Mechanical Engineering Honorary
• Honorary Member Tau Alpha Pi Honor Society

 

Preface

1          Basic Concepts in Strength of Materials

The Big Picture

1-1       Objective of This Book — To Ensure Safety

1-2       Objectives of This Chapter

1-3       Problem-solving Procedure

1-4       Basic Unit Systems

1-5       Relationship Among Mass, Force, and Weight

1-6       The Concept of Stress

1-7       Direct Normal Stress

1-8       Stress Elements for Direct Normal Stresses

1-9       The Concept of Strain

1-10     Direct Shear Stress

1-11     Stress Element for Shear Stresses

1-12     Preferred Sizes and Standard Shapes

1-13     Experimental and Computational Stress

 

2          Design Properties of Materials

The Big Picture

2-1       Objectives of This Chapter

2-2       Design Properties of Materials

2-3       Steel

2-4       Cast Iron

2-5       Aluminum

2-6       Copper, Brass, and Bronze

2-7       Zinc, Magnesium, Titanium, and Nickel-Based Alloys

2-8       Nonmetals in Engineering Design

2-9       Wood

2-10     Concrete

2-11     Plastics

2-12     Composites

2-13     Materials Selection

3          Direct Stress, Deformation, and Design

The Big Picture and Activity

3-1       Objectives of this Chapter

3-2       Design of Members under Direct Tension or Compression

3-3       Design Normal Stresses

3-4       Design Factor

3-5       Design Approaches and Guidelines for Design Factors

3-6       Methods of Computing Design Stress

3-7       Elastic Deformation in Tension and Compression Members

3-8       Deformation Due to Temperature Changes

3-9       Thermal Stress

3-10     Members Made of More Than One Material

3-11     Stress Concentration Factors for Direct Axial Stresses

3-12     Bearing Stress

3-13     Design Bearing Stress

3-14     Design Shear Stress

 4        Torsional Shear Stress and Torsional Deformation

The Big Picture

4-1       Objectives of This Chapter

4-2       Torque, Power, and Rotational Speed

4-3       Torsional Shear Stress in Members with Circular Cross Sections

4-4       Development of the Torsional Shear Stress Formula

4-5       Polar Moment of Inertia for Solid Circular Bars

4-6       Torsional Shear Stress and Polar Moment of Inertia for Hollow Circular Bars

4-7       Design of Circular Members under Torsion

4-8       Comparison of Solid and Hollow Circular Members

4-9       Stress Concentrations in Torsionally Loaded Members

4-10     Twisting — Elastic Torsional Deformation

4-11     Torsion in Noncircular Sections

5        Shearing Forces and Bending Moments in Beams

The Big Picture

5-1       Objectives of this Chapter

5-2       Beam Loading, Supports, and Types of Beams

5-3       Reactions at Supports

5-4       Shearing Forces and Bending Moments for Concentrated Loads

5-5       Guidelines for Drawing Beam Diagrams for Concentrated Loads

5-6       Shearing Forces and Bending Moments for Distributed Loads

5-7       General Shapes Found in Bending Moment Diagrams

5-8       Shearing Forces and Bending Moments for Cantilever Beams

5-9       Beams with Linearly Varying Distributed Loads

5-10     Free-Body Diagrams of Parts of Structures

5-11     Mathematical Analysis of Beam Diagrams

5-12     Continuous Beams — Theorem of Three Moments

6        Centroids and Moments of Inertia of Areas

 

The Big Picture

6-1       Objectives of This Chapter

6-2       The Concept of Centroid — Simple Shapes

6-3       Centroid of Complex Shapes

6-4       The Concept of Moment of Inertia

6-5       Moment of Inertia for Composite Shapes Whose Parts have the Same Centroidal Axis

6-6      Moment of Inertia for Composite Shapes — General Case — Use of the Parallel Axis Theorem

6-7       Mathematical Definition of Moment of Inertia

6-8       Composite Sections Made from Commercially Available Shapes

6-9       Moment of Inertia for Shapes with all Rectangular Parts

6-10     Radius of Gyration

6-11     Section Modulus

7        Stress Due to Bending

The Big Picture

7-1       Objectives of This Chapter

7-2       The Flexure Formula

7-3       Conditions on the Use of the Flexure Formula

7-4       Stress Distribution on a Cross Section of a Beam

7-5       Derivation of the Flexure Formula

7-6       Applications — Beam Analysis

7-7       Applications — Beam Design and Design Stresses

7-8       Section Modulus and Design Procedures

7-9       Stress Concentrations

7-10     Flexural Center or Shear Center

7-11     Preferred Shapes for Beam Cross Sections

7-12     Design of Beams to be Made from Composite Materials

 8        Shearing Stresses in Beams

The Big Picture

8-1       Objectives of this Chapter

8-2       Importance of Shearing Stresses in Beams

8-3       The General Shear Formula

8-4       Distribution of Shearing Stress in Beams

8-5       Development of the General Shear Formula

8-6       Special Shear Formulas

8-7       Design for Shear

8-8       Shear Flow

 9        Deflection of Beams

The Big Picture

9-1       Objectives of this Chapter

9-2       The Need for Considering Beam Deflections

9-3       General Principles and Definitions of Terms

9-4       Beam Deflections Using the Formula Method

9-5       Comparison of the Manner of Support for Beams

9-6       Superposition Using Deflection Formulas

9-7       Successive Integration Method

9-8       Moment-Area Method

 10      Combined Stresses

The Big Picture

10-1     Objectives of this Chapter

10-2     The Stress Element

10-3     Stress Distribution Created by Basic Stresses

10-4     Creating the Initial Stress Element

10-5     Combined Normal Stresses

10-6     Combined Normal and Shear Stresses

10-7     Equations for Stresses in Any Direction

10-8     Maximum Stresses

10-9     Mohr’s Circle for Stress

10-10   Stress Condition on Selected Planes

10-11   Special Case in which Both Principal Stresses have the Same Sign

10-12   Use of Strain-Gage Rosettes to Determine Principal Stresses

 11 Columns

The Big Picture

11-1     Objectives of this Chapter

11-2     Slenderness Ratio

11-3     Transition Slenderness Ratio

11-4     The Euler Formula for Long Columns

11-5     The J. B. Johnson Formula for Short Columns

11-6     Summary — Buckling Formulas

11-7     Design Factors and Allowable Load

11-8     Summary — Method of Analyzing Columns

11-9     Column Analysis Spreadsheet

11-10   Efficient Shapes for Columns

11-11   Specifications of the AISC

11-12   Specifications of the Aluminum Association

11-13   Non-Centrally Loaded Columns

12      Pressure Vessels

The Big Picture

12-1     Objectives of this Chapter

12-2     Distinction Between Thin-Walled and Thick-Walled Pressure Vessels

12-3     Thin-Walled Spheres

12-4     Thin-Walled Cylinders

12-5     Thick-Walled Cylinders and Spheres

12-6     Analysis and Design Procedures for Pressure Vessels

12-7     Spreadsheet Aid for Analyzing Thick-Walled Spheres and Cylinders

12-8     Shearing Stress in Cylinders and Spheres

12-9     Other Design Considerations for Pressure Vessels

12-10   Composite Pressure Vessels

 13 Connections

The Big Picture

13-1     Objectives of this Chapter

13-2     Modes of Failure

13-3     Riveted Connections

13-4     Bolted Connections

13-5     Allowable Stresses for Riveted and Bolted Connections

13-6     Example Problems — Riveted and Bolted Joints

13-7     Eccentrically Loaded Riveted and Bolted Joints

13-8     Welded Joints with Concentric Loads

 Appendix Answers to Selected Problems Index