Dear every one:
are the following statement correct? or which one is incorrect?

1. the NDT temperature is the starting temperature for 100% brittle fracture.
2. At the NDT temperature , the tensile strenght and yield strengh are the same (the material can only be subject to elestic deformation)
3. The NDT temperature is the lower shelf starting temperature for impact test.
4. At (NDT+120F) temperature, the material shall be fully plastic (100% fibrous fracture),whatever the condition is.

thanks
HM

I think No.1 is correct. And No.3 is wrong.
2 and 3 might be right but nothing in my knowledge gives valid support, so I vote for wrong 2 and 3 as well.
Is this a quiz?
Mauro

Dear Mauro:

for question no.3: if it is wrong, which temperature is below. or any relations between the two temperature.

thanks

He Ming

Temperature at which material is fully plastic cannot be predicted from the Drop Weight test, for sure.
It can be obtained by continuing with impact testing at raising temperature, I presume.
As far as I know this datum is not relevant, if interests you for research purposes you have to make tests, presume.
Mauro

HOW IT RELATES TO DESIGN TEMPERATUR OF ANY VESSEL?

There is no relative between NDT and impact test temp.(sharp-v),depents on the service temp. and design temp., but have some experiential values in asme section.