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Hopkinson pressure bar test device

A Hopkinson pressure bar and test device technology, which is applied in the direction of testing the strength of materials using a single impact force, can solve the problems such as the technical report on the control of the compression strain of the Hopkinson pressure bar and other problems, and achieves simple structure and accurate control. Reliable, Strain Controlled Effects

Pending Publication Date: 2017-03-08
SHANDONG NON METALLIC MATERIAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no report on the control test technology of the compression strain of the Hopkinson compression bar

Method used

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  • Hopkinson pressure bar test device
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  • Hopkinson pressure bar test device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Taking the compression test of the Hopkinson compression rod device with a diameter of Φ37mm as an example, the Hopkinson compression rod test device is described in detail. And give the experimental comparison data with the conventional device.

[0038] The diameter of the loading rod is Ф37mm, the length of the incident rod 3 is 2m, the length of the transmission rod 5 is 2m, and the length of the absorption rod 6 is 1m.

[0039] Sample 4 is made of fiber-reinforced resin-based composite material with a length of l 0 = 12mm, diameter d 0 =22mm, the Poisson's ratio of the material is μ=0.33. The expected compressive strain value is 5%.

[0040] The length of the bearing ring is calculated by formula (1) l 1 =11.4mm; outer diameter: Ф37mm, inner diameter calculated by formula (2) d 1 greater than 22.36mm, considering the deformation and failure characteristics of composite materials, the inner diameter d 1 Take 23mm.

[0041] Fixed sleeve: inner diameter Ф37.15mm...

Embodiment 2

[0046] In this embodiment, the compression test of the Φ100mm large-diameter Hopkinson compression rod device is taken as an example to describe the Hopkinson compression rod test device in detail.

[0047] The diameter of the loading rod is Ф100 mm, the length of the incident rod 3 is 5 m, the length of the transmission rod 5 is 5 m, and the length of the absorption rod 6 is 2 m.

[0048] The material of sample 4 is dimension reinforced resin matrix composite material, and the length of sample 4 is l 0 = 40mm, diameter is d 0 =60 mm, the Poisson's ratio of the sample 4 material is μ=0.33. The expected compressive strain value is 1.5%.

[0049] The length of the bearing ring is calculated by formula (1) l 1 =39.4mm; outer diameter: Ф100mm, inner diameter calculated by formula (2) d 1 greater than 60.3mm, considering the deformation and failure characteristics of composite materials, the inner diameter d 1 Take 62mm.

[0050] Fixed sleeve: inner diameter Ф100.15mm, outer ...

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Abstract

The invention belongs to the technical field of testing. On the basis of a Hopkinson pressure bar test device, a bearing ring sleeved between an incidence bar and a transmission bar is introduced to bear impact load after a sample reaches expected strain, and accurate control of compressive strain is realized. The related Hopkinson pressure bar test device comprises an emission device (1), a strike bar (2), the incidence bar (3), the transmission bar (5), an absorption bar (6) and a data acquiring and processing system, a strain control structure consisting of the bearing ring (8) and a fixing sleeve (7) is arranged between the incidence bar and the transmission bar; the outer diameter of the bearing ring is equal to those of the incidence bar and the transmission bar, and the fixing sleeve is in clearance fit with the bearing ring, the incidence bar and the transmission bar; the bearing ring is sleeved in the middle of the fixing sleeve. The test device is simple and convenient to operate, can realize controllable compressive strain amount and is applicable to dynamic mechanical property test and destruction morphology analysis under a fixed compressive strain condition, particularly to large-aperture Hopkinson pressure bar tests.

Description

technical field [0001] The invention belongs to the technical field of testing, and relates to material dynamic mechanics experiment technology, in particular to the compression strain control technology of Hopkinson compression bar test. Background technique [0002] In many cases, the load on materials and their structural components during application is impact loading, and the mechanical properties of most materials under impact loads are significantly different from those under quasi-static conditions. The dynamic mechanics of materials under impact loading Characteristic is an important parameter of mechanical properties for material application, and it is of great significance to carry out the test and analysis of the mechanical properties of materials under impact loads for the development of materials and the design of components. [0003] The one-dimensional Hopkinson bar test device is currently the main test method for testing and characterizing the dynamic mecha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/30
CPCG01N3/30Y02E30/30
Inventor 冯家臣彭刚王绪财王伟陈春晓高波王从科
Owner SHANDONG NON METALLIC MATERIAL RES INST