Disclosing residual thermal stresses in UHT fibre-reinforced ceramic composites and their effect on mechanical behaviour and damage evolution

The reusability of CMCs with inherently high-temperature capabilities and ablation resistance goes through understanding the effects residual thermal stresses (RTS) caused by expansion mismatch between fibre matrix. In this work, RTS ultra-high temperature ZrB2–SiC based ceramic reinforced carbon fibres was dependent on anisotropy coating. A detailed microstructural analysis about state matrix (i.e. porosity cracks) within bundles, volumetric content their degree dispersion) performed. different level RTS, among composites, studied comparing stiffness-displacement curves bending test cyclic dilatometric curves. correlation thermomechanical behaviour also evaluated flexural tests at 1500 °C after shock. results showed that not only reduced strength, but influenced damage evolution stiffness linearity. As a result, release can alter pristine geometry, obtained sintering or machining, due to formation inner freed (IFFs) Young's modulus stress strain failure onset investigated CMCs.