Φ 8 X 13 Mm Static And Dynamic Differential Pressure Copper Column

For more than hundred years, the plastic pressure-measuring method has been the main method to test the weapon chamber-pressure because of its advantages of convenient use, simple operation, stable data, economy and reliability etc. There must be static-dynamic discrepancy when the copper cylinder adopted the system of static calibration measures the chamber-pressure. In order to curb the static-dynamic discrepancy, the means of once preloaded and second preloaded are often used on copper cylinder. Even so it does not completely eliminate static-dynamic discrepancy. By analysis static-dynamic discrepancy about these methods of without-preloading, once-preloading and second-preloading, this paper defines the application scope of the three methods. The main work consists of the following parts.1. The mathematical model of copper cylinder pressure-measuring system is established according to the pressure-measuring mechanism of copper cylinder. The numerical solution program is made using the Matlab/Simulink, and the deformation regularity of copper cylinder under different pressure is obtained according to the simulating calculation.2. With the mathematical model, the simulation on Φ8×13mm copper cylinders of without-preloading and once-preloading has been done. By means of theoretic analysis, the static-dynamic discrepancy is inevitable existence in the methods of without-preloading and once-preloading.3. The static-dynamic discrepancy tests in the methods of without-preloading and once-preloading for Φ8×13mm copper cylinders are done on simulated gun device. The static-dynamic discrepancy regulation of two methods has been obtained through the processing of the experimental data. The method of correcting the static-dynamic discrepancy is discussed and the pressure correcting formula by means of dimensional analysis and similarity theory is obtained. The effectiveness s of the correcting formula is verified by the tests on the simulated gun device.4. Because of the length and the volume of Φ8×13mm copper cylinder with the without-preloading, it is not to test on simulated gun device. The plastic deformation process of copper cylinder dynamic pressure pulse is simulated by the finite element software of ABAQUS and the information of the displacement and pressure has been obtained.5. By analysis the results of Simulink and the data of actual shot tests, the static-dynamic discrepancy of the three methods is checked and given their application scope.