# Material Mechanical Properties

This is a summary of the most important material mechanical properties

**Tensile Strength** -Is a measurement of the force required to pull something such as rope, wire, or a structural beam to the point where it breaks.

The tensile strength of a material is the maximum amount of tensile stress that it can take before failure, for example breaking.

There are three typical definitions of tensile strength:

**Yield strength**– The stress a material can withstand without permanent deformation. This is not a sharply defined point. Yield strength is the stress which will cause a permanent deformation of 0.2% of the original dimension.**Ultimate strength**– The maximum stress a material can withstand.**Breaking strength**– The stress coordinate on the stress-strain curve at the point of rupture.

**Young Modulus / Modulus of Elasticity** – relationship between stress (force per unit area) and strain (proportional deformation) in a material in the linear elasticity regime of a uniaxial deformation.

**Elongation at yield – **The stress corresponding to a specified permanent (plastic) deformation.

**Elongation at Break** – Elongation between zero stress and final rupture, as a percent of original specimen length. For example, a 1 meter specimen that stretches to 1.1 meters before breaking in two has 10% elongation at break. Also simply called elongation

**Ultimate elongation** -Is the percentage increase in length that occurs before it breaks under tension

**Flexural Modulus** – the flexural modulus or bending modulus [1] is an intensive property that is computed as the ratio of stress to strain in flexural deformation, or the tendency for a material to resist bending. It is determined from the slope of a stress-strain curve produced by a flexural test (such as the ASTM D790) and uses units of force per area.

**Flexural Yield strength** – Typically measured at 5% deformation/strain of the outer surface,

Sources:

https://www.quora.com/What-are-tensile-strength-units

http://www.matweb.com/reference/tensilestrength.aspx