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API-571 Exam - Topic 1 Question 118 Discussion

Actual exam question for API's API-571 exam
Question #: 118
Topic #: 1
[All API-571 Questions]

At high temperatures, metal components can slowly and continuously deform under load below the yield stress. This time dependent deformation of stressed components is known as __________.

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Suggested Answer: C

by Tarra at Nov 22, 2025, 01:47 AM

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Mickie
7 hours ago
I thought deformation was just a general term, not specific!
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Peggie
5 days ago
Creep happens at high temps, right?
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Stephaine
10 days ago
Wait, isn't thermal fatigue a thing too?
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Lamonica
29 days ago
Totally agree, it's definitely creep.
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Evan
1 month ago
Creep? Sounds like my grandpa after a big meal. Haha.
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Vincenza
1 month ago
Creep. Isn't that when the metal just slowly gives in to the pressure? Sounds painful.
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Gaynell
1 month ago
Creep, easy. I remember that from my engineering mechanics course.
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Nguyet
2 months ago
Creep, for sure. That's the time-dependent deformation under stress at high temps.
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Hershel
2 months ago
Creep, definitely creep. I learned about this in my materials science class.
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Annamae
2 months ago
I feel like thermal fatigue is more about temperature changes affecting materials, so I’m leaning towards C) Creep as well.
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Edison
2 months ago
I’m a bit uncertain about this one. I thought fatigue was related to repeated loading, but I can't recall the exact definition of creep.
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Micaela
2 months ago
I remember practicing a question similar to this one, and it was definitely about deformation over time. Creep sounds right to me.
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Marcos
3 months ago
I think the answer might be C) Creep, but I'm not entirely sure. We covered this in class, but I get confused with the terms sometimes.
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Georgiann
3 months ago
I'm feeling pretty confident about this question. Creep is the time-dependent deformation that occurs in materials at high temperatures when they are under constant stress, but below the yield strength. I'll be sure to emphasize that distinction in my response.
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Justine
3 months ago
I'm a bit confused on this one. Is creep the same as thermal fatigue? I'll have to think through the definitions carefully and make sure I don't mix up the different failure modes. Wish me luck!
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Dawne
3 months ago
Okay, I've got this. Creep is the key term here - it's the gradual deformation of a material over time when it's subjected to levels of stress below its yield strength. I'll make sure I explain the mechanism of creep in my answer.
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Starr
3 months ago
It's called creep!
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Evette
3 months ago
I think it's Creep. Sounds right.
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Kaitlyn
4 months ago
Hmm, this seems tricky. I'm not totally sure about the difference between creep and fatigue. I'll need to review my notes on the various types of deformation and failure mechanisms in materials.
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Dana
4 months ago
I think this is asking about creep, which is the time-dependent deformation of materials under constant stress below the yield point. I'll focus on understanding the key concepts of creep and how it differs from other types of deformation.
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Ivette
4 months ago
Understanding creep helps in design!
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Jarod
4 months ago
Creep is so interesting!
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