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4130 in the Atlas of Stress Strain Curves

4130 in the Atlas of Stress Strain Curves

(OP)
In the Atlas of Stress-Strain Curves, 2nd ed, in chart AS.005 (https://books.google.com/books?id=up5KS9fd_pkC&...) they present 3 charts of tensile stress-strain curves up to yield for 4130 at room and elevated temps for three different heat treatments. Now, first of all, the labeling of the charts is a bit odd - they refer to the "Left", "Center", and "Right" charts, but they're arranged on two rows and labeled like this:

(a) (b)
..(c)..

Based on the nominal strengths listed in the caption - Left is 150 ksi, Center is 180 ksi, and Right is 200 ksi - I'm pretty sure that the order is

(150) (200)
...(180)...

So that's one thing. The other thing is, check out the modulus on chart (c). The RT curve crosses right at .004 strain, 100 ksi, for a modulus of 25 Msi, when I'm expecting something closer to 29-30. If you check charts (a) and (b), they go through .004 strain, 120 ksi, for a modulus of 30 Msi, just as expected. So I think chart (c) is in error.

The caption references WADC TR 56-340, as published in Aerospace Structural Materials Handbook, Vol 1, Code 1201. Unfortunately, I've been unable to find either of these. Does anybody have a copy?

RE: 4130 in the Atlas of Stress Strain Curves

I don't know where you're looking a a quick google for "WADC TR 56-340" found a pdf in dtic.

another day in paradise, or is paradise one day closer ?

RE: 4130 in the Atlas of Stress Strain Curves

apologies, that's what you get for seeing the pdf download and assuming it is what you looked for (it was in fact WADC TR 56-358) ... sigh

another day in paradise, or is paradise one day closer ?

RE: 4130 in the Atlas of Stress Strain Curves

(OP)
Yeah, I found that and got excited, too. I actually sent basically my OP to the contact listed for ASM International's Materials Properties Database Committee. I don't know where this would go from there, given that it's been 15 years since the last edition of the handbook, although the first edition was published in 1986, so that was a 16 year gap. Extrapolating linearly, I guess we should expect a new edition next year! smile

RE: 4130 in the Atlas of Stress Strain Curves

(OP)
Thank you, Mac! I think the stress-strain curves in the Atlas must have been added in a later publication of the Handbook, though - it doesn't show up in the 4130 section, and WADC TR 56-340 isn't in the references for 4130. But this is still a helpful link, as I only had the 1972 publication of volume 2 handy.

RE: 4130 in the Atlas of Stress Strain Curves

Aerospace Structural Materials Handbook became the Aerospace Structural Metals Handbook [ASMH] when it was published and updated by Battelle and Purdue-U.
Unfortunately the ASMH is 'technically Obsolete'. CINDAS LLC https://cindasdata.com/products/asmd now publishes the replacement document(s) Aerospace Structural Metals Database (ASMD)... a VERY extensive, useful and precise database of metallic materials. HOWEVER the ASMD come at a significant subscription cost.

Since my company has an extensive Metallic M&P design manual system, I can't seem to get anyone interested in getting a subscription to the ASMD... for the rest of us mere-mortal engineering souls who want/need more than just mechanical allowables and a few generalities on the alloy.

NOTE.
Old versions of the ASMH, STILL provides high quality/in-depth info on many common alloys! The on-line ASMH is one of my 'back-pocket' secret references that has come-thru for me many times!



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]

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