Stress -Strain Curve
Chapter Name : Mechanical Properties Of Solids |
Sub Topic Code : 101_11_09_05_01 |
Topic Name : Stress -Strain Curve |
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Sub Topic Name : Stress -Strain Curve |
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Introduction
Stress is a physical quantity that expresses the internal forces that neighboring particles of a continuous material exert on each other.
Pre-Requisites:
Stress
Activity:
Spring.
Real Life Question:
What is strain?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Strain | Strain means relative change in shape or size implies that it is dimensionless and has no units. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Young's modulus | The tensile modulus or elastic modulus, is a measure of the stiffness of an elastic material and is a quantity used to characterize materials. |
Real life uses :
Spring.
Places to visit :
Physics laboratory.
Practical examples around us
| Examples | Explainations |
|---|---|
| Bending of iron rod. | The ratio of the stress along an axis over the strain along that axis in the range of stress in which Hooke's law holds. |
What you learn in Theory:
Stress–strain curves of various materials vary widely, and different tensile tests conducted on the same material yield different results, depending upon the temperature of the specimen and the speed of the loading.
What you learn in Practice:
The bar is under tension, and is experiencing a stress that we define to be the ratio of the force to the cross sectional area.