期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 154, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2021.104517
关键词
Metamaterials; Quasi-brittleness; Ductility; Microcracking; Damage; Fracture; High gradients; Phase-field
资金
- [ANR-19-CE08-0010-01]
- [ANR-20-CE91-0010]
- [ANR-10-IDEX-0001-02 PSL]
This paper examines how artificially engineered metamaterials can be designed to de-localize cracking in brittle materials, ensuring that each breakable sub-element fails independently, and reveals the structural underpinning behind the difference between brittle and quasi-brittle behavior.
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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