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

Limited Time Offer

25%

Off

Get Premium API-571 Questions as Interactive Web-Based Practice Test or PDF

Contribute your Thoughts:

Submit Cancel

Nieves

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

upvoted 0 times

...

Mary

11 days ago

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

upvoted 0 times

...

Joanne

13 days 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.

upvoted 0 times

...

Ronnie

17 days 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.

upvoted 0 times

Thora

3 days ago

User 1: I think option A is correct. Temperature increases can lead to a decrease in the number of cycles to fatigue fracture.

upvoted 0 times

...

Peggy

24 days ago

I agree with Arthur, because higher temperature can weaken the material and lead to fatigue cracking.

upvoted 0 times

...

Arthur

25 days ago

I think the answer is A) Temperature increases.

upvoted 0 times

...