Investigation of residual stresses on the boundary of SiC/SiC + 20% TiB2 composite materials joining by optic modulation–polarization method

The optical method of registration of internal stresses in composite materials is offered. The method is based on the modulation of polarization of laser radiation reflected from anisotropic media and the definition of its anisotropy parameters by means of this modulation. Residual stresses on the border of SiC/SiC + 20% TiB2 joining, caused by the difference of temperature expansion coefficients, were studied by the offered method. The experimental curve of stress distribution is in a good qualitative agreement with theoretical calculation. The stress magnitude obtained by the given method well coincides with the values obtained by a Raman scattering method and diffraction of X-ray radiation.