Numerical simulation of explosive separation of mild detonating fuse based on coupling algorithm of smoothed particle hydrodynamics with finite element method

SHI Tengda; CHEN Fuzhen; YAN Hong; LIU Hu

doi:10.11883/bzycj-2022-0062

Volume 42 Issue 11

Nov. 2022

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Article Navigation > Explosion And Shock Waves > 2022 > 42(11): 112201

YANG Shigang, CAI Jiongwei, YANG Ya, SUN Wensheng, MEN Jingmin. Disaster effects of combustible gas explosion in an urban shallow-buried pipe trench (Ⅰ): shock wave propagation on the ground[J]. Explosion And Shock Waves, 2022, 42(10): 105101. doi: 10.11883/bzycj-2021-0502

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SHI Tengda, CHEN Fuzhen, YAN Hong, LIU Hu. Numerical simulation of explosive separation of mild detonating fuse based on coupling algorithm of smoothed particle hydrodynamics with finite element method[J]. Explosion And Shock Waves, 2022, 42(11): 112201. doi: 10.11883/bzycj-2022-0062

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Numerical simulation of explosive separation of mild detonating fuse based on coupling algorithm of smoothed particle hydrodynamics with finite element method

doi: 10.11883/bzycj-2022-0062

SHI Tengda^{1, 2
,},
CHEN Fuzhen^{1, 2
,
,},
YAN Hong^{1, 2},
LIU Hu³

1.
Taicang Yangtze River Delta Research Institute of Northwest Polytechnic University, Suzhou 215400, Jiangsu, China
2.
School of Power and Energy, Northwest Polytechnic University, Xi’an 710025, Shaanxi, China
3.
Beijing Institute of Aerospace Systems Engineering, Beijing 100076, China

Received Date: 2022-02-22
Rev Recd Date: 2022-08-24

Available Online: 2022-09-05

Publish Date: 2022-11-18

Abstract

Abstract

Mild detonating fuse (MDF) explosive separation device is a widely used explosive separation device because of its relatively easy processing, simple structure, low cost and high reliability. In order to further study the action process and mechanism of flexible detonating cord in explosive separation device, an improved coupling algorithm of smooth particle hydrodynamics (SPH) and finite element method (FEM) is proposed in this paper. The new method is not limited to the contact algorithm between SPH method for MDF simulation and FEM method for separation device simulation; the element after complete damage failure is dynamically transformed into SPH particle by the transformation algorithm to continue its participation in the calculation, and the contact algorithm is used to calculate the relationship between the transformed particle and the untransformed finite element. By using this method, the separation process of two kinds of explosive separation structures with ring and plate shape is numerically simulated, and the accuracy and validity of the new method are verified. Then, the deformation and fracture of the separation plate and the spatter process of damage fragments are analyzed, while the stress distribution of the surface of the separation device at different time, the change trend of damage factor and the change trend of von Mises stress are obtained. Moreover, the yield damage velocity of the element and the spatter displacement velocity of fragments under various pecific internal energy of explosives are discussed. The results show that the stress at the weakening groove on the surface of the separation device is the largest, and the elements near the surface yield first; the von Mises stress shows an oscillating upward trend with time; with the increase of the initial specific internal energy of explosive, the yield damage speed of the element and the splash displacement speed of the fragments increase significantly.
- mild detonating fuse,
- explosive separation,
- SPH-FEM,
- coupling method,
- yield damage

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References

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