Clap,
Yes, it calculates SD.

So, in response Jerry's inference that this type of data is questionable or not as directly applicable to our needs, I will say; I believe it is as applicable as pressure data from a sources with a pressure gun having direct piezio transducers.

Why do I believe that? Simple, a pressure gun with a piezio tranducer like Mr. Armbruster's will give pressure. It won't tell you stress. Stress has to be calculated from the pressure and the dimensional characteristics. Strain gages measure stretch of the barrel, then you (or the computer) calculate the stress. Stress is what fails barrels. Strain gages are just one step closer to actual stress levels. In the case of the Pressure Trace that Bill and I have, we use it to calculate pressure. Then we armchair postulate as to whether or not we want to fire that load in our guns. Both methods of measurement are perfectly acceptable when all parameters are known. The trouble with both methods, for our application, is: we don't typically have all the parameters to use either data with high confidence. But both have value if used conservatively.

Last edited by Chuck H; 06/03/11 02:19 PM.