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Fourth Edition

CHAPTER

MECHANICS OF
MATERIALS
Ferdinand P. Beer
E. Russell Johnston, Jr.
John T. DeWolf

Introduction –
Concept of Stress

Lecture Notes:
J. Walt Oler
Texas Tech University

© 2006 The McGraw-Hill Companies, Inc. All rights reserved.

Fourth
Edition

MECHANICS OF MATERIALS

Beer • Johnston • DeWolf

Contents
Concept of Stress

Bearing Stress in Connections

Review of Statics

Stress Analysis & Design Example

Structure Free-Body Diagram

Rod & Boom Normal Stresses

Component Free-Body Diagram

Pin Shearing Stresses

Method of Joints

Pin Bearing Stresses

Stress Analysis

Stress in Two Force Members

Design

Stress on an Oblique Plane

Axial Loading: Normal Stress

Maximum Stresses

Centric & Eccentric Loading

Stress Under General Loadings

Shearing Stress

State of Stress

Shearing Stress Examples

Factor of Safety

© 2006 The McGraw-Hill Companies, Inc. All rights reserved.

1- 2

Fourth
Edition

MECHANICS OF MATERIALS

Beer • Johnston • DeWolf

Concept of Stress
• The main objective of the study of the mechanics
of materials is to provide the future engineer with
the means of analyzing and designing various
machines and load bearing structures.
• Both the analysis and design of a given structure
involve the determination of stresses and
deformations. This chapter is devoted to the
concept of stress.

© 2006 The McGraw-Hill Companies, Inc. All rights reserved.

1- 3

Fourth
Edition

MECHANICS OF MATERIALS

Beer • Johnston • DeWolf

Review of Statics
• The structure is designed to
support a 30 kN load
• The structure consists of a
boom and rod joined by pins
(zero moment connections) at
the junctions and supports
• Perform a static analysis to
determine the internal force in
each structural member and the
reaction forces at the supports

© 2006 The McGraw-Hill Companies, Inc. All rights reserved.

1- 4

Fourth
Edition...