A temperature-damage-dependent fracture strength model for ultra-high temperature ceramics

A temperature-damage-dependent fracture strength model (TDDFS) for ultra-high temperature ceramics is proposed based on the Griffith energy method and a definition of maximum storage energy, which studied the effects of temperature, crack size and damage accumulation on fracture strength. Based on TDDFS model, the typical fracture strength and its temperature dependency of TiC are investigated. The results indicate that the sensitivity of fracture strength to crack size declines rapidly as temperature rises, while its sensitivity to Young's modulus increases rapidly as temperature rises. These conclusions can be used as a guide in material design. The use of this model will help us to discover those potential materials with the exceptional high-temperature properties that are needed for extreme engineering applications.