Journal Articles Acta Materialia Year : 2016

Fracture toughness anomalies: Viewpoint of topological constraint theory

Bu Wang
  • Function : Author
Mengyi Wang
  • Function : Author
Yingtian Yu
  • Function : Author
Morten M. Smedskjaer
  • Function : Author
Franz-Josef Ulm

Abstract

The relationship between composition, structure, and resistance to fracture remains poorly understood. Here, based on molecular dynamics simulations, we report that sodium silicate glasses and calcium silicate hydrates feature an anomalous maximum in fracture toughness. In the framework of topological constraint theory, this anomaly is correlated to a flexible-to-rigid transition, driven by pressure or composition for sodium silicate and calcium silicate hydrates, respectively. This topological transition, observed for an isostatic network, is also shown to correspond to a ductile-to-brittle transition. At this state, the network is rigid but free of eigen-stress and features stress relaxation through crack blunting, resulting in optimal resistance to fracture. Our topological approach could therefore enable the computational design of tough inorganic solids, which has long been a ``holy grail'' within the nonmetallic materials chemistry community. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Dates and versions

hal-01454996 , version 1 (03-02-2017)

Identifiers

Cite

Mathieu Bauchy, Bu Wang, Mengyi Wang, Yingtian Yu, Mohammad Javad Abdolhosseini Qomi, et al.. Fracture toughness anomalies: Viewpoint of topological constraint theory. Acta Materialia, 2016, 121, pp.234-239. ⟨10.1016/j.actamat.2016.09.004⟩. ⟨hal-01454996⟩
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