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Ultimate Tensile Stress (UTS)

Last updated: March 19, 2019

What Does Ultimate Tensile Stress (UTS) Mean?

Ultimate tensile stress (UTS) refers to the maximum stress that a given material can withstand under an applied force. Metals that experience stress beyond the UTS value are more likely to exhibit traits of stress corrosion cracking.

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Corrosionpedia Explains Ultimate Tensile Stress (UTS)

It is important to regulate the rate of UTS in metals that are deemed suitable for a given application. This permits corrosion engineers to better determine the rate of stress corrosion cracking (SCC) present, which is important because there is a direct correlation between SCC and the lifespan of a metal.

SCC refers to the progressive fracturing that occurs in metals as a result of the combined effect of stress and an application environment that is conducive to corrosion. Examples of such environments are highly acidic, with high moisture rates or a high concentration of dust and other particles.

To calculate the ultimate tensile stress (UTS) of a material:

  1. Divide the force stress amount placed on the material
  2. Express the obtained figure in terms of pounds or tons per square inch of material by the cross-sectional area of the tested material

The ultimate tensile strength formula is:

S = F / A

where

S = the breaking strength (stress)

F = the force that caused the failure

A = the least cross sectional area of the material

The ultimate tensile stress (UTS) is typically found in a more precise manner by performing a tensile test and recording the engineering stress versus strain curve.

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