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Creep data screening method based on statistical test and state check

A creep data and screening method technology, applied in chemical statistics, chemical data mining, manufacturing computing systems, etc., can solve the problem of not considering the actual distribution of creep data, and the value range is difficult to meet the evaluation requirements of various engineering materials issues such as improving reliability and accuracy, meeting evaluation requirements, improving screening efficiency and the effect of

Active Publication Date: 2021-08-24
RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above data screening methods do not consider the actual distribution of creep data of different types of materials, and the specified value range is difficult to meet the evaluation requirements of various engineering materials under different design indicators

Method used

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  • Creep data screening method based on statistical test and state check
  • Creep data screening method based on statistical test and state check
  • Creep data screening method based on statistical test and state check

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A 7-series high-strength aluminum alloy pre-forged billet (T6 state) was selected as the research object. The sampling direction of the creep sample was the inner radial direction of the billet (perpendicular to the forging direction of the pre-forged billet). The sample size refers to GB / T 2039-1997 "Metal Tensile Creep and Endurance Test Methods". The experimental temperature levels are 40°C, 60°C, 70°C, 75°C, and 80°C, respectively, and the experimental stress levels are 6.

[0041] (i) Before the creep test, record the state parameters of the sample, such as group batch, surface quality, and processing accuracy: After inspection, it is confirmed that the batch of samples is taken from the same batch of pre-forged blanks, the sampling direction is consistent, and the surface is smooth and not obvious. Defects, machining accuracy meet the requirements of the national standard, after the completion of the creep experiment, a total of 18 original steady-state creep rate...

Embodiment 2

[0047] The 316H stainless steel plate was selected as the research object, and the sampling direction of the creep specimen was the extrusion direction in the plate, and the specimen size was referred to GB / T 2039-1997 "Metal Tensile Creep and Endurance Test Method". The experimental temperature levels were 500°C, 550°C, 600°C, 650°C, 700°C, 750°C, and 800°C, and the experimental stress levels exceeded 10.

[0048] (i) State parameters such as batching, surface quality, and machining accuracy of the samples were recorded before the creep test: after inspection, it was confirmed that the samples of this batch were taken from 3 different batches of extruded plates, the sampling direction was consistent, and the surface was smooth No obvious defects were found, and the processing accuracy met the requirements of the national standard; after the creep test was completed, a total of 63 original creep rupture time data t were obtained 实测 , see the data distribution Figure 5 .

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Embodiment 3

[0054] The 316 stainless steel material is selected as the research object, and the sample size refers to GB / T 2039-1997 "Metal Tensile Creep and Endurance Test Methods". The experimental temperature levels are 500°C, 550°C, 600°C, 650°C, 700°C, and 750°C, respectively, and the experimental stress levels exceed 10.

[0055] (i) Before the creep test, record the state parameters of the sample, such as batching, surface quality, and processing accuracy: after inspection, it is confirmed that the batch of samples is taken from two different batches of plates and bars, and the creep samples The sampling direction is the extrusion direction of the plate or bar, the surface is smooth and no obvious defects are found, and the processing accuracy meets the requirements of the national standard. After the creep experiment is completed, a total of 41 original creep data are obtained, which are the creep time t corresponding to 1% of the creep strain 实测 , see the data distribution Fig...

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Abstract

The invention discloses a creep data screening method based on statistical test and state inspection, which comprises the following steps: step 1, recording sample state parameters, and carrying out a creep experiment to obtain actually measured creep data; step 2, substituting the creep data into the creep constitutive model, fitting to obtain a creep constitutive equation in a corresponding form, and fitting to obtain a predicted value; step 3, calculating a function difference value [delta]f(x) between the actually measured creep data and a predicted value, and checking a statistical distribution rule of the [delta]f(x); step 4, according to a set saliency level alpha, searching for an outlier in the [delta]f(x) data, marking the actually measured creep data corresponding to the outlier as invalid actually measured creep data, and removing the invalid actually measured creep data; and step 5, repeating the steps 2-4 until all the remaining actually measured creep data do not have the outliers any more. According to the method, the flexibility of data screening is improved, the difficulty of subsequent material creep performance calculation and evaluation work is reduced, and the reliability and accuracy of creep performance prediction are improved.

Description

technical field [0001] The invention belongs to the technical field of material performance data processing, and in particular relates to a creep data screening method based on statistical inspection and state inspection. Background technique [0002] Creep deformation due to material aging accounts for a large proportion of failure accidents of long-term mechanical equipment components. According to the operating conditions of components, evaluating the creep durability of materials is a necessary means to ensure the safe operation of equipment components during their service life. Accurate creep data is an important basis for long-term material performance characterization evaluation, component reliability design and equipment failure diagnosis. However, due to the influence of the material of the component, the accuracy of the experimental control, and the processing accuracy of the sample, the dispersion of the creep data is usually large. The creep data with large dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16C20/70G16C60/00
CPCG16C20/70G16C60/00Y02P90/30
Inventor 李昂高蔚吴福张毅
Owner RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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