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INFLUENCE OF PARTICLE SIZE AND VOLUME FRACTION ON DAMAGE AND FRACTURE IN Al–Al 3 Ti COMPOSITES AND MICROMECHANICAL MODELLING USING THE GTN MODEL
Author(s) -
Chaobin He,
D. Steglich,
Heerens,
Hong Wang,
Brocks,
Dahms
Publication year - 1998
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 - 10.1046/j.1460-2695.1998.00113.x
Subject(s) - materials science , composite material , volume fraction , fracture toughness , void (composites) , fracture mechanics , powder metallurgy , particle (ecology) , ultimate tensile strength , particle size , toughness , fracture (geology) , microstructure , oceanography , chemistry , geology
Six different Al–Al 3 Ti composites were prepared via the powder metallurgy route. The size and volume fraction of Al 3 Ti particles was varied for a systematic investigation of fracture behaviour. The dominant failure mechanism in the composites is particle fracture and void growth starting from the broken particles. In comparison with the pure Al–matrix, an incorporation of Al 3 Ti particles reduces the crack initiation toughness and reduces the slope of the crack growth resistance curve. The inter‐particle distance was found to be the main microstructural parameter controlling the slope of the crack growth resistance curve. The modified Gurson–Tvergaard–Needleman model (GTN model) was applied to one of the composites. The behaviour of tensile specimens could be successfully modelled, whereas the experimentally observed crack propagation in precracked single edge bend specimens [SE(B)] could not be simulated with the GTN model.