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Journal of Projectiles, Rockets, Missiles and Guidance >

2021 , Vol. 41 >Issue 4: 15 - 19

DOI: https://doi.org/10.15892/j.cnki.djzdxb.2021.04.004

Study on the Crack-tip Fields of Solid Propellant Grains at the Ignition Transient

  • LONG Bing 1 ,
  • GAO Shuangsheng 1 ,
  • JIN Wei 2
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  • 1 School of Aviation and Mechanical Engineering, Changzhou Institute of Technology, Jiangsu Changzhou 213032, China
  • 2 No.96811 Unit, Zhejiang Jiangshan 324109, China

Received date: 2020-12-30

  Online published: 2025-02-13

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Abstract

Based on the linear viscoelastic model, dynamic crack-tip fields of propellantgrains structure contains precrack under the ignition pressurization conditions is studied by numerical method. Stress singularity is existence at the crack tip and a very small area near the crack tip, and the front end of the crack is mainly subjected by tensile stress.The crack tip stress strain gradually decreases with the increase of the distance r and tends to a constant value. When θ is between 0° and 90°, the maximum principal stress and hoop strain increase with the angle increases, and when θ is between 90° and 180°, it gradually decreases as the angle increases.Based on the finite element calculation results, the open stress fields in crack-tip ahead are analyzed, and the dynamic stress intensity factors are obtained, and compared with the dynamic fracture experimental results, the fatalness of crack initiation is predicted.

Key words： propellant grain; dynamic; crack-tip fields; ignition transient

Cite this article

LONG Bing , GAO Shuangsheng , JIN Wei . Study on the Crack-tip Fields of Solid Propellant Grains at the Ignition Transient[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2021 , 41(4) : 15 -19 . DOI: 10.15892/j.cnki.djzdxb.2021.04.004

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