Welded member fatigue stress and strain real-time non-contact type monitoring method

A welding component, non-contact technology, applied in the field of experimental mechanics, can solve problems such as fatigue, inconvenient contact sensors, stress and strain monitoring distribution rules, etc., and achieve the effect of high precision, powerful post-processing program, and simple operation

Inactive Publication Date: 2015-10-07
SOUTHEAST UNIV
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Problems solved by technology

[0004] In order to solve the problems in the prior art that the contact sensor monitors the distribution law of stress and strain and the evolution law of fatigue stress and strain on the parts where the contact sensor is not convenient for the welding component to be installed, the present invention proposes a real-time non-contact method for fatigue stress and strain of the welded component monitoring method

Method used

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  • Welded member fatigue stress and strain real-time non-contact type monitoring method
  • Welded member fatigue stress and strain real-time non-contact type monitoring method
  • Welded member fatigue stress and strain real-time non-contact type monitoring method

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032]This embodiment is an experiment of monitoring the stress and strain in the weld area when the fatigue testing machine performs fatigue loading on the welded components.

[0033] Such as figure 1 and figure 2 As shown, the steel used in this test is Q345B steel commonly used in construction, and its yield strength is 345Mpa. The standard test welded member 1 is made according to the requirements of relevant specifications. The welded component 1 includes the monitoring area 2. Since the stress at the weld plays a major role in controlling the welded component 1, the weld and its edge range are taken as the monitoring area 2. The monitoring area 2 includes the weld 3 and the edge of the weld, with a length of 75mm The width is 40mm, and a grid is drawn on the monitoring area 2. In order to facilitate the visual system of the monitoring device t...

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Abstract

The present invention discloses a welded member fatigue stress and strain real-time non-contact type monitoring method. According to the method, the welded member welding seam and a certain surrounding area are subjected to grid division with a certain interval, each grid intersection point is adopted as an infinitesimal body as the stress and strain analysis unit, the feature information of the pixel points of all infinitesimal bodies in the area to be measured during the fatigue load acting process are extracted through a machine vision monitoring system when the fatigue load acts on the member, the collected member image is subjected to pixel point matching, the relation between the stress and strain change law and the image feature is established so as to obtain the feature change of the infinitesimal body during the fatigue load acting process, and finally the strain value and stress distribution law and the stress strain evolution law during the fatigue process are obtained. The method of the present invention is used for solving the monitoring problem of the stress and strain status distribution and evolution law of the welded member in the steel structure under the fatigue load acting.

Description

technical field [0001] The invention belongs to experimental mechanics, in particular to a real-time non-contact monitoring method for fatigue stress and strain of welded components. Background technique [0002] Welded connection has been widely used as the main connection method of building steel structure and wind power structure tower. security. The fatigue strength of the weld is much lower than the fatigue strength of the base metal. The main form of weld failure is fatigue. The fatigue resistance of the weld depends to a large extent on the macroscopic and microscopic geometry of the weld, which affects the fatigue strength of the weld. There are many factors, such as stress amplitude, average stress, welding residual stress, etc., so the monitoring of weld fatigue stress is very important. If the change of weld fatigue stress state cannot be detected in time, it will affect the normal operation of the structure, and in severe cases, it will cause huge damage to per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32
Inventor 李万润李爱群赵丽洁方钊杜永峰王雪平刘鹏
Owner SOUTHEAST UNIV
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