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Fracture toughness analysis method for pressure-bearing main equipment and chemical machinery pressure-bearing equipment of nuclear power plant

A technology for chemical machinery and pressure-bearing equipment, applied in design optimization/simulation, testing material strength using stable tension/pressure, special data processing applications, etc. problems, to achieve the effect of improving economy and calculation efficiency, increasing the probability of fracture occurrence, and improving accuracy

Pending Publication Date: 2021-04-30
HARBIN ELECTRIC POWER GENERATION EQUIP NAT ENG RES CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For the current method of preventing pressure vessel fracture, there is no clear judgment and calculation method. In China, GB / T150 is generally used to prevent low-temperature brittle fracture from material selection and low-temperature and low-stress conditions, and from the design, and there is no judgment from numerical simulation. Whether there is a possibility of fracture; foreign standards only put forward the inspection results and load values ​​during the regular inspection to determine whether the crack expands to determine the failure of the equipment, and do not consider and give suggestions from the source of design

Method used

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  • Fracture toughness analysis method for pressure-bearing main equipment and chemical machinery pressure-bearing equipment of nuclear power plant
  • Fracture toughness analysis method for pressure-bearing main equipment and chemical machinery pressure-bearing equipment of nuclear power plant
  • Fracture toughness analysis method for pressure-bearing main equipment and chemical machinery pressure-bearing equipment of nuclear power plant

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Experimental program
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specific Embodiment approach

[0081] Specific implementation method: according to the requirements of imaginary defects, for a section with a thickness from 100mm to 300mm, the imaginary defect depth (a) is 1 / 4 of the section thickness, and the length (2c) is taken as 1.5 times the section thickness, that is, the aspect ratio is ( 2c / a=)6:1, the defect is assumed to be on the inner and outer surfaces; for a section greater than 300mm thick, the imaginary defect of the 300mm thick section is used; for a section less than 100mm thick, the hypothetical defect depth is conservatively assumed to be 25mm. The cross-sectional size of the combined path P01 is 80.4 mm, which is less than 100 mm, so the imaginary maximum defect depth is taken at 25 mm from the inner and outer surfaces, that is, the surface crack refers to the cross-sectional thickness where the crack depth (a) is less than 0.7 times; the deep buried crack refers to the crack depth (2a ) is less than 0.7 times the section thickness, otherwise it is a ...

specific Embodiment approach 2

[0211] Specific embodiment two: according to the description of specific embodiment one 4.2 calculation steps, this calculation step can also select the following alternate calculation methods:

[0212] British system;

[0213] metric system;

[0214] T: temperature at defect, ℉ / ℃;

[0215] RT NDT Reference no-ductility transition temperature, ℉ / ℃;

[0216] K IR : crack growth resistance, take K Ia and K IC the smaller value of

specific Embodiment approach 3

[0217] Specific implementation mode three: according to the description of specific implementation mode 1 5.2 calculation steps, this calculation step can also select the following alternate calculation methods::

[0218] This method is based on the strength factor resulting from mechanical loading, for the tensile stress intensity factor resulting from mechanical loading:

[0219]

[0220] For the bending stress intensity factor resulting from mechanical loading:

[0221]

[0222] m k : film stress correction factor; M B : Bending stress correction coefficient; a: Defect depth; m; Q: Defect shape correction coefficient in plastic zone;

[0223]

[0224]

[0225] σ m : primary film stress; Mpa

[0226] σ b : primary bending stress; Mpa

[0227] After considering the effect of thermal stress, the revised total stress intensity factor:

[0228]

[0229] σ M : secondary film stress; MPa

[0230] σ B : secondary bending stress; MPa

[0231] F: safety factor...

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Abstract

The invention relates to a fracture toughness analysis method for pressure-bearing main equipment and chemical machinery pressure-bearing equipment of a nuclear power plant, in particular to a fracture toughness analysis method for the pressure-bearing equipment, belongs to the field of nuclear power and chemical machinery pressure bearing, and aims to solve the problem that no clear judgment and calculation method exists in an existing pressure vessel fracture prevention method. According to the method, a linear elastic fracture mechanics theory is adopted, that is, the numerical value and distribution of a stress field near the crack tip of a linear elastomer with cracks are associated with the crack size which may cause non-ductile failure; and the numerical relationship among the fracture toughness, the crack defect size and the stress level of the material during crack propagation is referred to. According to the method, the load at each moment can be analyzed and judged, the calculation accuracy is improved, corresponding calculation software is developed, and the economy and the calculation efficiency are improved.

Description

technical field [0001] The invention relates to a fracture toughness analysis method for pressure-bearing main equipment of a nuclear power plant and chemical machinery pressure-bearing equipment, in particular to a method for analyzing the fracture toughness of pressure-bearing equipment, and belongs to the pressure-bearing fields of nuclear power and chemical machinery. Background technique [0002] There is no clear judgment and calculation method for the current pressure vessel fracture prevention method. In China, GB / T150 is generally used to prevent low-temperature brittle fracture from material selection and low-temperature low-stress conditions, and from the design, and there is no judgment from numerical simulation. Whether there is a possibility of fracture; foreign standards only provide inspection results and load values ​​during regular inspections to simply determine whether cracks have expanded to determine equipment failure, and do not consider and give recomm...

Claims

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Application Information

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IPC IPC(8): G01N3/12G06F30/23
CPCG01N3/12G06F30/23
Inventor 牟力波刘艳鹏邱砚明徐树林徐文吉范业娇
Owner HARBIN ELECTRIC POWER GENERATION EQUIP NAT ENG RES CENT CO LTD
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