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The results so far have been very repeatable when tested from .001ipm to .1ipm as seen on the following graph that I had posted above; http://files.engineering.com/getfile.aspx?folder=b8fe3eb2-eb6e-4e77-b313-566af32bf707&file=multiple_loads.PNG The way the fixture is actually loaded gives me a...

Thanks for the replies. It looks like I confused youngs modulus with poisson's ratio this morning. None the less, I am indeed placing the cylinder in compression am trying to figure out where this hysteresis is actually coming from.

Well it looked like one of the pictures didn't work out, so here it is again; http://files.engineering.com/getfile.aspx?folder=62d17f0d-9fec-490b-84e5-d4b71a33a0ad&file=Load_Strain.PNG

I was wondering if anyone could explain this behavior to me. The setup was I had a custom made fixture which was more or less a 3.75" high by 3" dia 6061 aluminum block put onto our compression testing machine here at work. I loaded it up to 14000lbs, and then unloaded it. Initially the ramp...

I posted this one over in the measurement forum, but have since determined that most likely the challenge I am dealing with though not specifically a composite operation is something that has been developed for the composite world. Currently I have a process where I have a heated press that is...

As a follow up I just got off the phone with these guys, http://www.4fos.com/ it looks like the carbon fiber composite guys have been dealing with this issue for years. Their website seems to do a poor job at describing what they are capable of but apparently they can measure up to 1000 points...

Temperature sensing paper may work, but would be less than ideal, as I would have to open up the press platens in the middle of the operation. Furthermore since they would lock in the highest temperatures I don't think I would have any luck understanding the cooling side. As far as using a...

I have a press that squeezes a material between 2 heated platens, in an ideal world I would love to see a thermal image of what is taking place between the press platens. In reality I could likely settle for thermocouples one/inch or so, but that would be a lot of inches at 36x36". Does anyone...

Looking through the ISO 4126-7:2013 I am 99% sure I have found an error on the attached graph. See my little markup you can see the error when it comes to their own example problem. Simply put I believe that they have the wrong label on the wrong axis. Several other sources out there appear to...

#1: Clearly this is the case, we actually do have an area where running this thing like a smart check valve would be ideal, but you are correct orientation to flow is very important with these valves. #2: I would think on this one we would defer to manufacturer's recommendations, I know that...

We are currently designing a system that is a little bigger than what we have done before and now are into a whole new class of valves. The system needs to be pneumatically controlled for explosion proofing requirements. The medium is ultra pure DI water with dissolved gas in it and rather...

One other question, the following is a Google translation of the Wikipedia page for "Druckbehälter" (Pressure Vessel), I do realize that this is a translation, and Wikipedia isn't a legally recognized source but assuming that this is correct, would it not make more sense to just use ASME and...

Virtually everything I have read points out that the PED/ASME is the law of the land depending on where you are, while the API and EN(ISO) are "Recommendations" as Marc Hellemans puts it in his book. I guess where I struggle with in all of that is what does "Recommendation" mean? To me it...

Don or anyone else, I have done a little more reading on this one and I think I have a good idea of how this one all plays out especially pertaining to the sizing and selection PRVs. I was wondering what people think of my summarized thoughts here or if I am off basis? There are 2 major laws in...

Asking the customer would be a start but this is actually a product being developed for a handful of different German customers in response to some laws being past in Germany but later something we really would like to sell all over the world. It is quite possible even if one customer accepts...

I asked the question in another posting but really this is a second discussion so I think it deserves a separate thread. I am currently working on a project being developed for use in Germany and we need to size out the relief valves. LESER's (Germany's leading relief valve manufacturer)...

Hi Don, Thanks for the reply, we are currently scaling up our current product line and starting to become more of an industrial process plant as opposed to our current equipment which is more on the lab/pilot plant scale in size. This will be about 10times bigger than we have produced in the...

I have spent some time reading through Leser's manual primarily the Chapter 7 on sizing of relief valves. Between this and other discussions on this website it would appear to be clear that the mfg needs to give me the Coefficient of Discharge or Kdr (Certified Derated Coefficient of Discharge)...