Method for calculating stress axial-radial crack stress intensity factor of outer wall of ultrahigh pressure vessel cylinder

A technology of stress intensity factor and container cylinder, which is applied in the direction of applying stable tension/pressure to test material strength, strength characteristics, instruments, etc. Consider comprehensively, the calculation method is fast, concise and accurate, and the calculation process is simple and fast.
CN113176142AActive Publication Date: 2021-07-27HEFEI GENERAL MACHINERY RES INST +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HEFEI GENERAL MACHINERY RES INST
Publication Date
2021-07-27

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Abstract

The invention relates to the technical field of ultrahigh pressure vessel design and development and fatigue failure evaluation calculation, in particular to a method for calculating an axial-radial crack stress intensity factor of the outer wall of an ultrahigh pressure vessel cylinder. The method comprises the following steps: determining structural parameters of an ultrahigh pressure vessel, measuring shape parameters of axial-radial cracks, and determining a load working condition of a cylinder; fitting stress distribution perpendicular to a plane where the crack is located; calculating a required fitting coefficient; calculating another fitting coefficient under the current crack shape; calculating crack shape coefficients at the deepest point of the current crack and the position close to the free surface; and calculating a stress intensity factor KI. According to the method, the accuracy of a calculation result can be ensured, meanwhile, rapid, concise and written calculation of the axial-radial semi-elliptical crack stress intensity factor of the outer wall of the cylinder can be achieved only through a formula, finite element calculation software and professional mathematical analysis software do not need to be relied on, and the method is more suitable for engineering application.
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Description

technical field

[0001] The invention relates to the technical field of ultra-high pressure vessel design and development and fatigue failure assessment calculation, in particular to a method for calculating stress intensity factors of axial-radial cracks on the outer wall of an ultra-high pressure vessel. Background technique

[0002] Axial-radial surface cracks on the outer wall of the cylinder are a common form of cracks in the manufacture and operation of ultra-high pressure vessels. type crack. From the perspective of damage tolerance of pressure vessels, it is necessary to accurately calculate the stress intensity factor of the crack tip, because it is a key parameter for the evaluation of the remaining strength of cracked pressure vessels and the prediction of remaining life based on fatigue crack growth. Therefore, in practical engineering applications, it is particularly important to find a fast and concise calculation method for the stress intensity factor of axial...

Claims

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