Method for testing buffer performance of two-dimensional porous material under high-speed impact condition

A high-speed impact, porous material technology, applied in the direction of analyzing materials, measuring devices, strength characteristics, etc., can solve the problems that cannot be used to study the buffer performance of two-dimensional porous materials, and achieve the effect of simple evaluation methods

Inactive Publication Date: 2015-04-22
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for measuring the cushioning properties of two-dimensional porous materials under high-speed impact con

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  • Method for testing buffer performance of two-dimensional porous material under high-speed impact condition
  • Method for testing buffer performance of two-dimensional porous material under high-speed impact condition
  • Method for testing buffer performance of two-dimensional porous material under high-speed impact condition

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Embodiment 1

[0043] Determination of the dynamic cushioning performance of the aluminum circular two-dimensional porous material with R=3mm and t=0.07mm under the coplanar impact velocity of v=70m / s.

[0044] Taking a circular two-dimensional porous material as an example to illustrate the steps and feasibility of this method, the schematic diagram of the dynamic impact test is shown in Figure 5 shown. The shape of the sample is cuboid, the cross-sectional width (that is, the depth of the unit hole) b=90mm, and the number of units arranged in both directions of the coplanar plane is 16, then the length of the rectangular cross-section of the sample along the impact direction l=96mm, along the impact direction The length of the upper sample is h=96mm, and the size is large enough to eliminate the influence of the boundary. The radius of each unit in the sample is R=3mm, and the wall thickness t=0.07mm, then the density of the circular two-dimensional porous material sample is Among them...

Embodiment 2

[0046] Determination of dynamic cushioning performance of aluminum triangular two-dimensional porous material with l=3mm, θ=60°, t=0.15mm under coplanar impact velocity of v=50m / s.

[0047] The three-dimensional structure of triangular two-dimensional porous material is shown in the figure Figure 8 As shown, l is the length of the hypotenuse of the triangular characteristic unit, and θ is the base angle of the unit. Sample depth b=30mm, x 1 and x 2 The number of characteristic units in each direction is 8×10, and the external dimensions of the sample are h=20.7848mm, l=30mm. The F-u curve is obtained by the test, the σ-ε curve can be obtained after standardization, and the e-ε curve can be obtained after integrating the σ-ε curve. The σ-ε and e-ε curves are respectively as follows Figure 9 with 10 shown. Then the sample density ρ * = 1 + cos θ ...

Embodiment 3

[0049] l = 3mm, t = 0.1mm aluminum square two-dimensional porous material to determine the dynamic cushioning performance under the coplanar impact velocity of v = 20m / s.

[0050] The three-dimensional structure of the square two-dimensional porous material is as follows: Figure 11 As shown, l refers to the side length of the square characteristic unit. Sample depth b=40mm, x 1 and x 2 The number of characteristic units in each direction is 15×13, and the external dimensions of the sample are h=45mm, l=39mm. The F-u curve is obtained by the test, the σ-ε curve can be obtained after standardization, and the e-ε curve can be obtained after integrating the σ-ε curve. The σ-ε and e-ε curves are respectively as follows Figure 12 with 13 shown. Get the sample density ρ * =2t / l(1-t / (2l))=177kg / m 3 , the initial strain ε 0 =0.0038, densification strain ε D =0.8562, initial peak stress σ 0 =5.8670MPa, dynamic peak stress σ p = 0.8814MPa. Obtain each buffer performance eva...

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Abstract

The invention discloses a method for testing the buffer performance of a two-dimensional porous material under the high-speed impact condition. The method comprises the steps of carrying out buffer performance testing on the two-dimensional porous material to obtain a corresponding impact force displacement curve, standardizing the impact force displacement curve to obtain a corresponding standardized stress strain curve, and establishing and calculating buffer performance evaluation indexes such as optimal unit volume energy absorption, optimal specific energy absorption, impact force efficiency and a minimal dynamic buffer coefficient, so as to realize the testing of the dynamic buffer performance of the two-dimensional porous material under the high-speed impact load condition. According to the method, the problem that the buffer performance of the two-dimensional porous material under the high-speed impact load condition cannot be researched by virtue of an existing method is solved, samples of different thickness do not need to be tested, an evaluation method is simple, the load condition is similar to an actual impact load and does not influenced by the fluctuation of a curve amplitude value, and the method can be used for researching the influences of factors such as impact speed, structure parameters and unit forms to the buffer performance of the two-dimensional porous material.

Description

technical field [0001] The invention belongs to the technical field of testing and evaluating the dynamic cushioning performance of two-dimensional porous materials, and in particular relates to a method for measuring the cushioning performance of two-dimensional porous materials under high-speed impact conditions. Background technique [0002] At present, the existing methods for measuring the cushioning performance of materials include: static compression test method [GB8168-2008], dynamic compression test method [GB8167-2008] and energy absorption diagram method. The static compression test method obtains the "buffer coefficient-maximum stress" curve by processing the quasi-static compression response curve of the buffer material. The load condition of this measurement method is similar to static compression, and in actual cushioning applications, cushioning materials often bear the effect of dynamic impact loads. The column will reach 50-60m / s, so this method cannot be ...

Claims

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Application Information

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IPC IPC(8): G01N3/00G06F19/00
Inventor 孙德强邢月卿李国志张小强高芬赵建伟
Owner SHAANXI UNIV OF SCI & TECH
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