Instytut Podstawowych Problemów Techniki

UMO-2016/21/B/ST8/02437

2017-01-13 / 2021-10-12

Jedyny wykonawca

NCN

OPUS

11

The development of materials engineering has led to the creation of new materials with improved functional properties. One of the new types of materials introduced into industrial practice are plastics and polymers. These materials exhibit the viscoelastic rheological properties, i.e., they have simultaneously properties of liquids and solids. Due to their properties such as low specific weight, high resistance to chemical agents, ease of processing, these materials are widely used in many products manufactured by the industry: e.g., chemical, automotive, aviation and space industry. In addition, these materials are widely used in everyday life. It is very important both from a cognitive and practical point of view, to develop new and accurate methods of measuring the rheological parameters (viscosity η, elasticity μ and density ρ) of plastic and polymers. New materials require new methods of measuring their rheological parameters. For the measurement of rheological parameters of viscoelastic media so far mechanical methods are used. These methods are very cumbersome, outdated, time consuming and destructive. Mechanical methods are laboratory methods that relies on extraction of samples of an investigated material. Measuring setup contains moving parts. Therefore these methods cannot be used in the industry for continuous (on-line) monitoring of technological processes. The author of the project proposes to apply for measurement of rheological parameters a new ultrasonic method that uses surface Love waves. This method is free of the disadvantages of previously used mechanical methods for measuring the rheological properties of materials. The main advantages of the Love wave method compared to traditional mechanical methods of material testing are: 1) it is non-destructive, 2) it is fast and accurate, 3) it can be computerized and 4) there are no moving parts.