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Crack resolution detection method

A detection method and resolution technology, applied in the detection field, can solve problems such as poor repeatability, inconvenient testing, and scattered data, and achieve the effects of convenient testing, good reproducibility, and high precision

Active Publication Date: 2018-08-31
BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the traditional method of determining the resolution of the on-off crack monitoring method, the resolution is generally obtained by observing the on-site crack growth. This method is inconvenient to test. In addition, due to the complexity of the on-site conditions, the data is scattered. So the repeatability is poor

Method used

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Embodiment Construction

[0022] Exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Like reference numerals refer to like parts throughout the specification.

[0023] figure 1 is a diagram of a target sample 1 to be tested prepared by a crack resolution detection method according to an exemplary embodiment of the present invention.

[0024] Such as figure 1 As shown, the shape of the tested target sample 1 prepared according to the crack resolution detection method of an exemplary embodiment of the present invention can be determined according to the shape of the measured target and the loading situation, for example, when the measured target When it is a pitch bearing, since the pitch bearing mainly bears circumferential force and produces cracks, it is only necessary to consider the stress per unit area of ​​the cross section of the pitch bearing, that is to say, the thickness, width and The curvature has little effect on t...

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Abstract

The invention provides a crack resolution detection method. The method comprises the following steps: preparing a detected target sample comprising precracks; fixing a sensing layer on the detected target sample along a direction crossing with an extension direction of the precracks, and enabling the sensing layer to be separated from the precracks by a preset distance; mounting the detected target sample on testing equipment; connecting two ends of the sensing layer to a sensing layer on-off detector; loading the detected target samples along the direction crossing with the extension direction of the precracks; decreasing a loading speed to zero when the sensing layer on-off detector monitors abrupt change of resistance; determining a resolution ratio of the sensing layer; and detaching the detected target sample from the testing equipment.

Description

technical field [0001] The invention relates to the detection field, in particular to a crack resolution detection method. Background technique [0002] The invention patent application with the publication number CN 106442637A relates to a flange crack monitoring device and method. In this method, the crack detection sheet is installed on the surface to be tested, and the crack is monitored by monitoring the on-off of the resistance (that is, the on-off crack monitoring method ), when it is detected that the resistance of the crack detection sheet is very small, it is considered that the detected surface is complete without cracks, and when the resistance of the crack detection sheet is detected to be very large, for example, the threshold is set to 10 6 ohms, it is considered that a crack has occurred on the surface to be tested. However, this patent application does not mention how to determine the resolution of cracks, that is, the minimum crack width that can be detect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04
CPCG01N27/041
Inventor 蔡健平刘若愚
Owner BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD
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