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Fatigue life safety predicting method for pressure container

A technology for fatigue life and safety prediction, applied to pressure vessels, instruments, fixed-capacity gas storage tanks, etc., can solve problems such as inapplicability, and achieve the effects of good actual agreement, clear physical meaning, and high calculation accuracy

Inactive Publication Date: 2007-08-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ΔK is only limited to the fracture problem of linear elasticity and small-scale yielding, and it is not applicable to a large number of large-scale yielding and overall yielding fracture problems in engineering practice. The theoretically more perfect cyclic J integral ΔJ should be used as the fracture parameter

Method used

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  • Fatigue life safety predicting method for pressure container
  • Fatigue life safety predicting method for pressure container
  • Fatigue life safety predicting method for pressure container

Examples

Experimental program
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Effect test

Embodiment Construction

[0024] Firstly, according to the structure, material and force condition of the pressure vessel, the tolerance size of the pressure is obtained, and the tolerance size is stored in the computer database for later use.

[0025] Qualitatively and quantitatively obtain the defect type, position and size of the pressure vessel through non-destructive testing methods (such as ray or ultrasonic testing), and input such initial defect information into the computer; also input the three-dimensional address information about the nodes into the computer.

[0026] From the Paris-Erdogan extension model, it can be expressed by the following formula for the stable crack growth stage:

[0027] da dN = c ( ΔK ) n - - - ( 1 )

[0028] For the crack fatigue growth rate of a...

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Abstract

A method for predicting the endurance life of pressure container includes such steps as inputting initial defect information and the 3D address information of node, calculating the area increment and expansion increment of crack, adding said expansion increment to original crack depth to obtain current crack depth, comparing it with the threshold stored in computer, and controlling the pressure container.

Description

technical field [0001] The invention relates to a safety testing method for a pressure vessel, in particular to a safety prediction method for the fatigue life of a pressure vessel. Background technique [0002] The pressure vessel is the key equipment in the construction of the national economy, and it is also a special pressure-bearing equipment with explosion hazards. It bears the pressure of high temperature, low temperature, flammable, explosive, highly toxic or corrosive media. Once damaged and Leakage will lead to irreversible catastrophic accidents. In the pressure vessel damage accidents, a large part is caused by the crack fatigue expansion, so if the crack expansion can be known in advance, corresponding measures can be taken for the pressure vessel to avoid accidents such as explosions. The fatigue life prediction of pressure vessels has always been a key topic in the field of fracture mechanics at home and abroad. At present, the commonly used method is the ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17C1/00G06F17/00
Inventor 金志江
Owner ZHEJIANG UNIV
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