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crusher pressure piezo

Chamber pressure - Wikipedia

There are 3 basic methods for measuring chamber pressure: • Using a copper crusher or lead crusher• The Piezo method• Attaching a strain gauge to the barrel forward of the chamber

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Cartridge Pressure Standards - kwk

piezo = 1.52 * crusher - 18 He also demonstrates that within this pressure range, the CIP appears to have generally used a simple conversion between their crusher and piezo ratings, roughly equal to: piezo = 1.21 * crusher - 2.8 CIP pressures are multiples of 50 bar (about 700 psi), probably rounded after the conversion. (Please note that CIP crusher readings should not be equated with SAAMI CUP crusher

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MEMORANDUM REPORT ARBRL-MR-03129 STRESS ANALYSIS

A plot of "piezo pressure" vs. "crusher pressure" is made for each test temperature and a second order regression curve fitted to those points as shown in Figure 3. From those curves a table of "pressure" vs. 11 . ooo/oo o CO OOO HO EH i. • CO tso EH O o in in CM in en c: CD c: in CM Oo in tn i > 01 (A (/> 01 a. 3 ——1 1 1— o o o in "S^• KN o • KN tn o ^f ...

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Metallic Cartridge Chamber Pressure Measurement

Exactly how precise either the crusher or conformal transducer methods are is impossible to determine, as there is no way to know exactly what the pressure actually is. The piezo method has become the most common method used today to measure pressures. But the crusher method is still also widely used for verification and other reasons. The bottom line here is to know what you are looking at when reading pressure

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CUP, psi amp; Reloading Data - Shooting Times

04/01/2011  Pressure against the piston shortens the crusher. We measure the crusher and consult a table of pressure values provided with each crusher lot. Starting at 0.499 inch, the table lists decreasing lengths in thousandths of an inch and, beside each length, the pressure in copper units of pressure (CUP) that it takes to shorten that much. The system must be reset after each shot, requiring that you

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Nonlinear Material Behavior Analysis under High ...

01/01/2017  Based on experimental and numerical analysis, it is evident that the piezo pressure observed is higher (closer to true pressure) than copper crusher pressure at 25 mm distance from chamber end. Therefore, piezo pressure is more accurate and reliable to ensure effective ammunition proofing and due safety of weapon.

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Dynamic Calibration Of Chamber Pressure Transducers

eliminating small discrepancies in chamber pressure measurement • ATC has changed its calibration technique for piezo-electric pressure transducers to a dynamic calibration process, which will cause indicated pressure levels to go down by 0.8% • Lots of really smart people have trouble understanding why such small differences are so important

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Copper units of pressure Military Wiki Fandom

piezo = 1.52 * crusher - 18. Likewise, there is a conversion approximation formulas for estimating between CIP (European) crusher pressures (which are recorded in multiples of 50 bar) and piezo ratings, consistent with different assumptions for CIP vs. SAAMI crusher test conditions: piezo = 1.21 * crusher

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MEMORANDUM REPORT ARBRL-MR-03129 STRESS ANALYSIS

A plot of "piezo pressure" vs. "crusher pressure" is made for each test temperature and a second order regression curve fitted to those points as shown in Figure 3. From those curves a table of "pressure" vs. 11 . ooo/oo o CO OOO HO EH i. • CO tso EH O o in in CM in en c: CD c: in CM Oo in tn i > 01 (A (/> 01 a. 3 ——1 1 1— o o o in "S^• KN o • KN tn o ^f ...

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Metallic Cartridge Chamber Pressure Measurement

This second method is called the Conformal Transducer or Piezo method. It is similar to the crusher method except that a quartz crystal transducer replaces the standardized copper pellet. When pressure is applied to a crystal its electrical properties change. Using very sensitive equipment these changes can be measured and recorded, thus giving an indication of the pressure exerted. The ...

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Nonlinear Material Behavior Analysis under High ...

01/01/2017  The results in current work indicate that copper crusher pressure and piezo pressure have close agreement at lower pressures and the same is not true for higher values of pressure due to nonlinear deformation of crusher material. Similarly, the pressure observed through EPVAT system at case mouth is even more accurate and closer to true pressure. Hence, the proofing of ammunition

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Chamber pressure - Infogalactic: the planetary knowledge

The Piezo Method. Developed in the late 1960s the most common method of accurately measuring chamber pressure is the Piezo method. It is similar to the copper crusher method where a hole is drilled into the chamber, but rather than a copper slug a quartz crystal transducer is inserted and attached to sensitive measuring equipment.

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1. Introduction - Hindawi

The results in current work indicate that copper crusher pressure and piezo pressure have close agreement at lower pressures and the same is not true for higher values of pressure due to nonlinear deformation of crusher material. Similarly, the pressure observed through EPVAT system at case mouth is even more accurate and closer to true pressure. Hence, the proofing of ammunition with NATO ...

