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Method for predicting tensile strength of nickel-base superalloy gap

A nickel-based high-temperature alloy, tensile strength technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as unsatisfactory matching, achieve the effect of precise strength limit and ensure accuracy

Inactive Publication Date: 2016-09-07
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] Although scholars at home and abroad have done research on the prediction method of the notched tensile strength of alloy materials, the agreement between the prediction results of nickel-based alloy materials and the actual test results is not ideal.

Method used

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  • Method for predicting tensile strength of nickel-base superalloy gap
  • Method for predicting tensile strength of nickel-base superalloy gap
  • Method for predicting tensile strength of nickel-base superalloy gap

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Embodiment

[0066] The present invention takes nickel-based superalloy GH4169 double-sided notched flat plate sample as an example, and predicts the notched tensile strength of the notched sample with a thickness of 0.75 mm and a notch radius of 3 mm at room temperature. Sample drawings and physical pictures such as figure 1 As shown, the dimensions in the figure are: h1=100mm, h2=35mm, h3=3mm, Φ=12mm, R1=10mm, R2=0.75mm, R3=3mm.

[0067] (1) In order to obtain accurate material properties, that is, the engineering stress-strain curve of the material, it is necessary to conduct a smooth sample tensile test first, and the sample drawings and photos are as follows: figure 2 shown.

[0068] During the actual tensile test, the deformation of the notched specimen is mainly concentrated in the root region of the notch, resulting in that the actual tensile strain rate of the material in the local region of the notch will be much greater than the nominal strain rate of the test load, which will...

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Abstract

The invention discloses a method for predicting tensile strength of nickel-base superalloy gap. The method includes the following steps: acquiring an attribute parameter of a material to be tested through an experiment; performing secondary development on finite element software, and implanting an Hosford yield criterion and a required material hardening constitutive model into the finite element software; defining the material attribute in the finite element software; performing 3-dimensional finite element partition on a gap test model in the finite element software; applying constraint and displacement load on the finite element model; setting a solver; performing solution to acquire a finite element calculation result; extracting the reaction force of each node of an end surface of the finite element model and accumulating the reaction forces in a time postprocessor so as to acquire a load value of each time step; multiplying a Time value by an applied total displacement value to acquire a displacement value of each time step; and turning the result into a load-displacement curve. The method adopts the yield criterion and a failure criterion suitable for nickel-base superalloy, and then the ultimate strength of a gap can be accurately predicted.

Description

technical field [0001] The invention belongs to the technical field of material testing methods, and in particular relates to a method for predicting the notched tensile strength of nickel-based superalloys based on the Tresca yield criterion and the plastic instability failure criterion. Background technique [0002] Nickel-based superalloy is a kind of superalloy with nickel as the matrix, which has high strength and good oxidation resistance and gas corrosion resistance in the range of 650-1000 °C. Its good organizational stability and coherent ordered A 3 The B-type intermetallic compound acts as a strengthening phase to effectively strengthen the alloy. Therefore, nickel-based superalloys are widely used in aeroengines, especially as turbine disk materials with the most severe working environment. [0003] During the high-speed working process of the aero-engine wheel, the strength performance requirements of the material are relatively strict, and it is required to wi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 胡绪腾王浩然宋迎东
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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