Michael Ortiz

TL;DR: In this paper, a variational-based spatial adaptivity is proposed for a phase-field model of fracture, which allows a spatial variation of the regularisation length in the energy functional.

TL;DR: In this article, the authors present numerical evidence that twinning operates as an accommodation and relaxation mechanism in graphene and show that twins may arise spontaneously in graphene layers containing arrays of dislocations.

TL;DR: In this article, the authors describe fatigue processes within the framework of cohesive theories of fracture, and they assume that the unloading-reloading response of the cohesive model degrades with the number of cycles and assume the reloading stiffness as damage variable.

TL;DR: Wave propagation in the human cranium is investigated by means of a finite-element model that accounts for the anatomy, elasticity and viscoelasticity of the skull and brain and shows that, when a region on the frontal lobe is subjected to FUS, the skull acts as a wave guide for shear waves, resulting in their propagation to off-target structures such as the cochlea.

TL;DR: In this paper, the authors investigated possible improvements in the combustion properties of multicomponent solid propellants through the application of topology optimization methods to representative volume elemments, and proposed a method to improve the combustion performance of a single-input single-output (SISO) solid propellant.