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Experiment method and impact test device with dynamic tensile stress amplitude as variable

A technology of stress amplitude and dynamic stretching, which is applied in the field of impact dynamics, can solve problems such as the deviation of spall changes and affect the accuracy of plane impact experiments, and achieve the effect of improving accuracy

Inactive Publication Date: 2018-08-24
INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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  • Abstract
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Problems solved by technology

[0005] However, in the existing experimental process, it is found that there is a large deviation between the change of the spall caused by changing the collision velocity and the change of the theoretical tensile stress amplitude, which seriously affects the accuracy of the plane impact test.

Method used

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  • Experiment method and impact test device with dynamic tensile stress amplitude as variable
  • Experiment method and impact test device with dynamic tensile stress amplitude as variable

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Embodiment Construction

[0056] In the prior art, in order to facilitate the study of spalling phenomena, devices such as air cannons and electric cannons (dynamic tensile strain rate range 10 4 the s -1 ~10 7 the s -1 , the tensile stress duration is 100ns~5ms) to drive the flyer to collide with the sample, so as to realize the research on the evolution process of spall damage. In the experiment, the commonly used scheme is to change the shock wave intensity during the collision by changing the collision speed, so that the compressive stress after the shock wave changes, and finally realize the adjustment of the tensile stress amplitude.

[0057] However, in the existing experimental process, it is found that there is a large deviation between the spallation change caused by changing the collision velocity and the theoretical tensile stress amplitude change, which seriously affects the accuracy of the plane impact test.

[0058] The present invention provides an experimental method with dynamic te...

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Abstract

The invention provides an experiment method taking a dynamic tensile stress amplitude value as a variable and an impact experiment device and relates to the field of impact dynamics. The experiment method taking the dynamic tensile stress amplitude value as the variable comprises the following steps: S1. preparing a plurality of sample targets; S2. preparing a plurality of flying plate groups, wherein each flying plate group comprises a first flying plate layer and a second flying plate layer which is collided with the corresponding sample target; the first flying plate layers are fitted with the second flying plate layers and the resistance of each first flying plate layer is smaller than that of each second flying plate layer; S3. forming an impact experiment group by corresponding each flying plate group to one sample target; and S4. carrying out a collision experiment on each impact experiment group. In an experiment, experiment data of spallation caused by the single variable, which is controlled by the change of the dynamic tensile stress amplitude value, is only acquired, and the difficulty of theoretical analysis of a tensile stress amplitude value effect can be remarkably reduced. The invention further provides the impact experiment device.

Description

technical field [0001] The invention relates to the field of impact dynamics, in particular to an experimental method and an impact experimental device with dynamic tensile stress amplitude as a variable. Background technique [0002] Dynamic tensile test is an important experimental method in impact dynamics and dynamic high-pressure science. It has a broad application background in the study of dynamic tensile properties of materials and structural design. It is also the main technology for studying dynamic damage of materials under high pressure and high strain rate. one. Among them, impact dynamics is a branch of mechanics based on mechanics, materials science, and physics. The main research object is the dynamic behavior and structural characteristics of materials under impact loads, including the movement of material components under dynamic loads. , deformation, damage and failure. The main application fields are: blasting engineering, drilling and mining, mechanica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/307G01N1/28
CPCG01N1/28G01N3/307
Inventor 裴晓阳彭辉孔令尧于继东姚松林刘坤贺红亮李平柏劲松
Owner INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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