Well btrueblood, we test our plastic when they hit below 100ppm RH. They are put in the jar at about 50ppm.
So if I knew what was GMS I could calculate how much moisture can cross this type of plastic (our lab is at 50%RH - 23C)and how long I can keep the product dry (below 100ppm.
If the...
Hello All.
A supplier of polymer bag is rating their product for WVTR at 0.048 GMS/100SQ INCHES/24 HOURS.
A) What is GMS ?
B) Will this be able to replace the Masson Jar we are using now?
Note:
We keep dry pellets in Masson Jar so the %RH is kept constant. We do this so can measure the...
Well, If coating is impossible (lubrified liner etc. on your part or the other part) then use a peening that induce deeper compressive stress. You can look at LPB (Low-Plasticity Burnishing) or Laser Peening or Water Peening.
Good Luck
CoryPAd, I stand corrected ! Thank you.
1) Poisson is only relevant in the elastic zone like noted.
2) the R factor is obtained in a similar fashion has the Poisson's ratio but in the plastic domain. (we test for it in my lab)
3) So to connect this with texture I could simply point that the...
I would like to add my two cents to Mcquire's very well vulgarized explanation (I should have been more to the point...)
A) Textured material show anisotropy has noted.
B) Because all grain structure have anisotropy!
C) So if one could force all the grains to have the same preferred...
Short answer: Texture is the "generel" grain orientation of the material under investigation.
So for exemple in stainless steel the lamination process (cold work) will favor the principale orientation componant of {011}<211> (to a max of 25 to 1).
And since the mechanical properties...
Hmm! .. aluminumphil!
There must be a mistake in the formula or my calculator is broken?
The above coil would give:
R = 12"
r = 8"
t = 0.031"
L = 0.031 / pi * (12²-8²)
L = 1.2 e-4 ???
May I suggest this:
L = pi * (R²-r²)/t
here you will get
L = 8107 " or 676 ft ...
Thank you all for your suggestions,
I've done some theoretical calculations that are hmm questionable. I might finally go to an instrumented piston or ... I'm still looking.
As soon as I get some good results I'll let you know. (I'll look at the deflection)
Christian
P.S. if you ear anything...
I could simplify the problem further (maybe to much?)
We process flat material so it would be more like a spring clock (has suggested by Rich) with the last wrap functional. The other wrappes would not be functional because the internal friction of the steel keeps it from pulling. So I am...
Well,
We take 0.250" thick by usually 48" wide strip of stainless steels and run it throw a cold mill to bring it to a lower thickness and improve its mechanical properties (yield, UTS,...). At the end of the mill the strip is wrapped around a mandrel and builds up until the strip is...
Hello Fellow mechanical eng.
I need an easy way to calculate the hold down pressure or strapping strength required to keep a coil wrapped.
The variables are: Coil diameter, Thickness of material, Width of material, Yield strength, Ultimate strength, Modulus of elasticity, Poisson's ratio...
Well,
My reply is very late but... tada! I have (I think) the answer:
(Sorry it's a little long)
I did a LOT of tests (based on your info.. thank you) and after a lot of failures (our ration of good was low) I finally decided to change the tool (knife) that was machining our samples. I moved...
Hmm,
I looked for SAE420! I must have the wrong book! Maby ASTM 420 ?
But 7C27Mo2 is a martensite Stainless Chromium Steel.
So Annealing is around 1500°F to 1600°F and Process anneal is from 1200°F to 1400°F. But close to 800 I would wory about Carbides (precipitation from 900°F to 1700°F) that...
Hmm,
In all the contamination analysis that I did performed and contracted to get done I always stay very skeptical of any ONE source analysis. You have to get to the contaminant by different routes and they should merge, then you have an idea of what is your contaminant.
A) A max of info on...
Good morning,
EDS is a nice tool for elemental analysis but it can't say what is bonded to what! The Oxygen could be almost entirely bonded to the C (organic contaminant) and that would solve your question. You need at least an XPS analysis and if you have money a SIMS. These will really give...
I know it is an old thread but I wanted to give my 2 cents!
We make a vary wide variety of stainless grade and some are sold annealed or underannealed*. From our salt spray test I can say that the corrosion resistance of the underannealed material is lower than it's annealed chemical twin. So...
We test thousands of flat Stainless steels (>50 variations) and the only one that breaks out of the extensometer's 2" gage length are some types of 301 SS. They break at the beginning of the reduce section; where the necking or shoulder joins the centre part of the mechanical test sample...
