Supersonic deformeter

A strain gauge and ultrasonic technology, applied in the field of ultrasonic strain gauges, can solve the problems of difficulty in judging the change of sound velocity, short life of resistance strain gauges, and limited ray penetration depth, etc., and achieve easy installation, no electromagnetic interference, and low cost Effect

Inactive Publication Date: 2004-09-15
WUHAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

The shortcomings of the electrical measurement method are: the resistance strain gauge has a short life, poor anti-interference ability, and can only measure the relative amount, that is, the strain increment, which is not suitable for long-term monitoring.
However, it has a fatal weakness that calibration is very difficult, because stress is not as sensitive to sound velocity changes as defects
For actual engineering, it is difficult to judge whether the change of sound velocity is caused by stress or by defects
[0013] All kinds of ray methods are generally only used for surface stress measurement, because the penetration depth of rays is limited

Method used

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  • Supersonic deformeter
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Embodiment Construction

[0025] The present invention mainly consists of emitting piezoelectric sheet (piezoelectric crystal or piezoelectric ceramic), sound transmission medium (wire or air grid), receiving piezoelectric sheet (piezoelectric crystal or piezoelectric ceramic), sound insulation material (such as Foam, etc., when the sound transmission medium is made of metal wire, vacuum can also be used for sound insulation), metal casing (can be made of stainless steel or other alloy steel), power lead wires at the transmitting end, power lead wires at the receiving end, etc.

[0026] The two sides of the emitting piezoelectric sheet and the receiving piezoelectric sheet are plated with silver film as electrodes, and a lead wire is respectively connected to the electrode surface to connect with the external core wire as a power supply circuit. The transmitting piezoelectric sheet, the receiving piezoelectric sheet and the metal casing are fixed by sound-insulating materials such as foam. The sound-tr...

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Abstract

The invention is a kind of ultrasonic deformeter, which is mainly made up of emission piezo-electric, sound insulating material, metal shell, transmitting end power outgoing line, receiving end power outgoing line. It has merits of high accuracy, low cost, no electromagnetism interference, no loose, adjustable strain absolute magnitude, small size. It especially is suitable for long time strain measurement and the rheopectic measurement of construction structure safe monitoring, hill arpon.

Description

technical field [0001] The invention relates to an instrument for stress and strain measurement of materials and structures. Background technique [0002] Large-scale engineering structures and infrastructure, such as bridges, super high-rise buildings, large-span space structures, large dams, nuclear power plants, offshore oil production platforms, and pipeline systems for oil, water, and gas supply, all have a service life of several decades , even hundreds of years. During its service, due to adverse factors such as environmental load, fatigue effect, corrosion peeling and material aging, the structure will inevitably produce damage accumulation, which will reduce the resistance and even lead to sudden accidents. If the damage of the structure cannot be timely and correctly evaluated, it is impossible to understand the health of the structure and make correct decisions; once an accident occurs, it will bring huge losses. In recent years, people pay...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/02
Inventor 杨吉新
Owner WUHAN UNIV OF TECH
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