Youngs Modulus

The modulus of elasticity for a variety of common materials

Description

The modulus of elasticity defines the relationship between uniformly distributed normal stress $\inline \sigma_x$ and the resulting normal strain $\inline \varepsilon_x$ , i.e

$E = \frac{\sigma_x}{\varepsilon_x}$

(1)

Typical values include:

Material	E (GPa)
Wood	11
Aluminium	69
Brass	103-124
Titanium	105-120
Iron	190-210
Tungsten	400-410
Silicon Carbide	450
Diamond	1050-1200

In structures the Young's modulus has importance in calculated the deflection or extension of beams due to applied loads, enabling an induced stress to be converted into a strain. As strain is defined as the (change of length)/(original length), then the movement of the structural member can be calculated.