Authors: O. Kriukov | H. Silin
Source: Випробування та сертифікація (article, 2025-12-30)
Field: Materials Science — Materials Chemistry

JUSTIFICATION AND RESEARCH OF A SET OF INDICATORS FOR IDENTIFYING TYPES OF DEFECTS IN FIREARM GUNBARREL CHANNELS The article presents a description of the initial stages of processing data on the geometric characteristics of the firearm barrel bores (BB), obtained during its technical diagnosis using a laser triangulation measuring instrument. The considered method of technical diagnosis of the BB involves obtaining an array of point coordinates that reproduce the unfolded surface of the bore, localizing defects on the obtained unfolding, and determining the main geometric characteristics of the identified defects. It is noted that at the current stage of development of this diagnosis method, an unresolved issue remains the formation and theoretical substantiation of a set of indicators that would enable the identification of barrel bore defects by their predefined types. The purpose of this article is aimed at resolving the contradiction between the practical need for such a set of indicators and the current state of development of the scientific and methodological framework in this field of knowledge. In substantiating the composition of the set of indicators for identifying the type of barrel bore defect, the expediency of using a primary and additional indicators was noted. As the primary indicator σ, the root-mean-square value of the deviation of the geometric characteristics of the actual defect surface from the corresponding characteristics of the model surface of a specific defect type is applied. This characteristic makes it possible to quantitatively assess the mentioned deviation and is distinguished by such advantages as insensitivity to the deviation sign and consideration of the integral deviation across the entire sample of surface points. The formation of the group of additional indicators was preceded by an analysis of the shape characteristics of typical barrel bore defects. It was determined that the shapes of typical defects are characterized by specific relationships between their linear and spatial parameters. Such interrelations indicate the presence of regularities in defect formation processes and make it possible to create models of typical barrel bore defects. According to the established dependencies, the set was supplemented with indicators reflecting the ratios between such geometric characteristics of barrel bore defects as: width and length of the base, maximum defect depth and base width, as well as base length and area. An additional indicator was also introduced, which reflects the proportion of the total length of defect base contour elements parallel to the direction of rifling on the barrel bore unfolding, relative to the total length of this contour. The proposed set of indicators can be integrated into the general algorithm of the method for technical diagnosis of the barrel bore using a laser triangulation instrument for measuring its geometric characteristics. This increases the objectivity of defect identification and creates prerequisites for its practical implementation in systems for monitoring the technical condition of firearm barrel bores. Set (abstract data type) ; Triangulation ; Identification (biology) ; Surface (topology) ; Sample (material) ; Field (mathematics) ; Point (geometry) ; Indicator value ; Sign (mathematics) Material Properties and Failure Mechanisms ; Military Technology and Strategies ; Electromagnetic Launch and Propulsion Technology