Impact response simulation analog method based on novel hybrid stress tetrahedron unit

A simulation method and shock response technology, applied in the field of computational mechanics, which can solve problems such as large amount of calculation, discontinuous element stress, and poor accuracy.

Active Publication Date: 2018-10-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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Problems solved by technology

Among them, the traditional 4-node unit has very poor accuracy in the analysis of this type of problem. This is because the stress is obtained by the partial derivative of the displacement, so that the internal stress of each unit is constant, and the stress between the units is not continuous ; For the 8-node hexahedral element, when the model is too complex, the mesh division quality is very poor; and the modified 10-node tetrahedral element makes up for the shortcomings of the above two elements, but the amount of calculation is too large

Method used

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  • Impact response simulation analog method based on novel hybrid stress tetrahedron unit
  • Impact response simulation analog method based on novel hybrid stress tetrahedron unit
  • Impact response simulation analog method based on novel hybrid stress tetrahedron unit

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Embodiment Construction

[0098] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0099] see figure 1 , a shock response simulation method based on a novel hybrid stress tetrahedron element provided by the present invention is realized through the following steps:

[0100] Step 1. Model the target structure and use tetrahedral meshing to solve the domain.

[0101] In this embodiment, the structure is properly modeled as required, and then the structure is subdivided using a tetrahedral mesh.

[0102] Step 2. According to the momentum equation, its weak form is derived based on the principle of virtual work.

[0103] In this embodiment, step 2 is implemented through the following process:

[0104] According to the momentum theorem, the sum of external forces acting on a system is equal to the material derivative of momentum.

[0105]

[0106] Among them, V represents the entire calculation domain, A represents the force surface,...

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Abstract

The invention provides an impact response simulation analog method based on a novel hybrid stress tetrahedron unit, and belongs to the field of computational mechanics. When the method solves an impact dynamics problem, the good fitting of a tetrahedron grid for a complex structure is kept, meanwhile, the accuracy of a stress field is improved, and the method is an explicit dynamics numerical value calculation method with good stability. Meanwhile, on the basis of a traditional tetrahedron unit, knot stress is subjected to smoothing, the complex model can be subjected to favorable fitting, inaddition, unit stress accuracy is greatly improved, and meanwhile, a calculated amount is small.

Description

technical field [0001] The invention belongs to the field of computational mechanics, in particular to an impact response simulation method based on a novel hybrid stress tetrahedron unit. Background technique [0002] Impact dynamics problems exist in many industries such as aerospace, marine, automotive, civil engineering, machinery, etc. Specifically, problems such as projectile armor penetration, life-saving ejection seat being impacted, container falling, car collision and rocket launch are all impact dynamics problems. This is due to the dynamic response produced by the local impact load of the object. Among them, the impact load refers to the load that changes rapidly with time. It can be observed that this type of problem is significantly different from the response problem under static load. The structure may undergo large deformation and rotation, and the material may be damaged. This is a problem involving geometric nonlinearity, material nonlinearity and bounda...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23G06F2119/06
Inventor 徐立杨再超杨中海李斌
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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