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Steel member plane stress detection method based on ultrasonic transverse and longitudinal wave combination

A technology of plane stress and steel components, which is applied in the analysis of solids by using sound waves/ultrasonic waves/infrasonic waves, material analysis by using sound waves/ultrasonic waves/infrasonic waves, and measuring devices, etc. Information and other issues, to achieve the effect of simple test process, high sensitivity and high precision

Active Publication Date: 2021-05-07
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small change in wave velocity, the Acoustic-Time method has high requirements on the acquisition instrument, and at the same time, the feature quantity is relatively single, so it is difficult to extract more stress information

Method used

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  • Steel member plane stress detection method based on ultrasonic transverse and longitudinal wave combination
  • Steel member plane stress detection method based on ultrasonic transverse and longitudinal wave combination
  • Steel member plane stress detection method based on ultrasonic transverse and longitudinal wave combination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0180] The present invention selects the commonly used Q235b steel plate test piece, the thickness is 10mm, and its length and width are 250mm and 80mm respectively. Detection was carried out according to the detection steps mentioned in Example 1.

[0181] In the first step, a unidirectional step-by-step loading experiment is carried out on the steel plate specimen along the width direction, with a stress gradient of 5 MPa. In order to keep the steel plate in an elastic state, the upper limit of the loading stress is 165 MPa.

[0182] In the second step, within the stress holding time of each gradient, the ultrasonic shear wave and longitudinal wave are sequentially emitted at the calibration point, and the shear wave probe is incident on the ultrasonic shear wave pulse at 60° from the horizontal direction, and the first group of echo time domain signals are collected and stored ,Such as image 3 As shown; the shear wave probe is rotated 90°, incident again at an angle of 15...

Embodiment 2

[0195] The present invention selects a Q345b steel plate with a thickness of 10mm as the test object, and its length and width are 250mm and 80mm respectively. The calibration experiment and detection experiment were carried out according to the detection steps mentioned in Example 1. The results of the calibration experiment are shown in Table 4, and the values ​​of the obtained plane stress acoustic elastic coefficients are shown in Table 5. Also for the four detection points A1, A2, A3 and A4, the strain gauge method was used as a comparison, and the comparison results are shown in Table 6.

[0196] Table 4 Q345b steel plate calibration test results (f = 5MHz)

[0197]

[0198]

[0199] Table 5 Calibration value of plane stress acoustoelastic coefficient of Q345b steel plate (f=5MHz)

[0200]

[0201] Table 6 Test results of plane stress information of Q345b steel plate

[0202]

[0203]

[0204] It can be seen from the examples that the non-destructive det...

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Abstract

The invention relates to a steel member plane stress detection method based on ultrasonic transverse and longitudinal wave combination. The method comprises the following steps of: acquiring a to-be-detected in-service steel structure member copy test piece; performing a calibration experiment on the copy test piece, calibrating all stress-acoustic elasticity parameters of the copy test piece, and obtaining a plane stress information detection formula by taking the transverse wave acoustic time difference and the reciprocal of the square of longitudinal wave acoustic time under the center frequency of a probe as an independent variable and taking each stress component of plane stress as a dependent variable; determining a detection point, carrying out an ultrasonic experiment on the in-service steel member, and obtaining transverse wave and longitudinal wave echo time domain signals at the detection point; and performing spectrum analysis processing on the captured time domain signals to obtain the transverse wave acoustic time difference and the longitudinal wave acoustic time under the center frequency of the probe, and substituting the transverse wave acoustic time difference and the longitudinal wave acoustic time into a plane stress detection formula of the copy test piece to obtain plane stress information of the steel member. According to the method, the plane stress information of in-service steel plate components made of different materials and with different thicknesses can be directly detected, and a testing instrument is convenient to install, low in cost and easy to implement.

Description

technical field [0001] The invention belongs to the field of stress non-destructive testing of steel structural components, in particular to a method for detecting the plane stress of steel components based on the combination of ultrasonic transverse and longitudinal waves. Background technique [0002] Due to its welding requirements, the plate structure is one of the main structural forms of building steel components. As a commonly used steel structural member, steel plate members are widely used in many fields of civil engineering. In actual engineering, most steel plate members are in a state of plane stress, and the identification of the internal plane stress is the key to obtaining the true stress state of steel plate members and an indicator to judge whether the steel structure can serve normally. In order to accurately understand and grasp the plane stress state and service performance inside steel plate members, it is necessary to develop a direct, sensitive and ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07
CPCG01N29/075
Inventor 李祚华王英瞩朱旭鹏隆志力滕军
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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