Our paper Thermal fluctuations (eventually) unfold nanoscale origami was published in a special issue of Journal of the Physics and Mechanics of Solids
I was invited to give a talk at EASF. You can see the recording here.
Dam breaking problem
(all fluid dynamics examples shown were simulated using my open-source lattice Boltzmann method code: lbxflow)
statistical mechanics
thermodynamics
soft multifunctional materials
electroelasticity
solid mechanics
non-Newtonian fluid dynamics
multiphase and reactive fluid dynamics
polymer matrix composites
origami mathematics and mechanics
A vertex with five folds has two degrees of freedom. Those degrees of freedom (in terms of changes in fold angles) are shown via the two column matrix on the right.
A vertex with five folds has two degrees of freedom. Those degrees of freedom (in terms of changes in fold angles) are shown via the two column matrix on the right.
Asymmetric folding of an eight-fold waterbomb
Mathematical folding of a six-fold waterbomb
Mathematical folding of an 128-fold waterbomb
The performance of dielectric elastomer actuators (DEAs) can be improved by controlling the way polymer chains are oriented in the cross-linked network such that the DE is transversely isotropic~\cite{grasinger2019multiscale}. (a) and (b) show the reference and deformed configuration for the typical mode of actuation of DEA; (c) and (d) show the unit cell of a material point corresponding to (a) and (b), respectively. The polarization of the individual chains are shown as gold arrows and the deformation occurs, in part, because the chain polarization vectors want to align with the electric field. (e) and (f) show two possible designs of chain orientations where red denotes a higher density of chains and blue a lower density of chains. (g) shows the usable work as a function of the normalized voltage for various design DEs. Note: a vertical drop at the end of a data series denotes the failure of that material and $\theta_0 = \theta_{\text{iso}}$ signifies the standard isotropic DE. The efficiency (usable work per voltage for a given voltage) and/or maximum usable work (before failure) can be improved by properly designing the DE network.
(see doi.org/10.1039/D0SM00845A; doi.org/10.1016/j.jmps.2020.104171; further publication of this work is in progress, more detail can be found in my dissertation)
Dam breaking problem with a Newtonian fluid;
Bingham number equals 0
Dam breaking problem with a yield-stress fluid; Bingham number equals 10
Dam breaking problem with a yield-stress fluid; Bingham number equals 25
Simulation of wellbore cementing (i.e. wellbore completion). Filling an empty cavity with a yield-stress fluid: Re=3, Bn=1
Simulation of wellbore cementing (i.e. wellbore completion). Filling an empty cavity with a yield-stress fluid: Re=3, Bn=1
Simulation of wellbore cementing (i.e. wellbore completion). Filling an empty cavity with a yield-stress fluid: Re=3, Bn=1