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Method for fatigue analysing and testing by refrared thermal imagery

A technology of fatigue analysis and infrared thermal imaging, which is applied in the direction of material analysis, material analysis, and application of stable tension/pressure to test the strength of materials through optical means, and can solve problems such as temperature changes that do not consider non-fatigue effects

Inactive Publication Date: 2006-11-29
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

However, in the process of Risitano method, non-fatigue effects such as temperature changes caused by viscosity are not considered

Method used

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  • Method for fatigue analysing and testing by refrared thermal imagery
  • Method for fatigue analysing and testing by refrared thermal imagery
  • Method for fatigue analysing and testing by refrared thermal imagery

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Embodiment Construction

[0020] The present invention is described in detail below:

[0021] Fatigue of materials is a process of energy dissipation. Temperature change is an important parameter to study the fatigue process. It can not only determine the location of fatigue damage, but also monitor its evolution intuitively. The amount of heat dissipation not only reflects the difference in the different damage processes of the material, but also reflects the irreversible characteristics of the material damage process.

[0022] The researchers concluded from a large number of experiments that the temperature change in the process of material fatigue can be divided into three distinct stages as follows: figure 1 As shown, ΔT is the maximum surface temperature T and room temperature T of the specimen under the action of cyclic load during the experiment 0 Difference. Experiments have found that under the condition of a certain load frequency, when the load exceeds the fatigue limit σ of the material ...

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Abstract

The invention discloses a method for fatigue analysis and detection by infrared thermal image, circularly loading test piece with different load levels, where the load is increased from low to high, the lowest load is not less than the minimum load value which makes the test piece raise temperature, and at each load level, number of circularly loading times is greater than that of circularly loading times which makes the test piece stably raise temperature, using the infrared thermal imager to measure surface temperatures at different times under different loads, processing the obtained data and obtaining two straight lines of different slopes, where the abscissa value corresponding to their intersection is fatigue limit of the test piece. And its analyzing result is more accurate and has wider application range.

Description

technical field [0001] The invention relates to a fatigue analysis method of a test piece, in particular to a fatigue analysis and detection method using infrared thermal images. Background technique [0002] Strength, stiffness and fatigue are the three basic requirements for engineering structures and machinery. There are two main methods for determining the fatigue life of structures and machinery: test methods and test analysis methods. In the traditional test method, the determination of fatigue life depends on a large number of tests, which directly obtain the required fatigue data through a large number of tests that are the same as or similar to the actual situation. This method is reliable, but often takes a long time and requires many test pieces, resulting in a long fatigue analysis cycle and high test costs, and its feasibility is greatly restricted. The test analysis method is to determine the fatigue life of the structure according to the analysis model based ...

Claims

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Application Information

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IPC IPC(8): G01N3/18G01N21/84
Inventor 丁桦刘浩曾伟
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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