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Dynamic load indentation testing method for metal materials

A technology of metal materials and dynamic loading, applied in the direction of analyzing materials, using stable tension/pressure to test material strength, testing material hardness, etc., can solve the problems of not being able to test other mechanics, and achieve the effect of simple structure

Inactive Publication Date: 2019-11-15
EAST CHINA UNIV OF SCI & TECH +1
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Problems solved by technology

If the elastic limit of the material is higher, the kinetic energy absorbed by plastic deformation will be less, and the rebound speed of the ball will be greater, indicating that the hardness of the material is higher, but this method can only test the hardness of metal materials, and cannot test other mechanics, such as Yield strength, tensile strength and other mechanical performance indicators

Method used

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  • Dynamic load indentation testing method for metal materials
  • Dynamic load indentation testing method for metal materials
  • Dynamic load indentation testing method for metal materials

Examples

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Embodiment

[0049] like figure 1 , a dynamic load indentation test method for metal materials, comprising the steps of:

[0050] (1) Utilize the impact pressure head mechanism 2 that is provided with the acceleration sensor 3 inside, the impact pressure head mechanism 2 lower end is provided with a spherical cemented carbide 4, vertically impacts the surface of the metal material 1 to be measured, and the impact process, the acceleration sensor 3 records the acceleration- time curve, a buffer spring 5 can also be set between the acceleration sensor 3 and the spherical cemented carbide 4 as required, when no spring is provided, the duration of the impact process is the shortest; when a spring is provided, the smaller the spring stiffness, the shorter the duration of the impact process long;

[0051] (2) Convert the obtained acceleration-time curve into the impact force-indentation depth curve, such as figure 2 shown;

[0052] (3) Repeat steps (1) and (2) to perform multiple dynamic ind...

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Abstract

The invention relates to a dynamic load indentation testing method for metal materials, comprising the following steps: (1) vertically impacting the surface of a metal material to be tested by using an impact pressure head mechanism provided with an acceleration sensor therein, and recording, by the acceleration sensor, an acceleration-time curve; (2) converting the obtained acceleration-time curve into an impact force-indentation depth curve; (3) performing multiple dynamic indentation tests of different impact forces to obtain a series of impact force-indentation depth curves; 4) convertingthe obtained impact force-indentation depth curves into characterization stress and characterization strain, and fitting a true stress-strain curve accordingly; and (5) figuring out the yield strengthand tensile strength of the metal material according to the true stress-strain curve. According to the dynamic load indentation testing method provided by the invention, the yield strength and tensile strength of the metal material are obtained by using the acceleration-time curve obtained by the acceleration sensor through steps one by one, and the detection efficiency of the metal material is greatly improved by the method.

Description

technical field [0001] The invention relates to the technical field of material analysis and testing, in particular to a dynamic load indentation testing method for metal materials. Background technique [0002] There are a large number of service equipment in thermal power, nuclear power, offshore oil and gas, petrochemical and other industries, and nearly 80% of them are pressure vessels and pipelines. These equipments have long-term service in the harsh environment of high temperature, high pressure, low temperature, neutron radiation or corrosive media, which is easy to cause deterioration and damage of material properties. To evaluate the performance of materials, it is necessary to remove some metal samples from the equipment for testing, which will destroy the original structure of the equipment and affect the safety of the equipment. On the premise of not destroying the equipment, how to quantitatively characterize the mechanical properties of metal materials of in-...

Claims

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Application Information

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IPC IPC(8): G01N3/48G01N3/08
CPCG01N3/08G01N3/48G01N2203/0003G01N2203/0017G01N2203/0075G01N2203/0082G01N2203/0252G01N2203/0682
Inventor 关凯书章骁程钟继如王琼琦徐彤王汉奎
Owner EAST CHINA UNIV OF SCI & TECH
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