Torsional Yield Strength

Definition - What does Torsional Yield Strength mean?

Torsional Yield strength is the amount of twisting or rotating force that a pipe can withstand before twisting off. Sometimes this Torsional Yield Strength is also referred to as Torsional Strength and can be defined as the maximum amount of torsional stress that a body can withstand before its failure. This type of stress is generally applicable on rotating shafts in mechanical equipment.

Petropedia explains Torsional Yield Strength

The strength of structures of equal cross-sectional area loaded in tension is independent of the shape of the cross section. Materials loaded in tension are susceptible to stress concentrations such as material defects or abrupt changes in geometry. However, materials exhibiting ductile behavior (most metals for example) can tolerate some defects, while brittle materials (such as ceramics) can fail well below their ultimate material strength.

Torsional Yield Strength is the stress state causing material to twist or rotate which it can withstand before any twisting failure.

The formula for computing the Torsional yield strength in a rod is:

Torsional strength = rotational force / cross sectional area

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