What is the difference of DBTT & FATT
What is the difference of DBTT & FATT
(OP)
Dear all,
It seems that both DBTT & FATT are reflecting the temperature from ductile to brittle.
Any difference between DBTT and FATT:
-ductile-brittle transition temperature (DBTT)
-fracture appearance transition temperature(FATT)
Thanks.
It seems that both DBTT & FATT are reflecting the temperature from ductile to brittle.
Any difference between DBTT and FATT:
-ductile-brittle transition temperature (DBTT)
-fracture appearance transition temperature(FATT)
Thanks.





RE: What is the difference of DBTT & FATT
The DBTT is similar except the DBTT value is based on the inflection point of a CVN impact energy versus test temperature curve, where the CVN upper shelf (ductile) changes to lower shelf CVN (brittle) values at a specific test temperature.
RE: What is the difference of DBTT & FATT
You can do similar things with K1c and other fracture or fatigue tests. People tend to use impact because it is fast, cheep, and easy. But remember in either case the mathematically determined 50% point is already well into the brittle region, you to ask what level of property degradation the application can tolerate.
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P.E. Metallurgy, Plymouth Tube
RE: What is the difference of DBTT & FATT