Larry,
Thank you for responding to my reply. It is appreciated. First off, the ANSI-SAMMI organizations ONLY recognize two (2) pressure testing techniques to test ballistic pressures of cartridges. Either piezoelectric tranducers or crusher cylinders are used in special test barrels that have lateral holes bored into them to accept the crusher cylinders or piezoelectric transducers, to test ballistic pressures for cartridges. ANSI-SAMMI does NOT recognize any type of " outer barrel surface strain-gage measurement" in order to predict internal ballistic cartridge pressure. That is a documented fact. Furthermore, the hot propellant gas thermal effects in the barrel bore cause the Young's Modulus of Elasticity to decrease locally in value so that the Modulus of Elasticity now varies across the wall-thickness and affects the outer surface strain-gage measurement. Whether you believe the facts I have stated or not is irrelevant to me. Anyone, you or Dr. Oehler or both, can propose a new "outer barrel surface strain-gage testing technique", to ANSI-SAAMI , to estimate the ballistic pressure of cartridges. When that is done, ANSI-SAMMI can then recognize three(3) pressure testing techniques for cartridges.
So once again, Larry we will have to agree to disagree on the validity of the "outer barrel surface strain-gage technique" to predict cartridge allowed pressures.
Best regards,
CJR