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# Uses of Young's Modulus

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## Gemma Davis

on 19 January 2015

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#### Transcript of Uses of Young's Modulus

Uses of Young's Modulus
What is Young's Modulus?
Stress and Strain
Who uses Young's Modulus?
Engineers
Stress is the measure of force exerted on the object over the cross-sectional area of the material.
Strain, on the other hand, is the change in the length of the material over the original length.
Both of these two measurements are vital parts of Young's Modulus.
It is used by engineers to make sure their materials can withstand a sufficient amount of force for the product they are designing.
An example of this would be tests a structural engineer would run on the materials being used to build a bridge, ehich eventually leads to a weight limit being found which is specific to that bridge.
Physicists
The equation of Young's Modulus
Physicists would also use Young's Modulus to test materials and equipment to see how strong they are before using them in high pressure experiments.
Young's Modulus is used as a way of determining the stiffness of a substance.
It is found by dividing the stress of an object by the strain.
This is only spplicable though where Hooke's law applies.
Engineering
These are a couple of examples of where Young's Modulus is used in engineering.
All of these items require very high strength and therefore the use of Young's Modulus is essential.
Application - Guns
Poisson ratio
When an object is compressed in one direction, it expands in the other
Application of the calculations
Young's Modulus and Poisson ratio are used for gun barrel steel.

(the cartridges referenced are CDA 260 cartridge - brass)
Some more examples
Concrete
Concrete will fail without any warning so if the limit is broken the whole structure collapses.
But steel has a reduction in stress so you can tell when it is about to collapse, meaning action can be taken, such as evacuating.
Diamond
Our aim:
Diamond is the stiffest material because of its full covalent bonding but the high price means its not used for engineering applications.
Explain how Young's Modulus is used in the working world of engineers and physics
Even more examples
Polymers
Polymers aren't a good choice for stiff, cheap products - but they can be reinforced by incorporating stiffeners into the design
Polyethene
Polyethene has a wide range for Young's Modulus because the 'bubble' on a Young's Modulus-time graph includes both LDPE and HDPE
Full transcript