# Fracture

## What happens when a crack gets trapped by an obstacle of higher fracture energy?

The crack adapts instantaneously its propagation speeds. The speed jump amplitude is governed by the crack tip energy balance, as predicted by brittle fracture theory.

*Albertini, G.*, Lebihain, M., Hild, F. Ponson, L. and Kammer, D.S., 2021.
“Effective toughness of heterogeneous materials with rate-dependent fracture energy”,
**Physical Review Letters,** accepted.

# Friction

*How does random local strength affect the static friction coefficient?*

*Albertini, G.*, Karrer, S., Grigoriu, M. D., Kammer, D. S., 2020. “Stochastic Properties of Static Friction”, **Journal of the Mechanics and Physics of Solids,** *in press*.

## Friction is Fracture

*The onset of frictional motion is characterized by the propagation of slip fronts, which – like cracks – break the discrete contacts at the frictional interface allowing sliding to occur.
In this study, we combine friction experiments with fracture-mechanics simulations and theory to study long sought-after interface properties, such as local fracture energy and frictional peak strength.*

Svetlizky, I.^{1}, *Albertini, G.*^{1}, Cohen, G., Kammer, D.S. and Fineberg, J., 2020.
“Dynamic fields at the tip of sub-Rayleigh and supershear frictional rupture fronts”,
**Journal of the Mechanics and Physics of Solids** 137, 103826.

^{1}Equally Contributed

## Earthquake modeling

Ma, X., Hajarolasvadi, S., *Albertini, G.*, Kammer, D.S., Elbanna, A.E., 2019.
“A hybrid finite element-spectral boundary integral approach: Applications to dynamic rupture modeling in unbounded domains”,
**International Journal for Numerical and Analytical Methods in Geomechanics** 43, 1, 317-338.

*Albertini, G.*, Kammer, D.S., 2017.
“Off-fault heterogeneities promote supershear transition of dynamic mode II cracks”,
**Journal of Geophysical Research: Solid Earth** 122, 2017JB014301.