MODEL OF INTERNAL STRESS IN BLANKS OF CARBON-CARBON COMPOSITE MATERIALS BASED ON NEEDLE-PUNCHED FRAMEWORKS MANUFACTURED BY THE FABRIC WINDING METHOD

This paper presents the results of constructing a model of internal residual stresses arising during the manufacture of blanks of carbon-carbon composite materials based on needle-punched axisymmetric reinforcing frames, obtained by the method of winding fabric with simultaneous needle-punching, compacted with a pyrolytic carbon matrix using a thermogradient method. Calculations were carried out for changes in the stress-strain state of a material workpiece that arise during its manufacture during heating and cooling. The main dependencies of the stress level on the technological parameters of blank manufacturing are obtained, the magnitude and danger from the point of view of occurrence of defects of various stresses are estimated. The main dependencies of the stress level on the technological parameters of blank manufacturing are obtained, the magnitude and danger from the point of view of occurrence of defects of various stresses are estimated. The result of the calculations shows that radial stresses are directly proportional to the temperature difference during cooling of the blank. It is shown that the greater the thickness of the material blank, the higher the radial stresses in it. The results obtained can be useful in optimizing the parameters of the manufacturing technology of this class of materials.