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

  1. Record the hysteresis curve of steel and copper rods.
  2. 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

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Product number

P2120300

Mechanical hysteresis

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Reference