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A finite element mesh modeling method of a projectile rhombus groove,

A finite element and mesh technology, applied in the field of finite element mesh modeling of projectile diamond grooves, can solve problems such as low precision, error-prone, cumbersome steps, etc., and achieve good end face consistency, fast response speed, and analysis convenient effect

Active Publication Date: 2019-03-08
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the complex geometry of the diamond-shaped grooves of the missile body, it is very time-consuming to establish the finite element mesh of the diamond-shaped grooves of the missile body using commercial modeling software
First establish a 3D model of the diamond-shaped notched projectile, and then import it into the finite element software for meshing. Generally, tetrahedral meshing is used, and the accuracy is not high; if a hexahedral mesh is used, one of the notched grooves needs to be divided first, and then The mirror image is copied to other grooves, but if the angle of each groove is different, it cannot be mirrored directly, and it needs to be re-divided, and the steps are cumbersome
In addition, if you need to change the feature size of the groove, you need to re-divide the finite element mesh. A large number of repetitive operations in modeling are cumbersome and error-prone, which seriously affects the design efficiency

Method used

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  • A finite element mesh modeling method of a projectile rhombus groove,
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  • A finite element mesh modeling method of a projectile rhombus groove,

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Embodiment Construction

[0036] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0037] The invention provides a finite element grid modeling method for projectile rhombic grooves, using nodes to construct rhombic hexahedral meshes, filling the front end face and rear end face of the projectile mesh to complete mesh division, and then according to the rhombus groove elements The side length, angle and depth of the grid are respectively deleted along the circumferential direction and radial direction to complete the groove, which specifically includes the following steps:

[0038] Step 1: Summarize the geometric characteristics of the diamond-shaped groove of the projectile;

[0039] according to figure 1 , figure 2 Summarize groove width w, groove depth h, groove interval a, groove angle θ, projectile length L, projectile internal radius R 1 , the thickness T of the projectile and the grid number N of the diamond-shaped groove on t...

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Abstract

The invention provides a finite element mesh modeling method of a projectile rhombus groove, which utilizes nodes to construct a rhombus hexahedron mesh to complete mesh division by completing the front face and the rear face of the projectile mesh, and then deletes the mesh along the circumferential direction and the radial direction according to the side length, the angle and the depth of the rhombus groove unit to finish grooving. The invention can realize the finite element mesh modeling of the projectile rhombus groove with different geometrical characteristics, and the method is simple and high in efficiency.

Description

technical field [0001] The invention relates to the technical field of ammunition, in particular to a finite element grid modeling method for diamond-shaped notches on an ammunition. Background technique [0002] Grooving of projectiles is to use machining or other methods to process grooves on the inner and outer surfaces of projectiles, and use the stress concentration area formed by the grooves to control the projectiles to be broken into fragments of predetermined size and shape according to the designed grid system. The rhombus groove means that the grid shape of the groove is rhombus. When designing the projectile with diamond-shaped notches, it is necessary to calculate whether the projectile with diamond-shaped notches can be broken into fragments of predetermined size and shape under detonation loading. By establishing the finite element model of the projectile with rhombic grooves for fragment forming analysis, the fragmentation of the projectile with diamond groo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23Y02T90/00
Inventor 蒋建伟邱浩
Owner BEIJING INSTITUTE OF TECHNOLOGYGY