Ultimate tensile stress of material

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SUMMARY

The discussion centers on the confusion regarding the Ultimate Tensile Stress (UTS) and the breaking point of a metal as represented in a stress-strain curve. Participant A asserts that point A corresponds to the UTS, while the answer key indicates point B as the correct answer. The consensus, after further review of relevant literature, confirms that point A is indeed the UTS, while point B represents the breaking point, particularly during the necking phase of the material. The distinction between the "Engineering Stress-Strain" curve and the "True Stress-Strain" curve is crucial for accurate interpretation.

PREREQUISITES
  • Understanding of stress-strain curves
  • Familiarity with Ultimate Tensile Strength (UTS)
  • Knowledge of material behavior under tensile loading
  • Basic principles of mechanical engineering
NEXT STEPS
  • Study the differences between Engineering Stress-Strain and True Stress-Strain curves
  • Learn about material necking and its impact on tensile testing
  • Explore the definitions and calculations of Ultimate Tensile Strength
  • Review tensile testing standards and methodologies
USEFUL FOR

Mechanical engineers, materials scientists, students studying material mechanics, and professionals involved in material testing and evaluation will benefit from this discussion.

songoku
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Homework Statement
The diagram shows the stress-strain curve for a metal. Which label corresponds to the Ultimate Tensile Stress for this metal?
Relevant Equations
None
1661417992523.png


My answer is A but the answer key is B.

I don't understand why B. I would think B is the breaking point.

Thanks
 
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songoku said:
Homework Statement:: The diagram shows the stress-strain curve for a metal. Which label corresponds to the Ultimate Tensile Stress for this metal?
Relevant Equations:: None

I would think B is the breaking point
Is there a difference?
https://en.wikipedia.org/wiki/Ultimate_tensile_strength

Edit… I misread the article at that link the first time. Reading it again, it agrees with you that A is the UTS.
 
Last edited:
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The “Engineering Stress-Strain”curve is misleading in that area. The “True Stress-Strain” curve is what you need to consider.
 
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songoku said:
Homework Statement:: The diagram shows the stress-strain curve for a metal. Which label corresponds to the Ultimate Tensile Stress for this metal?
Relevant Equations:: None

View attachment 313238

My answer is A but the answer key is B.

I don't understand why B. I would think B is the breaking
 
A is UTS and B is Breaking point
 
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Thank you very much for the help haruspex, erobz, Martin TSK, Lnewqban
 
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