API Exam API-571 Topic 1 Question 89 Discussion

Actual exam question for API's API-571 exam

Question #: 89
Topic #: 1

For some materials such as titanium, carbon steel and low alloy steel, the number of cycles to fatigue fracture decreases with ________ until an endurance limit is reached. Below this endurance limit, fatigue cracking will not occur, regardless of the number of cycles.

ATemperature increases

BStress endurance

CPressure decreases

DNone of the above

Show Suggested Answer

Suggested Answer: B

by Eve at Jun 20, 2024, 12:53 AM

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Fairy

1 months ago

The endurance limit is a critical concept, but I'm still feeling a bit fatigued from all the studying. Guess I'll have to power through this one!

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Jeanice

6 days ago

C) Pressure decreases

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Shawna

10 days ago

B) Stress endurance

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Carman

15 days ago

A) Temperature increases

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Paul

2 months ago

Hmm, this one's tricky. I'll have to think it through carefully. Maybe I'll just guess and hope for the best.

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Brandon

12 days ago

User 3: I'll take a guess and say D) None of the above.

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Floyd

19 days ago

User 2: I'm not sure, but I'll go with B) Stress endurance.

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Alona

1 months ago

User 1: I think it might be A) Temperature increases.

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Nieves

2 months ago

Haha, this question is a piece of cake! Of course, it's B. Stress endurance. Who doesn't know that?

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Mary

2 months ago

I'm not sure, but I think it might be B) Stress endurance, as higher stress levels can also contribute to fatigue failure.

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Joanne

2 months ago

I'm going with D. None of the above. The question is asking about what the number of cycles decreases with, not what happens below the endurance limit.

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Pamella

2 months ago

User 2: I disagree, I'm going with B) Stress endurance.

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Georgene

2 months ago

User 1: I think it's A) Temperature increases.

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Ronnie

2 months ago

Option A seems correct to me. As temperature increases, the material's resistance to fatigue decreases, leading to a lower number of cycles to failure.

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