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Flashcards in Material definitions Deck (20):
1

Plastic

When deformed doesn't return to original position

2

Elastic

After deformation the material returns to its original position when the force is removed.

3

Viscous drag

The frictional force produced by a flowing fluid

4

Turbulent flow

Flow lines arent parallel, layers mixand contains eddies

5

Tensile strain + equation

Extension per unit length

Strain = extension/original length

6

Tensile stress

Forceper unit area
Nm-2
Stress =force / cross sectional area

7

Terminal velocity

The constant velocity reached when weight equals upthrust + drag

Forces in equilibrium

8

Ductile

Undergoes lots of plastic deformation under tensile force

9

Brittle

Shows little plastic deformation before breaking

10

Yield point

A large increase in strain is seen for a small increase in stress

11

Malleable

Undergoes lots of plastic deformation under compressive force

12

Upthrust

The upward force equal to the weight of fluid displaced.
Or the upward force due to fluid pressure

13

Elastic limit

Where it stops behaving elastically

14

Hard

Resistant to cutting , indentation and abrasion

15

Tough

Can absorb a lot of energy before it breaks

16

Laminar flow

A flow pattern where all the flow elements flow in the same direction

Streamlines run parallel

17

Young's modulus

Measure of stiffness
Units = Nm-2 =Pa

Young's modulus = stress / strain

18

Limit of proportionality

Stops obeying hooke's law
Stops being a straight line

19

Strong

High ultimate tensile stress

20

UTS (ultimate tensile stress)

the maximum stress that is applied to a wire without its snapping.