De-localizing brittle fracture
OU Salman, L Truskinovsky - Journal of the Mechanics and Physics of …, 2021 - Elsevier
Journal of the Mechanics and Physics of Solids, 2021•Elsevier
Extreme localization of damage in conventional brittle materials is the source of a host of
undesirable effects. We show how artificially engineered metamaterials with brittle
constituents can be designed to ensure that every breakable sub-element fails
independently. The main role in the proposed design is played by high contrast composite
sub-structure with zero-stiffness, furnishing nonlocal stress redistribution. The ability to de-
localize cracking in such nominally brittle systems can be linked to the fact that their …
undesirable effects. We show how artificially engineered metamaterials with brittle
constituents can be designed to ensure that every breakable sub-element fails
independently. The main role in the proposed design is played by high contrast composite
sub-structure with zero-stiffness, furnishing nonlocal stress redistribution. The ability to de-
localize cracking in such nominally brittle systems can be linked to the fact that their …
Abstract
Extreme localization of damage in conventional brittle materials is the source of a host of undesirable effects. We show how artificially engineered metamaterials with brittle constituents can be designed to ensure that every breakable sub-element fails independently. The main role in the proposed design is played by high contrast composite sub-structure with zero-stiffness, furnishing nonlocal stress redistribution. The ability to de-localize cracking in such nominally brittle systems can be linked to the fact that their continuum description is dominated by the gradient (bending) rather than classical (stretching) elasticity. By engineering a crossover from brittle to effectively ductile (quasi-brittle) behavior, we reveal the structural underpinning behind the difference of fracture and damage.
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