Modulus of Elasticity

(mechanics) The ratio of the increment of some specified form of stress to the increment of some specified form of strain, such as Young's modulus, the bulk modulus, or the shear modulus. Also known as coefficient of elasticity; elasticity modulus; elastic modulus.

(Young’s modulus) a measurement of elasticity obtained by dividing stress below the proportional limit by its corresponding strain value. A measure of stiffness.

In an elastic material which has been subject to strain below its elastic limit, the ratio of the unit stress to the corresponding unit strain.

The ratio of stress to strain for a body obeying Hooke's law. There are several moduli corresponding to different types of strain (see modulus of compression, modulus of rigidity, Young's modulus).

An imaginary stress necessary to stretch a piece of material to twice its length or compress it to half its length. Values for the individual species are given in megapascals (MPa - equivalent to N/m2), and are based on testing small clear pieces of dry wood.