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Incubation period prediction method for central crack stretching test piece with thickness and crack depth influences considered

A technology of central crack and tensile specimen, applied in the direction of measuring device, strength characteristics, using applied stable tension/compression to test material strength, etc., to achieve the effect of simplifying the prediction steps

Active Publication Date: 2019-07-02
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the application of this prediction model involves a large number of complex calculation processes and has a certain degree of conservatism, and there are certain limitations for the application of actual components.

Method used

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  • Incubation period prediction method for central crack stretching test piece with thickness and crack depth influences considered
  • Incubation period prediction method for central crack stretching test piece with thickness and crack depth influences considered
  • Incubation period prediction method for central crack stretching test piece with thickness and crack depth influences considered

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Embodiment Construction

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In this embodiment, P92 high-temperature heat-resistant steel is selected.

[0020] The incubation period prediction method of the central crack tensile specimen considering thickness and crack depth influence of the present invention comprises the following steps:

[0021] S1: Establish a creep incubation period prediction model for a central crack tensile specimen, the model includes a central crack tensile specimen body 1 with a cuboid structure, and upper and lower holes 2 and lower holes are symmetrically arranged at the upper and lower ends of the specimen body. hole 3; a prefabricated crack 4 is inserted in the middle of the symmetrical plane of the sample body, and a constant p...

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Abstract

The invention discloses an incubation period prediction method for a central crack stretching test piece with thickness and depth influences considered. A central crack stretching test piece model isused, the incubation period is calculated and extracted, a large amount of analog data is used, a formula is fit, and an incubation period prediction method for the central crack stretching test pieceis put forward. The method has the beneficial effects of simplifying the central crack stretching test piece incubation period prediction step.

Description

technical field [0001] The present invention relates to the evaluation of the incubation period prediction engineering criticality of the central crack tensile specimen (MT) considering the influence of thickness and crack depth. Incubation period of tensile specimens. Background technique [0002] Components and equipment serving in high-temperature environments will inevitably have various defects during production and service. The initiation and propagation of creep cracks is a major failure mechanism of high-temperature components containing defects and leads to failure before the design life. The incubation period of creep cracks occupies a large proportion in the service life of high-temperature components. In order to ensure the reliability of components serving in high-temperature environments, the research on the incubation period of creep cracks becomes more and more important. Creep initiation is defined as the time when microcracks (or pores) first connect to f...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0066
Inventor 徐连勇邬栋权荆洪阳韩永典赵雷吕小青
Owner TIANJIN UNIV