# Concurrent factors determine toughening in the hydraulic fracture of poroelastic composites

## TL;DR

This paper investigates how hydraulic coupling in poroelastic composites can enhance toughness by promoting distributed cracking, with implications for designing flaw-insensitive, tougher materials.

## Contribution

It extends a previous model to analyze how material and loading parameters influence toughness through crack distribution mechanisms.

## Key findings

- Rapid loading promotes distributed cracking and increases toughness.
- Hydraulic coupling enables flaw-insensitive toughening in composites.
- Theoretical results suggest new material architectures for higher toughness.

## Abstract

Brittle materials fail catastrophically. In consequence of their limited flaw-tolerance, failure occurs by localized fracture and is typically a dynamic process. Recently, experiments on epithelial cell monolayers have revealed that this scenario can be significantly modified when the material susceptible to cracking is adhered to a hydrogel substrate. Thanks to the hydraulic coupling between the brittle layer and the poroelastic substrate, such a composite can develop a toughening mechanism that relies on the simultaneous growth of multiple cracks. Here, we study this remarkable behaviour by means of a detailed model, and explore how the material and loading parameters concur in determining the macroscopic toughness of the system. By extending a previous study, our results show that rapid loading conveys material toughness by promoting distributed cracking. Moreover, our theoretical findings may suggest innovative architectures of flaw-insensitive materials with higher toughness.