SU892289A1 - Method of introducing ultrasonic oscillations at determination of article stressed state - Google Patents

Description

(5) METHOD FOR INPUT OF ULTRASONIC Oscillation. WHEN DETERMINING STRESSED STATE

I

The invention relates to ne. destroying control and can be used to determine the stress state of materials and products.

A known method of entering ultrasound. oscillations in determining the stress state of the product, which means that the transducer is placed at the end of the tested product and strengthened with.},

The disadvantage of this method is that the use of transducers of shear oscillations (their seam adhesive) significantly reduces the performance of monitoring, and the use of transducers of only longitudinal vibrations does not allow to obtain the desired accuracy of determining the stress state of the product.

The purpose of the invention is to improve the accuracy and performance of the control.

This goal is achieved by the fact that in the end part of the product a recess of a conical shape is performed;

the clone of which forms a cone which is not less than the first critical angle, fills this recess with contacting liquid and places the transducer of longitudinal oscillations on the generator plane of the contact liquid.

The drawing shows the implementation of this method.

The method is carried out as follows.

ten

In the end part of the product 1, a conical recess is made, the angle of inclination of the generatrix of the cone of which is not less than the first critical angle, is filled with its contact liquid

Claims (1)

15 2 and place the transducer 3 longitudinal waves on the surface k of the contact fluid. When ultrasonic vibrations are excited in the contact fluid, the number of shear vibrations is excited with the direction of the polarization vectors fan. Due to the fact that the product is limited in size, oscillations propagate along the rod, are reflected from against the positive end, and are recorded, by analogy with oblique reception. At the same time, the speed of propagation of the shear component depends on the stress state and, due to the fan-shaped distribution of the polarization vector, does not depend on the redistribution of stresses along the transverse, part of the article under investigation. The invention The method for introducing ultrasonic oscillations in determining the stress state of a product whose dimensions coincide with the size of the ultrasound transducer, which means that the transducer is placed at the end of the controlled product, characterized in that, in order to improve the accuracy and the measurement performance, in the end part of the product, a cone-shaped groove is performed, the angle of inclination of the cone-forming agent of which is not less than the first critical angle; oh liquid and place the transducer of longitudinal oscillations on the resulting plane of contact liquid. Sources of information taken into account during the examination 1. V. Bobrenko. Research and development of ultrasound methods and equipment for the determination of stresses, Abstract., OPI, Chisinau, 1975.