Institute of Physics of Materials AS CR, v. v. i. > Projects > Fracture toughness scatter in ceramics and brittle matrix composites at higher temperatures

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Fracture toughness scatter in ceramics and brittle matrix composites at higher temperatures

Anotace

Statistical aspects of fracture behaviour and fracture toughness evaluation of brittle matrix composites at higher temperatures will be followed. The aim is to analyse the scatter in fracture toughness values for selected monolithic ceramics and composite with long brittle fibres based on suitable statistical approach. Corresponding physical (microstructural, microfractographical) explanation of properties of the statistical distribution of fracture toughness data will be closely investigated. Bend specimens with chevron notch and the same having the straight notch will be employed for fracture toughness determination. The statistical characteristics thus enable to determine which test technique applied is more suitable for the assigned group of ceramics based materials. The effect of loading rate as well as specimen size effect on the applicability of chevron/straight notch technique will also be analysed due to their importance in connection with transferability of data.