Residual stress introduced CT sample stress field and crack propagation analysis method

A technology of residual stress and crack propagation, which is applied in the direction of improvement of process efficiency, CAD numerical modeling, special data processing application, etc. It can solve the problems of unclear distribution law, difficulty in dealing with residual stress, and unknown residual stress.

Active Publication Date: 2021-02-02
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Failure is the biggest problem that materials need to face in the application process, so many scholars focus on the crack initiation and propagation behavior of materials, but in the research of numerical simulation, how to deal with residual stress is still a big problem
Zhu Yongmei et al. from the School of Mechanical Engineering, Jiangsu University of Science and Technology (Zhu Yongmei, Yao Xiang, Yang Linfeng, Wang Fang, Zhang Jian. Research on the influence of stress intensity factors on the surface cracks of deep-sea spherical shells[J]. Ship Mechanics, 2020,24(03):371- 379.) Established the calculation model of ...

Method used

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  • Residual stress introduced CT sample stress field and crack propagation analysis method
  • Residual stress introduced CT sample stress field and crack propagation analysis method
  • Residual stress introduced CT sample stress field and crack propagation analysis method

Examples

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Effect test

Embodiment 1

[0090] The simulation of the influence of residual stress on the stress intensity factor of superalloy CT specimens, the specific method of this implementation example includes the following steps:

[0091] (1) Establish the geometric model of CT specimen for superalloy stress intensity factor analysis, specifically:

[0092] Set up geometric model in part module, the size of CT sample is all set to a=20mm among the present invention, W=40mm, W 1 =50mm, F=11mm, D=5mm, H=25mm, partition the model and set the crack length to 3mm, the shape and size of the CT sample are as attached figure 1 , where the unit is mm;

[0093] Define material property parameters in the property module, select elastic properties, Young's modulus is 215GPa, Poisson's ratio is 0.29;

[0094] Assemble the model in the assembly module and set the model as independent;

[0095] Create a static general analysis step in the step module, set the time to 1s; set the increment to automatic type, set the init...

Embodiment 2

[0115] The simulation of the influence of residual stress on the crack propagation behavior of superalloy CT specimens, the specific method of this implementation example includes the following steps:

[0116] (1) Establish a CT sample model for crack growth analysis of superalloys, specifically:

[0117] The geometric model is established in the part module. The basic size of the CT sample is the same as that of Example 1. The difference is that the crack in this example needs to be established separately. The geometric model is selected by using a two-dimensional deformable body and a straight line with a length of 3mm.

[0118] Define material property parameters in the property module, including elastic properties and damage parameters. The elastic properties are the same as in Example 1. Check the maximum principal stress damage (Maxps damage) in the damage criterion, and set the value to 1.202E 9 , the damage evolution criterion is set to determine the damage according ...

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Abstract

The invention relates to a residual stress introduced CT sample stress field and crack propagation analysis method, which comprises the following steps of: establishing a CT sample finite element model by adopting ABAQUS finite element analysis software, and endowing a CT sample with initial stress by a direct assignment method and a file input numerical method; and calculating a stress intensityfactor of the CT sample and carrying out finite element simulation analysis on crack propagation by applying a cloud picture integration and expansion finite element technology. According to the method, the influence of different stress conditions on the crack propagation trend is fully considered, the finite element model for precisely calculating the high-temperature alloy CT sample crack tip stress intensity factor with introduced residual stress and predicting the crack propagation law is obtained, and the influence of stress on the crack propagation trend is effectively predicted; the simulation method can be widely applied to the field of aerospace, and a new thought is provided for research on prediction of residual stress and pretreatment on crack propagation behaviors.

Description

technical field [0001] The invention belongs to the numerical simulation method of fracture mechanics, and relates to the research on the stress intensity factor and expansion behavior of crack tips of superalloys for aerospace under different stresses. Specifically, it is a method for simulating the stress intensity factor and crack propagation of superalloy CT specimen crack tip with residual stress introduced. Background technique [0002] As an important material for aeroengine turbines, blisks and combustion chambers, superalloys have excellent durability and fatigue properties. The failure forms of superalloys are mainly fatigue fracture, stress corrosion, and oxidation cracking, that is, fracture failure under different conditions. Therefore, it is particularly important to study the crack propagation behavior of superalloys. The crack propagation behavior belongs to a very important aspect in the field of fracture mechanics. Fracture mechanics belongs to the field o...

Claims

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Application Information

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IPC IPC(8): G06F30/23G16C10/00G16C60/00G06F111/10G06F119/04G06F119/08G06F119/14
CPCG06F30/23G16C10/00G16C60/00G06F2111/10G06F2119/04G06F2119/08G06F2119/14Y02P10/20
Inventor 杨夏炜彭冲王艳莹马铁军张勇徐雅欣李文亚
Owner NORTHWESTERN POLYTECHNICAL UNIV
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