Pressure Threshold and Influencing Factors of High-pressure Diaphragm Breaking
In order to obtain the threshold value of membrane breaking pressure of 1 Cr18 Ni9 Ti steel high-pressure diaphragm in the two-stage light gas gun and explore the influence of grooving parameters on the pressure threshold value,the static loading experiments of high-pressure diaphragm under hydraulic loading are carried out to obtain the membrane breakjng pressure and damage pattern. On the basis of the experiments,a theoretical model of the high-pressure diaphragm under pressure is established through the large-deformationtheory,and the method of calculating the ultimate load value is derived. The finite element simulation is carried out by utilizing the LS-DYNA software,the change rule of effective strain in the breaking process is analyzed,and the simulation research is made on different grooving depths,angles and grooving shapes. The results show that the breakage pressure threshold obtained by the large-deformation theory is in good agreement with the static load experimental results,and the calculated results are very close to the static load experimental results. The changes of grooving depth,angle and shape have an effect on the breakage pressure threshold,and the decrease in the grooving depth and angle,and the groove type of arc will cause the increase in the breakage pressure threshold. The destructive position of high-pressure diaphragm is changed when the grooving depth is less than a certain value.
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