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The fracture toughness of composite laminates with a negative Poisson's ratio
Author(s) -
Donoghue J. P.,
Alderson K. L.,
Evans K. E.
Publication year - 2009
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200982031
Subject(s) - auxetics , poisson's ratio , poisson distribution , materials science , composite material , fracture toughness , moduli , composite number , plane (geometry) , mathematics , geometry , physics , statistics , quantum mechanics
Two sets of carbon fibre laminate configurations have been designed, manufactured and examined. The first consisted of one in‐plane auxetic ( i.e. having a negative Poisson's ratio) and one with matched elastic moduli, but a positive in‐plane Poisson's ratio. The second consisted of three laminates, again with matched elastic moduli, but with negative, near zero and positive thru‐thickness Poisson's ratio. Fracture toughness is predicted to be enhanced if a negative thru‐thickness Poisson's ratio is present. This study also shows that more energy is required to propagate a crack in the auxetic laminate and that it is less notch sensitive than its conventional counterpart for the negative in‐plane Poisson's ratio.