Principle

Bars of various materials will be exciting into torsional vibration. The relationship between the vibration period and the geometrical dimensions of the bars will be derived and the specific shear modulus for the material determined.

Benefits


The use of eight different rods out of different material and with several diameters increase the understanding of all correlations

Simple experimental set-up with immediate and clear results

Extremely solid construction


Tasks


Static determination of the torsion modulus of a bar.

Determination of the moment of inertia of the rod and weights fixed to the bar, from the vibration period.

Determination of the dependence of the vibration period on the length and thickness of the bars.

Determination of the shear modulus of steel, copper, aluminium and brass.


What you can learn about


Shear modulus

Angular velocity

Torque

Moment of inertia

Angular restoring torque

G-modulus

Modulus of elasticity