What is the most rare damage mechanism?
What is the most rare damage mechanism?
(OP)
In API 571 there is about 70 different types of damage mechanisms list. Of course, each different mechanisms has a variety of variants.
From your experience, which mechanism is the most rare? Personally, I have never seen dealloying myself.
From your experience, which mechanism is the most rare? Personally, I have never seen dealloying myself.
RE: What is the most rare damage mechanism?
RE: What is the most rare damage mechanism?
What I do is gain as much understanding of the failure and system it occurred in as I can. Then, I can narrow down the possibilities of what is in the realm of possibility to what could have happened, including possible failure mechanism(s). You may well need to do further testing to confirm/eliminate the possibilities. I only look at probability of candidate mechanisms if I cannot confirm data through analysis, assuming two or more potential mechanisms are still present.
At the end, you have to determine what makes the most sense for the system you are looking at.
RE: What is the most rare damage mechanism?
RE: What is the most rare damage mechanism?
I was shocked once when I found a list of environments that would cause SCC in every know alloy system (even Au and Pt).
What is rare for one engineer may be day to day for another.
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P.E. Metallurgy, consulting work welcomed
RE: What is the most rare damage mechanism?
I was just curious to see what others have experienced.
I try to read API 571 often to become more aware of 70+ mechanisms.
RE: What is the most rare damage mechanism?
Spontaneous combustion?
Just kidding.
Seriously, I am on a team examining a single unique failure in a pipe about two decades back, which stymied highly qualified investigators at the time, and we have not been able to add anything to their work. Any further information is confidential. There are probably more cases like ours.
Fair to say the rarest mechanism hasn’t been discovered yet. A finding of ‘indeterminate’ however usually means insufficient information.
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"
RE: What is the most rare damage mechanism?
RE: What is the most rare damage mechanism?
RE: What is the most rare damage mechanism?
RE: What is the most rare damage mechanism?
RE: What is the most rare damage mechanism?
Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]
RE: What is the most rare damage mechanism?
I'd love to see the report that came out of that.
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"
RE: What is the most rare damage mechanism?
Mo oxide forms and it has a melting point below the alloy.
The liquid Mo oxide begins running down the part cutting grooves in it.
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P.E. Metallurgy, consulting work welcomed
RE: What is the most rare damage mechanism?
One of the higher Mo fillers like C-286 or C-22 is now recommended.
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"
RE: What is the most rare damage mechanism?
RE: What is the most rare damage mechanism?
RE: What is the most rare damage mechanism?
can you think of a damage mechanism that isn't discussed in literature?