Acoustic control of materials with developed mesostructure
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RESEARCH AND TESTING METHODS
ACOUSTIC CONTROL OF MATERIALS WITH DEVELOPED MESOSTRUCTURE Yu. H. Bezymyannyi
UDC 621.762:621.763:620.1:53.082.4
On the basis of generalization of the results of a series of theoretical and experimental investigations, we have formulated the scientific foundations of the synthesis of qualitatively new acoustic methods for predicting the properties and controlling the structure and defectiveness of multicomponent materials. On the example of powder and fibrous materials and their compositions, ceramics, foam-metals, honeycomb structures, diamond composites, multilayer constructions, and products made of them, we have shown that acoustic methods can serve as a reliable tool for obtaining information on the effective properties of the material as a whole and the parameters of ensembles or separate elements of its mesolevel.
The manufacture of composites by the methods of powder metallurgy represents one of the promising directions in the development of new materials of specialized destination [1]. The desirable properties of such materials are usually obtained via the formation of a developed mesostructure [2]. This process is connected with the introduction of substantiated technologies of the manufacture of materials with inalienable elements of the prediction of their properties and diagnostics of state [3, 4]. To solve these problems in the case of a complex structure of the composite, the traditional methods of nondestructive testing are insufficiently efficient and, hence, require certain modifications [5]. The nondestructive methods of testing and prediction are based on the relations between the parameters of physical fields and the properties of materials [6]. The parameters of acoustic fields are directly connected with the elasticity of a solid and indirectly with the specific features of its structure [7 – 10]. These connections have led to widespread acoustic methods for studying the properties and diagnosing the state of materials [11]. The possibilities of using measurements of the velocity of elastic wave propagation by the resonance ultrasonic method in powder metallurgy were analyzed earlier [5]. In recent years, several works (e.g., [12 – 18]) have been published, where good prospects of different acoustic methods for the solution of some problems of the control of materials with complex structure were corroborated. In addition, significant achievements have been obtained recently in the theory of elastic vibrations and waves for materials with microstructure [19] and in the theory of ultrasonic flaw detection [20]. In the past years, a series of investigations in this field was carried out at the Frantsevych Institute for Problems of Materials Science. Among them, one should mention: — theoretical and experimental studies of the laws of the formation of acoustic fields in materials with multilevel hierarchical structure; Frantsevych Institute for Problems in Materials Science, Ukrainian Academy of Sciences, Kyiv. Translated from Fizyko-Khimichna Mekhanika Materialiv
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