Mechanical hysteresis
Principle
The relationship between torque and angle of rotation is determined when metal bars are twisted. The hysteresis curve is recorded.
Benefits
- Beyond Hooke’s law
- Hysteresis – mostly known from the field of magnetism – can be experienced in mechanics
- Learn the meaning of the words stress, relaxation and equilibrium in a physics context
- Various torsion rods out of different material and with several diameters included
Right angle boss-head clamp
Support base DEMO
Support rod, stainless steel, l = 250 mm, d = 10 mm
Support rod, stainless steel, 750 mm
Torsion apparatus
Torsion rod, steel, l = 500 mm, d = 2 mm
Torsion rod, Al, l = 500 mm, d = 2 mm
Torsion rod, Al, l = 400 mm, d = 2 mm
Torsion rod, Al, l = 300 mm, d = 2 mm
Torsion rod, Al, l = 500 mm, d = 3 mm
Torsion rod, Al, l = 500 mm, d = 4 mm
Torsion rod, brass, l = 500 mm, d = 2 mm
Torsion rod, Cu, l = 500 mm, d = 2 mm
Spring balance,transparent, 1 N
Spring balance,transparent, 2 N
Stopwatch, digital, 1/100 s
Right angle clamp expert
Tasks
- Record the hysteresis curve of steel and copper rods.
- Record the stress-relaxation curve with various relaxation times of different materials.
What you can learn about
- Mechanical hysteresis
- Elasticity
- Plasticity
- Relaxation
- Torsion modulus
- Plastic flow
- Torque
- Hooke’s law