Abstract
Neutron diffraction was used to measure thermal residual strains in SiC-fiberreinforced reaction-bonded silicon nitride composites as a function of volume fraction of fibers. The measured values are in agreement with those estimated by finite-element modeling. Due to the anisotropy of the thermal expansion coefficient of SiC, residual axial strain (stress) is tensile and residual transverse strain (stress) is compressive in the fibers. The variation in the measured residual axial strain in the matrix can be related to the density of the composite. In addition, neutron diffraction was used to study the effects of fiber coatings and processing on the thermal residual strains.
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