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Impacting ball-pressure testing and evaluation method of engineering material

A technology of ball pressure test and engineering materials, applied in the direction of testing material hardness, measuring devices, instruments, etc., can solve problems such as structural failure, unprofessional testing process, and increase surface physical properties

Inactive Publication Date: 2017-02-22
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the existence of many initial microcracks and defects in the widely used engineering materials, when there is an acidic medium in the environment, the internal defects of the material will further increase and the physical properties of the surface will decrease.
In addition to being eroded by chemical and biological media in the surrounding environment during service, the erosion and wear of granular media on the surface materials of infrastructure cannot be ignored. This erosion is mainly reflected in the erosion of the surface damage area under the action of physical and chemical cycles. Expansion merges, eventually leading to structural failure, seriously affecting the durability and security of the infrastructure
[0003] The quality of engineering materials directly affects the quality of engineering materials, and the abrasion and erosion of engineering materials by environmental media can be detected by impact ball pressure tests. Observation, comprehensive evaluation to obtain a reasonable test result, so as to rigorously evaluate whether the tested engineering material specimens can meet the actual working conditions, but the current commonly used impact test methods are mostly focused on high-energy impact tests, and for There is no complete set of test methods for engineering materials subjected to impact ball pressure tests of small energy particles in the actual service process. The specifications of material samples, sample surface properties, and sample surface evaluation indicators are not clearly defined. The test process mainly It is done by experience, which will seriously affect the test results, the test process is not professional, and cannot meet the current needs

Method used

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  • Impacting ball-pressure testing and evaluation method of engineering material
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  • Impacting ball-pressure testing and evaluation method of engineering material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A rigid sphere of mass m, radius R, modulus of elasticity, Poisson's ratio is in contact with a specimen of modulus of elasticity E, Poisson's ratio. Under the action of impact load, the maximum value of the normal vertical load of the contact point on the surface of the material is shown in formula (1):

[0046] ;

[0047] is the relative velocity of the ball head before it touches the surface of the material, is the effective elastic modulus of the contact system:

[0048] ;

[0049] The maximum contact radius is:

[0050] ;

[0051] During the impact process of the cement mortar sample, the dynamic hardness value can reflect the ability of different materials to resist deformation, r is the radius of the measured indentation value, F is the collected impact load value, and the dynamic hardness value The calculation formula is:

[0052] ;

[0053] In the formula, .

[0054] All the energy of the ball head before the impact is kinetic energy, and ...

Embodiment 2

[0060] Such as figure 1 As shown, and selected concrete, mortar and cement stone samples cured for 56 days, the impact ball pressure test was carried out with these three samples as examples. First, prepare a 100mm×100mm×100mm cube test block according to the calculated mix ratio. After 24 hours of molding, the sample is removed from the mold and placed in a standard curing room for 56 days of curing. Then the sample is taken out. Since the three samples are all multi-phase composite materials, the surface is relatively rough, which will affect the reading of the impact load value of the ball head during the impact test, so the TLD-SM-2 grinding wheel is used before the impact ball pressure test The grinding machine performs strict grinding and polishing on the concrete sample. Since there is a layer of cement slurry on the surface of the sample, if the grinding thickness is too thin, the indentation value will be affected. If the grinding thickness is too large, the large sto...

Embodiment 3

[0062] The polished and polished three samples were immediately placed in a 45°C oven to dry for 24 hours, and then the impact ball pressure test was performed. The 6 faces of the concrete sample correspond to one impact height, and 6 impact points are set for each face, and the sample is fixed on the fixture of the automatic ball pressure impact instrument to prepare for the impact ball pressure test. Open the impact ball pressure test software on the programming software, select a new file, and select the number of sample blocks, the number of impact ball pressure sample surfaces and the number of impact points from each impact surface, and then start the impact ball pressure test.

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Abstract

The invention belongs to the technical field of engineering material detection and in particular relates to an impacting ball-pressure testing and evaluation method of an engineering material. An impact load and an impact indentation radius are obtained through an impacting ball-pressure test, so that the plasticity resistance, deformation capability, elasticity recovery capability, surface dynamic elastic modulus and shear modulus of the engineering material are analyzed; the impacting ball-pressure testing and evaluation method comprises four parts including test sample treatment, impacting testing, three-dimensional shape inspection and data processing. Compared with the prior art, the impacting ball-pressure testing method provided by the invention can realize polishing on a test sample needing surface treatment; a self-researched automatic ball-pressure tester can be used for carrying out a small-energy impacting ball-pressure test, and shape changes of the test sample are analyzed by measuring a 3D (Three Dimensional) shape of a surface damaged region of the test sample through utilizing a laser confocal technology; finally, test sample surface mechanical properties including the plasticity resistance, deformation capability, elasticity recovery capability, surface dynamic elastic modulus and shear modulus and the like of the surface of the test sample are analyzed through corresponding software; finally, one set of complete impacting ball-pressure testing method of the engineering material is obtained.

Description

technical field [0001] The invention belongs to the technical field of engineering material detection, and in particular relates to an impact ball pressure test and an evaluation method of engineering materials. Background technique [0002] Due to the existence of many initial microcracks and defects in the widely used engineering materials, when there is an acidic medium in the environment, the internal defects of the material will further increase and the physical properties of the surface will decrease. In addition to being eroded by chemical and biological media in the surrounding environment during service, the erosion and wear of granular media on the surface materials of infrastructure cannot be ignored. This erosion is mainly reflected in the erosion of the surface damage area under the action of physical and chemical cycles. Expansion merges, eventually leading to structural failure, seriously affecting the durability and security of the infrastructure. [0003] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/40G01B11/24G01B11/08
CPCG01B11/08G01B11/24G01N3/40
Inventor 郝贠洪韩燕
Owner INNER MONGOLIA UNIV OF TECH
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