Pressure-bearing and fracture behaviors of metal diaphragms in a small double-pulse engine

XU Ming; FENG Feng; CAO Qinliu; DANG Jiantao

doi:10.11883/bzycj-2019-0126

Volume 40 Issue 4

Apr. 2020

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XU Ming, FENG Feng, CAO Qinliu, DANG Jiantao. Pressure-bearing and fracture behaviors of metal diaphragms in a small double-pulse engine[J]. Explosion And Shock Waves, 2020, 40(4): 045101. doi: 10.11883/bzycj-2019-0126

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XU Ming, FENG Feng, CAO Qinliu, DANG Jiantao. Pressure-bearing and fracture behaviors of metal diaphragms in a small double-pulse engine[J]. Explosion And Shock Waves, 2020, 40(4): 045101. doi: 10.11883/bzycj-2019-0126

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Pressure-bearing and fracture behaviors of metal diaphragms in a small double-pulse engine

doi: 10.11883/bzycj-2019-0126

1.
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
2.
Seventh Institute, China Aerospace Science and Technology, Chengdu 610100, Sichuan, China

Received Date: 2019-04-16
Rev Recd Date: 2019-09-29

Available Online: 2020-02-25

Publish Date: 2020-04-01

Abstract

Abstract

In order to obtain the suitable structure of the metal diaphragm in the double-pulse engine compartment, this study used the Johnson-Cook material damage model to numerically simulate the pressure-bearing and rupture process of metal diaphragms of different specifications. The results determined the metal diaphragm of a certain specification to meet the design requirements. A set of two-way pressure measuring device was designed to study the pressure-bearing and rupture behaviors of the metal diaphragm. The results show that the metal diaphragm has no structural rupture during one-pulse operation. During the two-pulse operation, the metal diaphragm breaks along the pre-cut and no metal fragments are detached. The pressure-bearing and rupture behavior can meet the working requirements in the engine. The results obtained by numerical simulation are in good agreement with the experiment data, which shows that it is feasible to use the numerical simulation method to study the bearing and cracking of metal diaphragm. Furthermore, simulation study shows that as the diameter increases with the thickness-diameter ratio of the metal diaphragm kept constant, the pressure required for the rupture increases at first and then decreases, and then it increases again.
- double-pulse engine,
- metal diaphragm,
- Johnson-Cook damage model,
- law of rupture

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References(19)

References

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