Thermal shock strength of carbon-carbon composite by laser irradiation technique based on shear strength criterion

The laminated carbon-carbon (C/C) composite is candidate material for plasm a-facing components in fusion reactors. Its thermal shock strength must be evaluated for an application to the components facing the high-temperature plasma field. However, few studies have been done. A laser irradiation meth od newly proposed was applied effectively to lamination of C/C composite fo r the evaluation of thermal shock strength by subjecting a heat flux up to 27 J/mm(2) on the specimen surface. By introducing the critical power densi ty at which the material fracture occurs, thermal shock strength was obtain ed. It was concluded that the critical power density could be a new measure to evaluate thermal shock strength for laminated C/C composite.