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De-localizing brittle fracture

Authors
  • Salman, Oguz Umut
  • Truskinovsky, L
Publication Date
Nov 07, 2020
Source
HAL-INRIA
Keywords
Language
English
License
Unknown
External links

Abstract

Localization of damage in conventional brittle materials is the source of a host of undesirable effects. In this paper, we show how artificially engineered metamaterials with all brittle constituents can be designed to ensure that every breakable sub-element fails independently. The crucial role in the proposed design is played by high contrast composite sub-structures with zero-stiffness, furnishing nonlocal stress redistribution. The de-localized cracking of the resulting nominally brittle systems can be linked to the fact that their continuum description is dominated by gradient rather than classical elasticity. By engineering a crossover from brittle to effectively ductile (quasi-brittle) behavior, we elucidate the structural aspects distinguishing macro-cracking-dominated fracture from micro-cracking-dominated damage.

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