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ELEVATED TEMPERATURE FRACTURE OF PARTICULATE‐REINFORCED ALUMINUM PART II: MICROMECHANICAL MODELLING
Author(s) -
Somerday B. P.,
Leng Y.,
Gangloff R. P.
Publication year - 1995
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1995.tb00925.x
Subject(s) - particulates , materials science , fracture (geology) , composite material , aluminium , micromechanics , metallurgy , composite number , chemistry , organic chemistry
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 ( K JICi ) and crack‐growth ( T R ) toughnesses from 25°C to 316°C. The temperature dependencies of K JICi and T R 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 K JICi , followed by cluster‐damage growth to coalescence under increasing stress intensity. Void growth is stabilized increasingly at elevated temperatures.