Supersonic deformeter

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...

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

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