Modulus of elasticity

Principle

A flat bar is supported at two points. It is bent by the action of a force acting at its centre. The modulus of elasticity is determined from the bending and the geometric data of the bar.

Benefits

• Find out the parameters that give a bar stability
• Measure the difference of elasticity in various metals with different lengths
• Learn how to determine forces with a dial gauge

Tasks

1. Determination of the characteristic curve of the dial gauge.
2. Determination of the bending of flatbars as a function of the force; at constant force: of the thickness, of the width and of the distance between the support points.
3. Determination of the modulus of elasticity of steel, aluminium and brass.

Learning objectives

• Young's modulus
• Modulus of elasticity
• Stress
• Deformation
• Poisson's ratio
• Hooke's law