Mechanical Science for Technicians - 1st Edition - ISBN: 9780713134452, 9781483183282

Mechanical Science for Technicians

1st Edition

Volume 2

Authors: Ian McDonagh
eBook ISBN: 9781483183282
Imprint: Arnold
Published Date: 1st January 1982
Page Count: 234
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Mechanical Science for Technicians, Volume 2 introduces the basic principles of stress-and-strain analysis. The book is comprised of 10 chapters that cover various aspects of mechanical sciences. The text first details the principles of stress-and-strain analysis and then proceeds to tackling the second moments of area of beam sections. Next, the book discusses combined direct and bending stresses. Chapter 4 talks about shear force and bending moment, while Chapter 5 deals with the slope and deflection of beams. The next chapters cover belt friction, velocity diagrams, flywheels, and oscillations. The last chapter discusses balancing rotating masses. The text will be of great use to mechanical engineers and technicians. Professionals dealing with machineries will also benefit from the book.

Table of Contents



1 Principles of Stress-And-Strain Analysis

Classification of Materials

Relationship between Stress and Strain

Volumetric Strain

Relationship between Linear Strain and Volumetric Strain

Bulk Modulus of Elasticity

Relationship between The Elastic Constants E, G, Ky and V

Stresses in Thin-Walled Vessels

Effect of Internal Pressure on the Volume of Thin-Walled Vessels

Complementary Shear Stress

Shear Stress in Beams due to Bending

Complex Stress

Normal and Shear Stresses on Any Plane in an Element Subject to Normal Stresses Only

Normal and Shear Stresses on Any Plane in an Element Subject to Shear Stress Only

Normal and Shear Stresses on Any Plane in a General Two-Dimensional Stress System

Principal Planes and Principal Stresses

Mohr's Circle for Stress

Trigonometric Identities (Proof)

2 Second Moments of Area of Beam Sections

Second Moment of Area

'I' for Common Sections

The Parallel-Axis Theorem

3 Combined Direct and Bending Stresses

Direct Stress

Bending Stress

Values of I and ymax. for Common Sections

Combined Bending and Direct Stress

Core or 'Kern' of Section

The Position of the Neutral Axis

Worked Examples 4 Shear Force and Bending Moment


Shear Force

Bending Moment

Relationship between Loading, Shear Force, and Bending Moment

Application of the Mathematical Relationship between Shear Force and Bending Moment to Solution of Problems

5 Slope and Deflection of Beams


Elastic Equation for Bending

Sign Convention and Boundary Conditions

Applications of the Elastic Equation for Bending

Principle of Superposition

Macaulay's Method

6 Belt Friction

Power Transmission by Belt Drive

Ratio of Belt Tensions

Maximum Power Transmitted by a Belt

Vee-Belt Drives

Initial Tension in a Belt

7 Velocity Diagrams

Relative Velocities of Points on a Rigid Bar Rotating about One End

Relative Velocities of Points on a Rigid Bar Having Plane Motion

Relative Velocities of Points in a Slider-Crank Mechanism

Relative Velocities of Points in a Quadric Cycle Chain

Relative Velocities of Points in Combinations of Quadric Cycle Chains and Slider-Crank Mechanisms

Velocity Diagrams for Mechanisms Having Combined Sliding and Rotation

8 Flywheels and Turning-Moment Diagrams

Function of a Flywheel

The Energy in a Flywheel

Turning-Moment Diagrams

Coefficient of Fluctuation of Speed

Coefficient of Fluctuation of Energy

Fluctuation of Energy from Turning-Moment Diagrams

9 Oscillations

Periodic Time and Frequency

Displacement and Amplitude

Simple Harmonic Motion

Free Longitudinal Oscillations of a Mass on a Vertical Spring

Free Transverse Oscillation of a Mass on a Cantilever

Free Transverse Oscillation of a Single Mass on a Simply Supported Beam

Torsional Oscillations

Transverse Vibration of a Shaft Carrying a Uniformly Distributed Load Using the Energy or Rayleigh's Method

Transverse Vibration of a Beam Carrying Several Point Loads Using the Energy or Rayleigh's Method

Dunkerley's Method

Whirling of Shafts

Limiting Speeds

10 Balancing Rotating Masses

Static and Dynamic Balance

Balancing Masses Rotating in the Same Plane

Balancing of Masses Rotating in Different Planes

Dynamic Reactions at Bearings due to Out-of-Balance Forces



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© Arnold 1988
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About the Author

Ian McDonagh

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