# Stress and Strain in Braking Systems

### Engineering Studies – P3 Braking Systems – Mechanical Analysis

This topic covers the definition and relevance of the engineering terms ‘stress’ and ‘strain’.
Methods of determining stress and strain values are described and the interpretation of the data explained.

## Key Concepts

• Tension and compression forces
• Types of stress
• Defining strain
• Load /extension and stress/strain graphs

## Discussion Questions

1. Define stress and list the common types of stress.
2. Explain the units used in stress values.
3. Explain the difference between a load/extension graph and a stress/strain graph.
4. Describe the procedure of the test being performed that creates a load/extension diagram.
5. Outline how material properties can be identified on the graph produced by a tensometer – strength, elasticity, ductility, toughness and stiffness.
6. Outline how a stress/strain graph varies for a range of engineering materials – ceramics, metals or polymers.

321 Stress Strain Fundamentals -DRv1.0 216 KB
Stress and Stain Discussion question responses - contributed by John Gibson
321 Stress and Strain -EQA v1.0 2 MB
Sample questions and answers - Stress and Strain
Solving Mechanical Calculations 165 KB
Resources contributes by Steve Cavanagh Head Teacher Technological and Applied Studies (TAS) EAST HILLS BOYS HIGH SCHOOL

## Videos

Stress and Strain Fundamentals - Mr David Jackson - Engineering Studies Teacher - 321 V1
Stress Stain Introduction - Mr David Jackson - Engineering Studies Teacher - 321 V3
Force Extension Introduction - Mr David Jackson - Engineering Studies Teacher - 321 V2
Reading a Force Extension Diagram -Example Question. Mr David Jackson - Engineering Studies Teacher - 321 V4
Stress and Strain - The Efficient Engineer - YouTube
Moment of Inertia - EXTENSION content. All students would benefit from the first chapter of this video. The ES syllabus states that the value of the second moment of area will be provided, not calculated. The Efficient Engineer
True Stress - the Efficient Engineer series