Method for determining load-life curve and working life of component

A technology of working life and life curve, applied in the direction of applying repetitive force/pulsation force to test the strength of materials, can solve the problems of high cost, high test cost, narrow application range of test data, etc., and achieve the effect of saving time and low cost

Active Publication Date: 2009-12-09
SHENZHEN BLUENET
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  • Summary
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AI Technical Summary

Problems solved by technology

Both the program fatigue test method and the random fatigue test method are only confirmatory test methods, and the load-life curve of the component cannot be determined. One test result can only be applied to the component under a certain working condition, and the random fatigue test must use Expensive random fatigue testing machine, high test cost
It can be seen that the component fatigue test method in the prior

Method used

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  • Method for determining load-life curve and working life of component
  • Method for determining load-life curve and working life of component
  • Method for determining load-life curve and working life of component

Examples

Experimental program
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Example Embodiment

[0032] The method of using infrared thermal imaging technology to quickly determine the component load-life curve and estimate the working life of the component according to the curve provided by the present invention includes the following steps:

[0033] First, according to the existing mechanical parameters of the component material (such as the tensile strength or fatigue limit of the component material), the fatigue limit of the component is preliminarily estimated, and the load spectrum of the component under actual working conditions is compiled statistically.

[0034] Then, a constant amplitude fatigue test was started on the component below 20% of the estimated fatigue limit of the component, and the infrared camera was used to observe the temperature change on the surface of the component in real time during the test.

[0035] When the temperature is stable, increase the test load to continue the test. The load increase refers to the material properties of the component ...

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Abstract

The invention discloses a method for estimating the service life of a component, which comprises the following steps: a, preliminarily estimating the fatigue limit of the component and counting the load spectrum of the component under an actual working condition; b, starting to perform constant amplitude cyclic loading on the component at a degree of less than 20 percent of the estimated fatigue limit, performing a fatigue test on the component, and measuring the temperature change on the surface of the component in the test process in real time by using an infrared video camera; c, when temperature on the surface of the component is stable, increasing the test load to continue the test, wherein a stage with stable temperature exists at each level of the load, the test load is increased until the component is destroyed when the stage is achieved, and then the test is finished; d, calculating the fatigue life of the component at each level of stress to further draw a stress-life curve of the component; and e, searching the fatigue life of each load in the load spectrum from the stress-life curve, and calculating the service life of the component through a formula.

Description

technical field [0001] The invention relates to a method for estimating the working life of a component, in particular to a method for quickly determining the load-life curve of a component by using infrared thermal imaging technology, and estimating the working life of the component according to the curve. Background technique [0002] The method of determining the load-life curve of a component in the prior art is the same as the traditional method of determining the stress-life curve of a material. The life of one or a group of test pieces is measured at a certain load level, and the components under different load levels are obtained through a series of tests. Fatigue life, thereby drawing the load-life curve. In this method, a test piece can only be tested at one level of load, and each level of load must be tested until the test piece is destroyed, which takes a long time, requires a large number of components, and is costly. [0003] Most of the loads of actual compo...

Claims

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Application Information

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IPC IPC(8): G01N3/32
Inventor 丁桦
Owner SHENZHEN BLUENET
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