Computing method of mechanical dynamic compression property parameters of two-dimensional porous materials

A porous material, dynamic compression technology, applied in computing, electrical digital data processing, special data processing applications, etc., can solve problems such as difficult to obtain, difficult to accurately calculate densification strain, limited size range of two-dimensional porous materials, etc. , to achieve the effect of reliable results, simple and fast operation, and high speed

Inactive Publication Date: 2012-06-20
XIAN UNIV OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] It can be seen that the existing calculation methods are difficult to accurately calculate the densification strain under the condition of high-speed compression load
Dynamic compressive loads are typically loaded at very low rates due to test equipment limitations
And the production process is limited, the size range of the two-dimensional porous materials used as test samples is often limited, it is difficult to obtain enough samples of any size for testing

Method used

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  • Computing method of mechanical dynamic compression property parameters of two-dimensional porous materials
  • Computing method of mechanical dynamic compression property parameters of two-dimensional porous materials
  • Computing method of mechanical dynamic compression property parameters of two-dimensional porous materials

Examples

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Effect test

Embodiment 1

[0049] Calculation of Mechanical Properties Parameters of Triangular Two-Dimensional Porous Materials under Dynamic Compression

[0050] Step 1. Select aluminum as the wall material, which is a bilinear hardening material, with a Young's modulus of 68.97GPa, a yield stress of 292MPa, a tangent modulus of 689.7MPa, a Poisson's ratio of 0.35, and a density of 2700Kg / m 3 .

[0051] The finite element calculation model of the triangular two-dimensional porous material is established by using ANSYS / LS-DYNA software, such as Image 6 As shown, the triangular two-dimensional porous material 4 is placed between the horizontally arranged upper platen 1 and the fixed support plate 2, both of which are rigid materials, so that the upper platen 1 moves downward at a uniform speed toward the The two-dimensional porous material 4 applies the load. The triangular two-dimensional porous material is periodic, and the waist length of the triangle in the characteristic unit is 3mm, the base an...

Embodiment 2

[0075] Calculation of Mechanical Properties Parameters of Dynamic Compression of Circular Two-Dimensional Porous Materials

[0076] Step 1. Select the same aluminum material as in Example 1 as the wall material.

[0077] Such as Figure 10 As shown, the circular two-dimensional porous material 5 is placed between the upper platen 1 and the fixed support plate 2 arranged horizontally, and the test procedures and conditions are the same as those in Example 1. The circular two-dimensional porous material has 16 circular units along the width and height directions. Therefore, the length along the compression direction h=16×3×2=96mm, and the length w=96mm in the horizontal direction of the cross-section in the compression direction. The width in the horizontal direction of the cross-section in the direction of compression (that is, the depth of the hole) b=10mm. The downward movement speed of the upper platen is 3m / s and 100m / s respectively. Various response curves of coplanar ...

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Abstract

The invention discloses a computing method of mechanical dynamic compression property parameters of two-dimensional porous materials, which includes the following steps of establishing a finite element computing model by ANSYS / LS-DYNA software, placing the two-dimensional porous materials between an upper press plate and a fixed supporting plate horizontally, leading the upper press plate to move downwards so as to apply loads to the two-dimensional porous materials, dividing the finite element computing model of the two-dimensional porous materials into grids and starting computing; post-processing computed results by LSPREPOSTED software so as to obtain contact force and various curves between the two-dimensional porous materials and the upper press plate; and finally computing the mechanical dynamic compression property parameters of the two-dimensional porous materials according to formulas. The computing method can meet solution of the mechanical dynamic compression property parameters of the two-dimensional porous materials on the condition of high-speed and low-speed compression loading, is reliable in computing results and fast, simple and convenient in computing.

Description

technical field [0001] The invention belongs to the technical field of mechanical performance analysis of two-dimensional porous materials, and relates to a calculation method of dynamic compression mechanical performance parameters of two-dimensional porous materials. Background technique [0002] Although there are many types and configurations of 2D porous materials, they all exhibit similar mechanical properties when dynamic compressive loads are applied along the common plane direction. The parameters describing the dynamic compressive mechanical properties of two-dimensional porous materials include initial strain, initial peak stress, densification strain, and dynamic peak stress. Accurate determination of these mechanical parameters has extremely important practical application value for analyzing and evaluating the dynamic compression mechanical properties of two-dimensional porous materials, and then evaluating their energy absorption and cushioning performance. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 孙德强谢利刘淼
Owner XIAN UNIV OF TECH
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