Thermal and Volume Effects at Deformation of Thermoplastics and Their Glass Fiber-Reinforced Composites

Abstract Parallel measurements have been made of stresses, specific volume, and temperature of PC samples in the process of uniaxial tension. This information made it possible to establish the borders of different regions of a deformation curve. It has been established that the start of microplastic deformations corresponds to maximum value of volume increase and minimum value of temperature change. It has been shown that the tensile yield point corresponds to sharp increase of temperature and Δ V/V 0 = 0. Experimental methods of determining deformation limits of durability of glass fiber-reinforced thermoplasts have been developed.