# Engineering mechanics: solids

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30 Οκτ 2013 (πριν από 4 χρόνια και 7 μήνες)

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Engineering mechanics: solids

Introduction and contents

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Engineering mechanics: solids

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About this course

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Course materials
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Block 1 Geometry of Mechanisms

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Block 2 Statics

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Block 3 Kinematics: Motion/ Velocity diagrams

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Block 4 Dynamics

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Block 5 Acceleration
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Block 6 Structures

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Block 7 Energy and momentum

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Block 8 Vibration

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Block 9 Design and Study
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Do this

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Try this

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Acknowledgements

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Introduction and contents

The materials listed below are presented on the

following pages of this unit in pdf
format.

Block 1: Geometry of mechanisms

Unit 1: Mechanisms

Unit 2: Mechanisms 2

Block 2: Statics

Unit 3: Forced and moments

Unit 4: Modelling with free
-
body diagrams

Block 3: Kinematics

Unit 5: Motion

Unit 6: Velocity diagrams

Block 4: Dynamics

Unit 7/8: Dynamics

Block 5: Acceleration

Unit 9A: Compensation forces

Unit 9B: Acceleration diagrams

Block 6: Structures

Unit 10: Stress analysis

Unit 11: Structural components

Block 7: Energy and
momentum

Unit 12/13: Energy and momentum

Block 8: Vibration

Unit 14: Vibration

Block 9: Design study

3

Unit 15: The mechanics of an electric lift

Learning outcomes

This material is taken from a discontinued Open University course. It is
intended f
or re
-
purposing and re
-
use by educators rather than for use directly
by learners. Learning outcomes appropriate to the original course may be
provided within the material, but it is intended that educators will construct
new learning outcomes appropriate t
o the re
-
use they make of this material.

Engineering mechanics: solids

About this course

This course introduces the subject areas of Kinematics, Statics and Dynamics, in
the context of Engineering Mechanics. The course is mainly concerned with the
applicat
ion of these topics to the analysis and design of solid bodies, as distinct
from the closely related areas of Fluid Mechanics and Thermodynamics.

Kinematics is the study of motion. Statics is the study of forces on stationary
objects. Dynamics is the study

of forces on moving bodies. These are the analytical
tools used by the design engineer.

The aims of the course are therefore two fold. Firstly, it aims to teach the basic
analytical methods, that is, the fundamental concepts and techniques of solid
engine
ering mechanics. Secondly, it aims, in a limited way, to show the
implementation of these methods in engineering design. The limited time available
to study the course has meant that the Course Team have had to lay the emphasis
on the analytical methods. T
he underlying assumption has been that, if students
acquired a solid foundation in analysis from this course, then its implementation in
design would become apparent both in future courses and in the mechanical
engineering that surrounds them every day.

Su
ggested study hours

135

Format

pdf for 9 books

Where is this from?

These materials comprise the core teaching text of T235, which is an introductory
course to mechanical/aeronautical/materials engineering. Engineering mechanics:
solids was last presented i
n 2003.

What is included?

On the basis that ‘it is better to do a few things well’ the Course Team adopted a
policy of simplification of course components. Their watchword was ‘if in doubt,
leave it out’. The course as a whole, thus, comprised:

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nine blocks

covering fifteen unit texts, some bound in pairs;

supplementary notes with assignments;

eight television programmes;

audio
-
cassettes;

residential school;

Each unit contains its own set of aims and learning outcomes.

The course does not include: supplemen
tary notes, television programmes, audio
-
cassettes, residential school.

A note on answers

In breaking this course down to the unit level in order to provide pdfs with a
manageable file size we have separated some self
-
assessment questions and
exercises fro
m their back
-
of
-
the
-
book answers. In order to locate these answers,
return to the page containing the links to the pdfs and select the final 'view
document' link on the page. The answers will be found towards the end of this file.

Course materials

Block 1
Geometry of Mechanisms

Unit 1 Mechanisms 1; Unit 2 Mechanisms 2
-

these units introduce some simple
mechanisms and show how combinations of mechanisms are use to form complex
machines. The fundamental concepts of motion, such as position, velocity,
acceler
ation and jerk, are explained along with the idea of scalar and vector
quantities. Methods are given for the analysis of machines.

Unit 1 Mechanisms 1

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Unit 2 Mechanisms 2

5

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le

Block 2 Statics

Unit 3 Forced and moments

-

this unit introduces the ideas of forces, moments
and strength, and employs these quantities in static analysis

the analysis of forces
and moments on stationary bodies. The unit also teaches about Newton’s l
aws of
motion and, in particular, the application of Newton’s first law to statics problems.

Unit 4 Modelling with free
-
body diagrams

-

this unit is devoted to explaining
how to select free bodies in static analysis and how to draw the related free
-
body
di
agrams. A procedure for using free
-
body diagrams to solve statics problems is set
out.

Unit 3 Forced and moments

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Unit 4 Modelling with fr
ee
-
body diagrams

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cument' below to open file (3.0 MB).

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Block 3 Kinematics: Motion/ Velocity diagrams

Unit 5 Motion

-

introduces methods of representing and analysing motion in
mechanisms: the kinematics of mechanisms.

Unit 6 Velocity diagrams

-

exten
ds the kinematic explanation and analysis of Unit
5 to the construction of velocity diagrams for mechanisms and for components of
mechanisms.

Unit 5 Motion

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Unit 6 Velocity diagrams

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Block 4 Dynamics

Units 7/8 Dynamics

-

these are used to introduce the fundamentals of dynamic

analysis

the analysis of forces (and moments) on moving bodie3s

using
Newton’s laws of motion, especially the second and third laws. Procedures are
presented for dynamic analysis of both particles and rigid bodies, where appropriate
in both translatio
nal and rotational motion. The analysis concerns the relationships
between acceleration (including angular acceleration) and the forces and moments
applied to a rigid body.

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8

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Block 5 Acceleration

Unit 9 is concerned with two topics, namely compensation forces, centrifugal force,
for example, in analysis relative to m
oving axes, and the construction of
acceleration diagrams for simple mechanisms.

Unit 9A Compensation forces

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Acceleration diagrams

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Block 6 Structures

Unit 10
Stress analysis

-

explains the concepts of stress and

strain and the use of
stress analysis to predict the performance of components.

Unit 11 Structural components

-

introduces simple structural components, such
as ties, beams and struts, together with the static analysis of such components under
load.

Stres
s analysis

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Structural components

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Block 7 Energy and momentum

Units 12/13 Energy and momentum

-

these units introduces the ideas of work,
energy, power, momentum and impulse, and present procedures for using these
concepts in dynamic analysis.

Units 12/13 Energy and moment
um

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10

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Block 8 Vibration

Unit 14 Vibration

-

explains the basic co
ncepts of free and forced vibration for
simple spring
-
mass systems (with or without damping), including natural
frequency, amplitude, phase and resonance. The principles of vibration isolation are
also illustrated.

Unit 14 Vibration

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Block 9 Design and Study

Unit 15 The mechanics of an electric lift

-

this unit is a case study, based on the
mechanical design of an electric lift, intended to

show the application of many of

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the concepts and procedures which are given in the preceding Units to a practical
engineering design.

Unit 15 The mechanics of an electric lift

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Acknowledgements

This material is taken from The Open University's OpenLearn website. OpenLearn
pro
vides free open educational resources for learners and educators around the
world under a Creative Commons licence. Third party materials have been removed
but for ease of use the original acknowledgements copy has been included. For the

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online version of
this unit and for other free educational resources across a range of
topics, please go to http://www.open.ac.uk/openlearn/home.php.