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Prediction method for creep damage and deformation evolution behavior along with time

A technology of time evolution and prediction method, which is applied in the direction of testing the strength of materials by applying stable tension/pressure, which can solve the problems of difficulty in quantifying creep damage, lack of clear definition of correlation, and difficulty in continuous characterization, etc. The effect of low cost, strong interpolation and extrapolation capabilities, and few parameters

Pending Publication Date: 2022-04-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, due to the complexity and variety of creep damage forms, it is difficult to quantify the creep damage, to continuously characterize the damage during the creep process, and to describe the evolution behavior of creep deformation over time.
In addition, the existing creep models are often described for a single curve, and the fitting parameters have a strong stress-temperature correlation. This correlation is not clearly defined, and it is difficult to achieve reliable extrapolation

Method used

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  • Prediction method for creep damage and deformation evolution behavior along with time
  • Prediction method for creep damage and deformation evolution behavior along with time
  • Prediction method for creep damage and deformation evolution behavior along with time

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Embodiment

[0080] In this embodiment, the creep damage and deformation prediction method of the present invention is applied to the creep damage and deformation prediction of the nickel-based superalloy GH4169 material, including the following steps:

[0081] (1) The high temperature tensile test of GH4169 material was carried out at 600°C and 650°C, and the corresponding tensile strengths were 1440MPa and 1255MPa respectively.

[0082] (2) Carry out high-temperature creep tests of GH4169 material under 6 different stress values ​​at 600°C and 650°C respectively, and obtain the corresponding creep strain curve and minimum creep rate and the creep life t f . The specific test plan and the obtained test data are shown in Table 1.

[0083] Table 1 GH4169 material creep test scheme and data

[0084]

[0085] (3) Using the formula Linear fit at 600°C and 650°C, respectively -σ data, the stress value corresponding to the intersection of the fitting line and the X-axis is the threshold...

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Abstract

The invention discloses a method for predicting creep damage and deformation evolution behaviors along with time, which comprises the following steps of: obtaining tensile strength sigma b through a high-temperature tensile test of a material; a corresponding creep strain curve, the minimum creep rate and the creep life tf are obtained through a high-temperature creep test; obtaining threshold stress sigma corresponding to different temperatures; establishing a function relationship between the tensile strength sigma b and the temperature T and between the threshold stress sigma th and the temperature T; respectively establishing a minimum creep rate and creep life tf prediction formula based on the threshold stress sigma and the tensile strength sigma ; establishing a creep damage constitutive model, wherein the creep damage constitutive model comprises a strain rate formula and a damage rate formula; obtaining an evolution behavior of strain deformation along with time by solving a strain rate formula; and obtaining the evolution behavior of the damage along with time by solving a damage rate formula. According to the method, the defect that a traditional creep damage constitutive model is difficult to extrapolate is overcome, accurate extrapolation can be achieved, and the prediction precision is high.

Description

technical field [0001] The invention relates to a method for predicting the evolution behavior of creep damage and deformation with time, in particular to a method for predicting the evolution behavior of creep damage and deformation with time by using a constitutive model of creep damage. Background technique [0002] High-temperature components work in a high-temperature environment for a long time, and are prone to creep deformation, accompanied by creep damage. Creep damage includes voids, cracks, coarsening of deposits, phase transformation of strengthening phases, oxidation, and corrosion. However, due to the complexity and variety of creep damage forms, it is difficult to quantify creep damage, to continuously characterize the damage during the creep process, and to describe the evolution behavior of creep deformation over time. In addition, the existing creep models are often described for a single curve, and the fitting parameters have a strong stress-temperature c...

Claims

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Application Information

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IPC IPC(8): G01N3/18
CPCG01N3/18
Inventor 宋迎东赵旭孙志刚牛序铭
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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