research
Surrogate Modeling Accelerated Shape Optimization of Deployable Composite Tape-Spring Hinges
Composite tape-spring hinge (CTSH) is a simple yet elegant mechanical component for various deployable space structures. This paper formulates and addresses cut-out shape optimization of a CTSH, which is seldom touched upon in literature. Both the maximum strain energy stored during the folding process as well as the maximum bending moment during deployment were maximized in a concurrent way, and the multi-objective optimization problem was realized by merging data-driven surrogate modeling and shape optimization.
EndoBeams.jl: A Julia finite element package for beam-to-surface contact problems in cardiovascular mechanics
Please take a look at the paper of our PhD student Beatrice Bisighini in Advances in Engineering Software: "EndoBeams.jl: A Julia finite element package for beam-to-surface contact problems in cardiovascular mechanics". We propose an efficient framework for modelling beam-to-surface contact, specifically designed to model endovascular devices.
You can find the paper (open-access) here: https://www.sciencedirect.com/science/article/pii/S0965997822000849
A simple power law for the shape of spontaneously formed 2D crystal bubbles
Dear iMechanicians,
I want to share our recent work published in IJSS on the mechanics of spontaneously formed 2D crystal bubbles.
Two-dimensional crystals on adhesive substrates subjected to uniform transverse pressure
Zhaohe Dai, Yifan Rao, and Nanshu Lu
Mechanics of tension-induced film wrinkling and restabilization: a review
Wrinkling of thin films under tension is omnipresent in nature and modern industry, a phenomenon which has aroused considerable attention during the past two decades because of its intricate nonlinear behaviors and intriguing morphology changes.
Journal Club for July 2022: Liquid crystal elastomers: programming, multifunctionality, and opportunities
Xueju (Sophie) Wang, Department of Materials Science and Engineering; Polymer Program, Institute of Materials Science, University of Connecticut
A consistent finite-strain plate model for wrinkling of stretched anisotropic hyperelastic films
Stretch-induced wrinkles usually occur in a thin, clamped-clamped, hyperelastic film and eventually disappear upon excess stretching, with wrinkling direction being perpendicular to the stretching direction within isotropic elasticity framework. Here, we consider in-plane anisotropy induced by infilling fibers in thin films, which significantly affects the orientation and amplitude of wrinkles.
Improved formulas of extensional and bending stiffnesses of rectangular nanorods
Improved formulas of extensional and bending stiffnesses of isotropic rectangular nanorods are derived. These formulas reduce to the existing widely used formulas for a special choice of material parameters, i.e., when the surface Poisson's ratio and the bulk Poisson's ratio match thus highlighting the limitation of the existing formulas.
Post-Touchdown Dynamics of an Electrostatically Actuated MEMS Device
Dear Colleague
Our (open access) paper on the post-touchdown dynamics of an electrostatically actuated MEMS device has just appeared in IJSS:
Nate N. Goldberg and Oliver M. O'Reilly, Electrostatically actuated MEMS in the post-touchdown regime: The thin-dielectric limit and a novel reduced-order model for release dynamics"
Graphical Abstract can be found here