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Test device and method for testing material damage

A material damage and testing device technology, applied in measuring devices, using repetitive force/pulse force to test the strength of materials, analyzing materials, etc. High sensitivity effect

Pending Publication Date: 2020-05-22
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, some progress has been made in the damage research of materials, but the concealed impact damage is often overlooked because it is difficult to be found by the naked eye, or in the damage research, it is only analyzed from the macroscopic wave velocity change or the microscopic image. There is no systematic research and analysis combining the two

Method used

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  • Test device and method for testing material damage
  • Test device and method for testing material damage
  • Test device and method for testing material damage

Examples

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Embodiment

[0049] In this embodiment, the research density is 2960kg / m 3, a granite specimen with an elastic modulus of 63.6GPa and a Poisson's ratio of 0.2 as an example, a test method and device for testing material damage are given. The operation process includes the following steps:

[0050] Step 1: prepare 9 groups of granite specimens, the specimen height is 100mm, and the standard cylindrical sample with a diameter of 50mm;

[0051] Step 2: Use the RSM-SY6 acoustic wave detector to measure the ultrasonic velocity of the prepared granite specimen before impact loading;

[0052] Step 3, use Philips Brilliance 16-slice high-end spiral CT machine to scan the prepared granite specimen before impact load;

[0053] Step 3: Use three different impact heights: 60cm, 80cm, and 100cm, and three different weights: 200g, 400g, and 600g to impact the concrete samples produced by the drop hammer impact device, and the cycle impact times are 1, 2, 3, 4, 5, 6 times, each trial repeated 3 times; ...

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Abstract

The invention discloses a test device and method for testing material damage. A drop hammer impact apparatus is ingeniously applied to simulate the impact effect of an impact load when the material damage characteristic is researched under the action of the impact load, so that the damage law of the material under the action of the impact load is more conveniently and quickly obtained. Ultrasonicdetection of impact damage has high sensitivity, and is conducive to comprehensive understanding of the destruction mechanism of a jointed rock mass under the action of the impact load. CT imaging iscarried out on a test piece before and after impact by applying a CT technology, the destruction range and the damage degree of the material under the action of the impact load are analyzed, and a basis is provided for further researching the damage mechanism of the material under an impact condition. Fatigue degradation of the material is diagnosed macroscopically and microscopically, and the long-term stability of the material in engineering is scientifically evaluated.

Description

technical field [0001] The invention belongs to the field of building material engineering, and in particular relates to a test device and method for testing material damage. Background technique [0002] The working mechanism of building material impact damage is quite complex, and the safety assessment after damage lacks quantitative basis, and the lack of quantitative and rational analysis of the assessment will lead to hidden dangers in the project. With the continuous development of my country's infrastructure, many projects in construction projects are often disturbed by impact loads, such as underground chamber tunnel excavation, subway construction, geological structure movement, and building materials that cannot be installed and used. To avoid a certain degree of damage and damage to the building due to the impact load, thus threatening the stability of the project. [0003] Under the impact load of building materials, internal cracks continue to develop, damage ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/34G01N29/07G01N23/046
CPCG01N3/34G01N29/07G01N23/046G01N2203/0005G01N2203/0073
Inventor 柴少波王昊井彦林周涛史杰辉温馨
Owner CHANGAN UNIV
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