What is ultimate tensile strength on an engineering stress-strain curve?

It is the maximum tensile stress the specimen reaches before the curve falls toward fracture.

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  1. The stress where yielding begins
  2. The stress at the moment of fracture
  3. The maximum resistance reached in tension ✔

Why: Ultimate tensile strength is the peak engineering stress in a tensile test. It is different from yield strength, which marks the start of specified permanent deformation.

Huh, didn't know that: A ductile specimen can begin localized narrowing, called necking, near its ultimate tensile strength.

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The tensile specimen peaked in its final exam.
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References

Answer: The maximum resistance reached in tension. Ultimate tensile strength is the peak engineering stress in a tensile test. It is different from yield strength, which marks the start of specified permanent deformation.

  1. DOE Fundamentals Handbook: Material Science www.energy.gov/sites/default/files/2026-04/DOE-HDBK-1017-93_VOL1.pdf
    Ultimate tensile strength (UTS) is the maximum resistance to fracture.
    Checked 2026-10-10.

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