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Correlating PSI and CUP - shootingsoftware

chamber pressure was the copper crusher method. Up until that time, what we now call CUP was commonly known by two different names: CUP and PSI. The two were used practically interchangeably. Of course, this use of PSI was incorrect. It wasn't much of a problem until piezoelectric and strain gauge systems became commonly available. These systems, of course really do measure in PSI. When they ...

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Internal Ballistics

Piezo-electric units operate in a similar fashion to the copper crusher units but use a reusable crystal "crusher" that changes its electrical properties in response to pressure. When connected to suitable recording equipment the entire pressure pulse history can be recorded or displayed. The peak pressure recorded by a piezo-electric peak device usually reads higher than the figure determined ...

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British System of Chamber Pressure Measurement -

08/07/2020  The table just says “Breech Pressure”, doesn’t say what the units of pressure are: CUP (American system of Radial pressure with copper crusher), the C.I.P Peak pressure (piezo transducer measuring chamber gas pressure), the SAAMI system of measurement (piezo transducer measuring case pressure on the chamber wall) or something else. That value of 51,000 is close to the C.I.P max

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What is the real max PSI for a K31 ? - Swiss Rifles dot com

SAAMI MAP (crusher - piezo) 46000 cup - 51000 psi - 7x57 (no SAAMI specs for 7.5x55 - 46000 cup is generally accepted) 50000 cup - 60000 psi - .30-06 52000 cup - 62000 psi - .308 Win. lonniemike. 266. Member . lonniemike. 266. Post Nov 07, 2014 #5 2014-11-08T02:06. Hey Para, You did not include the higher pressures for 300 mag in either HH or WIN that were offered in the 31's.Best OldTimer ...

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Metallic Cartridge Chamber Pressure Measurement

Exactly how precise either the crusher or conformal transducer methods are is impossible to determine, as there is no way to know exactly what the pressure actually is. The piezo method has become the most common method used today to measure pressures. But the crusher method is still also widely used for verification and other reasons. The bottom line here is to know what you are looking at when reading pressure

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Validation of piezoelectric measurement system for

01/04/2010  These copper cylinders are actually made for the crusher method measurement of chamber pressure. When measuring percussion energy, the intention is to press the copper cylinder tightly against the weapon breech face. The firing pin impact causes an indent on the copper cylinder . The depth of the indent is then measured and the result used for estimating the sufficiency of the

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COVER SHEET NOTE: This coversheet is intended for you to ...

regard, several manufacturers developed different types of piezoelectric pressure transducers, such as the NATO standard Kistler type 6215 and the conformal PCB type 117B104. Major drawbacks of the crusher technique are that it is time consuming, has a limited accuracy and only gives the peak pressure. However it is still used, since it is

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Ways to Measure Pressure The Ballistic Assistant

There have been other means to test pressure, such as a copper crusher, or even lead crusher, but they are long retired means. There is no direct correlation between this antique pressure measurements to the modern Piezo Transducer. So while it is an interesting footnote it is no longer a useful measurement technique for modern ballistics.

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crusher pressure measurement tools - lazienkapolo

In normal pressure proof barrels, barrel has one drilled hole for chamber pressure measurement (either for copper crusher or for piezo transducer), whereas, in this study, a comparison of pressures measured by copper crusher as well as piezo is done at the same location using same barrel keeping all other parameters constant.

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Internal Ballistics

Piezo-electric units operate in a similar fashion to the copper crusher units but use a reusable crystal "crusher" that changes its electrical properties in response to pressure. When connected to suitable recording equipment the entire pressure pulse history can be recorded or displayed. The peak pressure recorded by a piezo-electric peak device usually reads higher than the figure determined by the copper crusher

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Correlating PSI and CUP - shootingsoftware

well correlated to each other. So if the copper crusher system is well correlated with peak chamber pressure, and the piezoelectric PSI system is well correlated with peak chamber pressure, then CUP must be well correlated with piezoelectric PSI. It cannot be otherwise. All measurement systems lie, at least a little bit. Like all measurement systems, the CUP

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1. Introduction - Hindawi

Based on experimental and numerical analysis, it is evident that the piezo pressure observed is higher (closer to true pressure) than copper crusher pressure at 25 mm distance from chamber end. Therefore, piezo pressure is more accurate and reliable to ensure effective ammunition proofing and due safety of weapon.

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K31 chamber pressure - Swiss Rifles dot com

This does sound like a confusion caused by old copper-crusher figures being compared to modern transducer figures. To simplify the answer - 3200 bar copper crusher (1939) = 3800 bar piezo transducer (2012) The actual pressure is the same - only the measurement system is different.

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MEMORANDUM REPORT ARBRL-MR-03129 STRESS ANALYSIS

The M-11 Copper Crusher Gage is a device which measures peak pressure developed in the chamber of large caliber weapons. This gage is one of two models used by the U.S. Army in testing gun systems and is used for high pressure measurements between 150 and 550 MPa. In the Third NATO Crusher Gage Comparison Trials held at Meppen,

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