Pressure Threshold and Influencing Factors of High-pressure Diaphragm Breaking

doi:10.12382/bgxb.2023.0886

Abstract

Abstract:

In order to obtain the threshold value of membrane breaking pressure of 1Cr18Ni9Ti 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.

Key words: high-pressure diaphragm, breakage pressure, large-deformation theory, numerical simulation, grooving parameter

CLC Number:

TH138.52-1

WU Chunyao, SONG Chunming, LI Gan, XU Guangan, HAN Tong. Pressure Threshold and Influencing Factors of High-pressure Diaphragm Breaking[J]. Acta Armamentarii, 2024, 45(9): 3307-3316.

Figures/Tables 24

Fig.1 Position of high-pressure diaphragm[2]

Fig.2 Hydraulically loaded mold breaker

Fig.3 Hydrauli cexperimental system

Fig.4 Dimensions o high-pressure diaphragm

Fig.5 Photos of high-pressure diaphragm

Table 1 Basic material properties of high-strength alloy steel 1Cr18Ni9Ti

参数	数值		参数	数值
密度/(g·cm^-3)	7.84		强化后抗拉强度/MPa	602
屈服强度/MPa	220		延伸率	45%

Fig.6 Load-time curves

Table 2 Experimental data

试件	峰值荷载/N	峰值应力/MPa	凸起高度/mm
1-1	45531	31.37	5.56
1-2	48032	33.09	5.61

Fig.7 Diaphragm damage pattern diagram

Fig.8 Beam under bending and stretching action

Fig.9 Schematic diagram of plane axial strain calculation

Fig.10 Principal stress diagram

Fig.11 Numerical simulation model

Table 3 Stainless steel 1Cr18Ni9Ti material parameters[32]

参数	数值	参数	数值
密度RO/(g·cm^-3)	7.84	硬化模量B/MPa	400
剪切模量G/GPa	78.75	硬化指数N	0.40
弹性模量E/GPa	198	比热CP/(J·(kg^-1·℃^-1))	831
泊松比PR	0.26	最大失效主应变MXEPS	0.45
初始屈服应力A/MPa	220

Fig.12 Convergence analysis of mesh

Fig.13 Effective plastic strain diagram

Table 4 Groove depth and failure load for each diaphragm

工况	开槽深度/mm	破坏荷载/MPa
1	0	43.1
2	0.4	43.1
3	0.6	41.6
4	0.8	32.5
5	1.0	26.7
6	1.2	20.7
7	1.4	17.6
8	1.6	13.1

Fig.14 Breaking compressive stress diagram for different groove depths

Fig.15 Effective plastic strain nephograms for Case 2

Table 5 Groove angle and failure load for each diaphragm

工况	开槽角度/(°)	破坏荷载/MPa
1	30	34.1
2	45	33.5
3	60	32.5
4	75	31.8
5	90	30.9
6	105	30.6
7	120	30.3
8	150	30.2

Fig.16 Breaking compressive stress diagram for different grooving angles

Fig.17 Model of high-pressure diaphragm with square groove

Table 6 Numerically simulated results of the influence of groove shape on failure load

工况	开槽深度/mm	方形开槽峰值应力/MPa	圆弧形开槽峰值应力/MPa
1	0.8	24.1	32.5
2	1.0	15.9	26.7
3	1.2	12.8	20.7
4	1.4	10.9	17.6
5	1.6	8.6	13.1

Fig.18 Comparison of failure stresses of different grooveshapes

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