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Method for processing material fatigue life test data

A fatigue life and test method technology, applied in the direction of analyzing materials, measuring devices, instruments, etc., can solve problems such as low efficiency and achieve the effect of avoiding fatigue life

Active Publication Date: 2012-11-28
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

When the data processed in this way is applied to structural design such as aircraft engines, it will cause inefficiency

Method used

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  • Method for processing material fatigue life test data
  • Method for processing material fatigue life test data
  • Method for processing material fatigue life test data

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Experimental program
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Embodiment

[0029]First, in step S1, referring to the "Metal High Temperature Rotating Bending Fatigue Test Method", the rotating bending fatigue test is carried out on the aviation titanium alloy B through the rotating bending fatigue testing machine. The loading method is cantilever rotation and bending, the speed of the testing machine is 5000 rpm, and the number of rotations is automatically recorded by the counter. The test temperature is 300°C. Different stress levels were selected for testing to obtain a total of 21 data pairs numbered from 1 to 21. Each data pair includes stress value and life Nf, as shown in Table 1 below. Among them, serial numbers 14, 15, 19, 20, and 21 are overflow point data. A stress-life diagram is drawn from these data pairs. exist figure 2 In the stress-life diagrams shown, the breaking point is given by the solid circle and the overflow point is given by the box. And mark the number of overflow points on the box.

[0030] Table 1

[0031] ...

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Abstract

The invention belongs to a material fatigue life test technology and relates to a method for processing material fatigue life test data. The method is characterized by comprising the following processing steps of: finding out the fatigue limit of a material; preprocessing the fatigue life data; and finding out an intercept B1 and a slope B2 in a fatigue life curve. The invention provides a quite rational method for processing the material fatigue life test data, thereby avoiding the waste of the data obtained at high cost and underestimation of the fatigue life of the material.

Description

technical field [0001] The invention belongs to material fatigue life test technology, and relates to a processing method for material fatigue life test data. Background technique [0002] Materials exhibit fatigue phenomena under alternating loads such as axial loading, rotational bending loading, and torsional loading. The stress-life (S-N) equation is a common means to characterize the fatigue strength of materials under stress-controlled loading conditions. The S-N equation is usually obtained through the following steps: under different stress levels, the fatigue test is carried out on the material sample on the fatigue testing machine, and the fatigue data pair of the stress level data and the fatigue life data of the sample are obtained; then, the following is used: The method described above processes the obtained fatigue life-stress data pairs to obtain S-N curves and equations. see figure 1 , which gives an example of a routine approach to fatigue data pair proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/00
Inventor 李影于慧臣
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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