Stress measurement primary stress separation method and device based on ultrasonic surface wave

An ultrasonic surface wave and stress measurement technology, which is applied in the direction of measuring devices, measuring forces, instruments, etc., can solve problems such as the inability to measure single-point stress

Inactive Publication Date: 2015-03-25
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method and device for stress measurement principal stress separation based on ultrasonic surface waves, to solve the problem that traditional surface stress measurement devices cannot measure single-point stress

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  • Stress measurement primary stress separation method and device based on ultrasonic surface wave
  • Stress measurement primary stress separation method and device based on ultrasonic surface wave
  • Stress measurement primary stress separation method and device based on ultrasonic surface wave

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Embodiment Construction

[0034] specific implementation

[0035] The stress measurement principal stress separation includes a separation method and a separation device;

[0036] The described separation method: firstly open the measuring device, apply oil on the surface of the object to be measured as a couplant, place the ultrasonic transducer group on the surface of the object to be measured and fix it, and use the three groups of ultrasonic transducers in the ultrasonic transducer group respectively. The energy detector samples, preprocesses, stores and analyzes the ultrasonic surface wave at the measuring point, calculates the propagation velocity change of the ultrasonic surface wave, thereby obtains the plane two-dimensional stress on the surface of the object, and measures the direction angle of the principal stress and the principal stress. The separation of the ultrasonic surface wave can be expressed as:

[0037] Δt=K 3 σ’ 33 +K 1 σ’ 11 (1)

[0038] where Δt is the propagation time...

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Abstract

The invention provides a stress measurement primary stress separation method and device based on an ultrasonic surface wave and belongs to methods and devices of measuring the surface stresses of materials. The separation device comprises an ultrasonic transducer, an ultrasonic pulse transmission receiver, a sampling processing system and an analysis system. The output end of the ultrasonic transducer is connected with the input end of the ultrasonic pulse transmission receiver. The output end of the ultrasonic pulse transmission receiver is connected with the input end of the sampling processing system. The output end of the sampling processing system is connected with the analysis system through a digital oscilloscope. The working stress and the residual stress on the surface of an object are measured through the surface wave. In addition, the principle stress separation method is provided. Replication experiments of two-dimension stress measurement achieve surface wave lossless detection of two-dimension plane stress, a demonstration objet is A3 steel, the engineering application value is high, the experiment precision is high, and the stress measurement principle stress separation method and device are suitable for engineering detection. Through the advantages of ultrasound, lossless detection can be conduced on the single-point multi-dimension stress at any position.

Description

technical field [0001] The invention relates to a method and a device for measuring the surface force of a material, in particular to a method and a device for measuring principal stress separation based on ultrasonic surface waves. Background technique [0002] In the long-term practice of people using various materials, a large number of material damage phenomena have been observed, and these phenomena have brought people many catastrophic accidents, which involve ships, aircraft, shafts, pressure vessels and nuclear equipment. Accidents, and therefore material failures, have always been an important aspect of the study of various materials. [0003] The reliability and life of the structural components of many key equipment have a great relationship with the residual stress and working stress on the components. Residual stress refers to the force that exists inside a metal material or mechanical component and maintains a balance without external factors such as load and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/25
Inventor 胡而已胡元邵营
Owner CHINA UNIV OF MINING & TECH
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