Arc length method nonlinear finite element analysis-based disc burst speed prediction method

A technology of fracture speed and prediction method, which is applied in special data processing applications, instruments, electrical digital data processing, etc., and can solve problems such as failure to meet engineering design needs and large error of fracture speed

Inactive Publication Date: 2017-02-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Engineering practice shows that the disc rupture criterion adopted by traditional methods (such as the average stress method) does not match the actual state of the disc when the disc reaches the ultimate rupture speed, and the error of the rupture speed is large, which cannot meet the needs of engineering design.

Method used

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  • Arc length method nonlinear finite element analysis-based disc burst speed prediction method
  • Arc length method nonlinear finite element analysis-based disc burst speed prediction method
  • Arc length method nonlinear finite element analysis-based disc burst speed prediction method

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Embodiment

[0055] In the present invention, the simulated roulette sample of the nickel-base superalloy GH4169 is taken as an example, and the rupture speed of the simulated roulette is predicted under room temperature conditions. Sample drawings and physical pictures such as Figure 1a and shown in b.

[0056] Step 1. In order to accurately predict the rupture speed of the GH4169 simulated disk, it is necessary to take samples from the simulated disk forging and test its mechanical properties and tensile stress-strain curve, that is, the engineering stress-strain curve of the material. The sample drawings and photos are as follows: Figure 2a As shown in and b, the dimensions in the figure are: h1'=100mm, h2'=28.39mm, h3'=30mm, Φ1=10±0.02mm, Φ2=5±0.02mm, R=10mm, Ra=0.8.

[0057] The GH4169 simulation disk is manufactured by free forging round cakes. After rough machining, direct aging heat treatment is used for heat treatment, and then it is finished according to the drawing to the fina...

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Abstract

The invention discloses an arc length method nonlinear finite element analysis-based disc burst speed prediction method. The method comprises the steps of sampling a disc material and obtaining constitutive model parameters of the material through an experiment; approximately estimating a burst speed of a disc by adopting a conventional method; defining an elastoplastic constitutive model of the disc in finite element software; building a three-dimensional finite element model of the disc material and performing mesh division; for a disc rotor finite element model needed to be calculated, applying constraint and rotary speed loads; performing large-deformation nonlinear finite element calculation by adopting an arc length method; and obtaining a rotary speed or angular speed-disc radial displacement curve in a time postprocessor after calculation, thereby obtaining an extreme critical rotary speed of the disc or a rotor, namely, the burst speed. According to the method, a more reasonable disc burst criterion based on arc length method nonlinear finite element analysis and global plastic instability is adopted, so that the extreme rotary speed of the disc or the rotor can be predicted more accurately.

Description

technical field [0001] The invention belongs to the technical field of material test methods, and in particular relates to a method for predicting the rupture rotational speed of a wheel disk based on the nonlinear finite element analysis of the arc length method and the overall plastic instability criterion. Background technique [0002] In an aero engine, the disc is one of the most important rotor components. For the turbine disk, it is still at a relatively high working temperature. Due to the thermal stress caused by uneven temperature distribution and the centrifugal load generated by high-speed rotation, the turbine disk is in an extremely harsh working environment. In order to ensure the normal service of the engine and the aircraft, the domestic and foreign gas turbine engine design criteria or specifications have made strict requirements and regulations on the strength of the disk, that is, the rupture speed performance. [0003] Therefore, the analysis of the rup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/23
Inventor 胡绪腾王浩然宋迎东
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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