Difference between strip and full specimen in tensile testing

[ukmet]

Dear All ,
I am unable to understand the following points, please guide me:

1. What is the difference between strip and full size specimen for tensile testing as per ASME SEC II Part A SA-370/530

2. Is width of gauge length a essential variable for tensile testing using strip sample?

3. Why width of gauge length is not a requirement for full section or full specimen?

I am really confused as our AI for ASME Stamped U marking vessels is rejecting our MTRs of pipes due to the questions I raised above. please do sort me out.

 

[metengr]

ukmet;
Per SA 370;

1. What is the difference between strip and full size specimen for tensile testing as per ASME SEC II Part A SA-370/530

I am confused with your question. Full size specimens are considered standard specimens for a particular product form and location of testing within the product form. Please see Figure 3 in SA 370 for sheet or plate-type standard specimens. These are full size specimens. There are subsize specimens for sheet and plate.

2. Is width of gauge length a essential variable for tensile testing using strip sample?

It can be, please see Note 5 in Figure 3, corresponding table.

3. Why width of gauge length is not a requirement for full section or full specimen?

It is for standard specimens for sheet and plate in Figure 3 and corresponding table for dimensions.

I am really confused as our AI for ASME Stamped U marking vessels is rejecting our MTRs of pipes due to the questions I raised above. please do sort me out.

ukmet, it would appear that the AI might be questioning the type of specimen geometry that was removed from the product form. If this is typical pipe, it should have been a round specimen or subsize round. You did not provide enough information.

 

[EdStainless]

The dimensions are critical, stay with the standard sizes/shapes.

Unless you are dealing with tubing, then you may pull full section pieces.
You will always get higher elongations in full sections tubing samples than in flat or machined samples.
This is so much the case that in some 2" tubing we can't test as a tube, and rather than cut flat samples we send it to a lab that can pull it as a full tube.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

 

[metengr]

ukmet;
Just a follow-up, I would encourage you to review Annex A2 in SA 370 for Steel Tubular Product forms. You have two options - full size tube specimen or longitudinal strip or round specimens. Please review Figure A2.3 and you will understand what is necessary.

 

[ukmet]

Thank you very much. I can never repay the knowledge you share with me. ALLAH bless you...

I was confused that what does full specimen mean? Does it mean that the whole pipe "AS IT IS" will be tested or it means that sample will be cut of full length of pipe? We were demanded that full length specimen does not require width of gauge length but if you will provide MTR with strip tensile test than along with gauge length width should also be mentioned.