Ultimate Strength

Maximum stress at point of rupture.

Normally, changes in area due to changing load and necking are disregarded in determining ultimate strength. Therefore, it is normal to account for the effect of area by dividing the breaking load by the cross-sectional area.

The Ultimate Tensile Stress is given by:

Where

σf = ultimate tensile stress [Nm-2]
Pf = load at fracture [N]
A0 = original cross-sectional area [m2]

See also: Strength, Ultimate Load, Working Stress.

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Subjects: Mechanical Engineering