Analysis of Interfacial Coating Effect on Thermal Stress in Composites

A preliminary model for the analysis of thermo-mechanical behaviour of interfacial coatings on thefibers in unidirectional composites have been developed on the solution of thermo-elastic mechan-ics. Thermal stress would be introduced into the composite during cooling because of the mismatchof thermo-mechanical properties among their components. The low modulus coating can effectivelyreduce the interracial stress caused by different thermal expansion coefficient between fibers and ma-trix, no matter how high or low the expansion coefficients of coatings are in CF/Al and SiC/Ticomposite systems, however, high modulus coating can decrease the interfacial compressive stress,only when the thermal expansion coefficient of coating is lower.

Analysis of Interfacial Coating Effect on Thermal Stress in Composites

A preliminary model for the analysis of thermo-mechanical behaviour of interfacial coatings on the fibers in unidirectional composites have been developed on the solution of thermo-elastic mechan- ics. Thermal stress would be introduced into the composite during cooling because of the mismatch of thermo-mechanical properties among their components. The low modulus coating can effectively reduce the interracial stress caused by different thermal expansion coefficient between fibers and ma- trix, no matter how high or low the expansion coefficients of coatings are in CF/Al and SiC/Ti composite systems, however, high modulus coating can decrease the interfacial compressive stress, only when the thermal expansion coefficient of coating is lower.