# STRESS AND STRAIN

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## Contents

## SUB-MODULE UNIT: STRESS AND STRAIN

### THEORY

#### Specific Objectives

By the end of the sub-module unit, the trainee should be able to:

- define terms used in properties of materials
- calculation of stress and strain
- state Hooke’s law
- describe the stress – strain relationship

#### Content

- Definitions

- plasticity

- elasticity

- stress

- modulus of elasticity

- bulk modulus

- yield modulus

- Calculations

- stress

- strain

- Stating Hooke’s law
- Describing the stress-strain relationship
- Sketching the stress-strain graph
- Modulus of rigidity
- Working stress and ultimate stress
- Factor of safety

### PRACTICE

#### Specific Objectives

By the end of the sub-module unit, the trainee should be able to:

- Set the apparatus for stress, strain experiment
- Carry our experiment for stress and strain
- Carry out tensile test for ferrous metals
- Plot the stress strain graph
- Calculate stress and strain

## Content

- Apparatus
- Experiment for stress/strain
- Tabulate data
- Stress/strain graph

## Competences

Ability to:

- Carry our laboratory test on metals
- Compute stress/strain results
- Plot stress/strain graph
- Interpret the test results
- Calculate the stress/strain problems
- Sketch and table the stress strain graphs

#### Suggested Teaching/Learning activities

- Demonstration
- Class exercises

#### Suggested Learning Resources

- Laboratory
- Text books
- Actual metals

#### Suggested Assessment Methods

- Practical exercise
- Written
- Assignments