Hysterisis

Question 1

What is the hysterisis?

Answer 1

The difference of the work done per unit m^3 between the loading and unloading line

Question 2

What is a hysteresis loop?

Answer 2

area enclosed by the loading and unloading curves

Question 3

What does the hysteresis loop represent for a stress strain graph?

Answer 3

the amount of energy per unit volume transferred to the internal energy during the load and unload cycle

Question 4

What proves that energy is transferred to the thermal energy store?

Answer 4

if we repeatedly stretch and relax a rubber band it becomes very hot

Question 5

What does a hysteresis loop represent for a force extension graph?

Answer 5

the total energy transferred to the internal (thermal) energy store of the rubber band

Question 6

good definition?

Answer 6

The stress–strain graph for rubber (below) shows that the behaviour as a load is removed is not the same as that when the load is being increased. This is called hysteresis and the curves are said to make a hysteresis loop.