Method for evaluating micro-defect working stress of large casting and forging

A technology of working stress and casting and forging, which is applied in special data processing applications, instruments, electrical digital data processing, etc., and can solve problems such as distortion of calculation results

Active Publication Date: 2021-01-22
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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Problems solved by technology

In addition, most of the current schemes dealing with near-singular integrals and singular integrals are aimed at boundary elements with relatively regular shapes. However, for large-scale casting and forging structures with micro-defects, elements with narrow and long structures are often unavoidable. If no special treatment is performed, the calculation the result will be distorted

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  • Method for evaluating micro-defect working stress of large casting and forging
  • Method for evaluating micro-defect working stress of large casting and forging
  • Method for evaluating micro-defect working stress of large casting and forging

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Embodiment Construction

[0070] The present invention will be further described below in conjunction with specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not as a limitation to the present invention.

[0071] like figure 1 As shown, the present embodiment takes the microdisk (radius a=1.0) defect in a cube casting and forging (20×20×20) as an example:

[0072] Application step 1: Use ultrasonic detection technology on cube castings and forgings to obtain the size, position and nature of defects in the micro-discs (radius a=1.0) in the cube castings and forgings, and establish the micro-circles in the square castings and forgings (20×20×20) Calculation model of disk (radius a=1.0) defects, the body diagonal coordinate points of cube casting and forging are (-10, -10, -10) and (10,10,10), and the center of micro-disc is (0 ,0,0), with a radius of 1.0.

[0073] Application step 2: mesh discretization, the outer sur...

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Abstract

The invention relates to a method for evaluating micro-defect working stress of a large-scale casting and forging, which comprises the following steps of: obtaining the size, position and shape of a defect in a large-scale casting and forging structure by using an ultrasonic detection technology, establishing a calculation model of the large-scale casting and forging structure with the defect, andcorrecting a dual reciprocal boundary integral equation. The method has the advantage that only one crack surface is discrete in a displacement discontinuity method, and also has the universality advantage of a traditional dual boundary element method. In the application of the large-scale casting and forging structure, corresponding stress and stress intensity factors can be obtained only by inputting the calculation grid model of the large-scale casting and forging structure with defects, corresponding material parameters, boundary conditions, unit types and concerned areas, and display analysis is carried out.

Description

technical field [0001] The invention relates to the field of work stress evaluation of large casting and forging parts, in particular to the work stress evaluation of casting and forging parts with micro-defects such as cracks and sand inclusions. Background technique [0002] In the field of heavy equipment, due to the large size of the equipment and the complex stress state, many key parts are manufactured by casting and forging methods, and the ratio of external dimensions to wall thickness reaches 10-50. During the manufacturing process, small defects such as cracks and sand inclusions are often left locally. When using the finite element method to calculate the working stress of castings with defects, because of the large gap between the characteristic dimensions, in order to ensure the convergence of the calculation results, it is necessary to distribute a large number of calculation grids at the defect positions, especially for castings containing a large number of tin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F30/20G06F119/14
CPCG06F30/17G06F30/20G06F2119/14
Inventor 谢贵重李浩钟玉东李客孙春亚王昊琪杜文辽王良文邬昌军文笑雨刘林张世欣王滔
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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