Abstract
Abstract Micromechanical fracture‐toughness models are applied to experimental results for a metal‐matrix composite (2009/SiC/20p‐T6) to understand the temperature dependencies of toughness and fracture mechanisms, as well as to test quantitatively a continuum fracture‐mechanics approach. Models which couple the crack‐tip strain field, characteristic fracture‐process distance and measured intrinsic micro void‐fracture resistance predict the temperature dependencies of fracture‐initiation (KJICi) and crack‐growth (TR) toughnesses from 25°C to 316°C. The temperature dependencies of KJICi and TR result from the interplay between the fracture resistance and the crack‐tip strain field, each being temperature‐dependent. Strain‐based models are equally valid for void nucleation‐ or growth‐controlled fracture. A scenario for fracture is nucleation‐controlled damage within Sic‐particle clusters, corresponding to KJICi, followed by cluster‐damage growth to coalescence under increasing stress intensity. Void growth is stabilized increasingly at elevated temperatures.
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