DOI: 10.14489/td.2018.02.pp.048-058

Rykov A. N.
ULTRASONIC ACOUSTIC INSPECTION WITH IDENTIFICATION OF DEFECTS IN POLYMER COMPOSITE PRODUCTS
(pp. 48-58)

Abstract. Polymer composite products need a special approach and new solutions when developing and creating methods and means of their nondestructive testing. It is due to the great variety of kinds of these materials, the spread in physical-mechanical and strength characteristics and the large diversity of types of defects originating in the process of manufacturing and operating.When using a method of tuning by a standard specimen, the identification of inner defects and their classification are not possible because of the deficiency of informativity. The methods of identifying the defects by the depth of their location in complex polymer compo-site structures are limited by using of radiation monitoring methods what is not always real-ized in practice, furthermore, methods for evaluating the stability of their manufacturing techniques and the compensation of structural discontinuities are not sufficiently developed. The present paper considers a possibility of using the automatic ultrasonic inspection of cylindrical polymer composite products made by winding method, which makes it possible to detect the defects by means of nonstandard tuning of a threshold value of the signal, to identify defects by the depth of their location on the basis of the analysis of their shape and to evaluate the stability of techniques of manufacturing the products from results of the inspection. The results of experimental studies of different methods of treating the informative signal of polymer composite products to be inspected are presented.

Keywords: ultrasonic inspection, defect location depth, triangulation method, manufacturing technique stability, gradient indication.