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What properties do brittle materials have?
- They don't deform plastically and they can be quite weak when they have cracks in them
What happens to a brittle material when the force increases up to a certain point?

It will suddenly snap
Why are ductile materials used for wiring?

Because they can keep their strength when they're deformed
What other properties do ductile materials have?

They can change thier shape
What's the difference between malleable properties and ductile properties?

Malleable like ductile can change thier shape, however they can lose their strength.
What are the three main properties for hard materials?

Hard materials are resistant to cutting, indention and abrasion.
What do stiff materials have resistance against?

Stiff materials are resistant to bending and stretching
What is stiffness measured by? Also if the value is high what does this mean?

Young modulus. The higher the value the stiffer the material.
Why are tough materials difficult to break?

Tough materials absorb a lot of energy making it harder to break.
Give three examples of a brittle material?

Cermaics, glass and pottery
Give three examples of a ductile material?

Any cable e.g. copper steel etc.
What kind of material is gold?

A malleable metal
Define the elastic limit?

The elastic point is when a material starts to behave plastically. The material will no longer returnt to its original shape.
Define Hooke's Law?

Force is directly proportional to extention.
What is the formula for Youngs Modulus?

stress/strain.
What is the fomula for strain?

extension/length
What is the measurement for strain?

Trick question: There are no units for strain
What are the units for Young Modulus?

Nm-2 or Pascals
What is the yield point?

Where the material starts to stretch without any extra load

Author

McAuley

174685

Card Set

mami and lauren flash cards

Description

stress, strain ,young modulus ,materials

Updated

2012-10-01T14:29:18Z

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