Unit 5 C2 Material Properties Key Terms

Question 1

Define the term ductile.

Answer 1

Ductile means the material may be drawn out into a wire as the atoms can slide over each other. It is deformed under tensile stress.

Question 2

Define fatigue.

Answer 2

This is progressive and structural damage of a material that can occur with relatively low levels of stress if there is repeated loading and unloading.

Question 3

Define brittle.

Answer 3

The material cannot be permanently stretched. It will break soon after the elastic limit.

Question 4

Define plastic deformation.

Answer 4

When the stress is removed, a change in an objects shape and size is permanent. It does not return to its original shape.

Question 5

Define creep.

Answer 5

Occurs when a solid material under constant stress moves slowly and deforms permanently over time.

Question 6

Define strength.

Answer 6

This is the maximum stress the material can bear. This occurs just before the material fractures and fails.

Question 7

Define elastic limit.

Answer 7

The point on the stress strain curve, beyond which a material begins to suffer plastic deformation, and so will not return to its original shape.

Question 8

Define malleable.

Answer 8

The ability of a material to be formed by drawing into new shapes, by compressive forces such rolling, hammering, or stamping.

Question 9

Define elasticity.

Answer 9

This is when a sample that has been deformed by a force returns to its original shape when the force causing the deformation is removed.