| Abstract: | Based on the theory of solid matter deformation and taking into consideration the specificity of propagation of ultrasonic waves in polymers, the acoustic nondestructive method has been chosen for controlling radiation-cured thermosetting polymer materials, which allows us to obtain certain information about the structure and useful characteristics of these materials. The correlation relationships of propagation velocities for flexural ultrasonic waves initiated in the material at a frequency of 60 kHz by piezotransducers-concentrators with exponential waveguides and point contact have been established. This permits us to determine the dose of ionizing radiation absorbed by the material, the degree of molecular orientation or degree of stretching, the content of fillers in the material, as well as to evaluate the thermosetting forces determined by thermorelaxation stresses under isometric conditions.Chemistry Department, University of Latvia, LV-1001. Institute of Polymer Materials, Riga Technical University, Riga, Latvia, LV-1048. Published in Mekhanika Kompozitnykh Materialov, Vol. 33, No. 3, pp. 394–407, May–June, 1997. |
