research
Complex Ordered Patterns in Mechanical Instability Induced Geometrically Frustrated Triangular Cellular Structures
We have studied how complex ordered patterns can appear from buckling-induced geometrically frustrated triangular cellular structures.
The paper is selected as the Physical Review Letters Editors' Suggestion and highlighted in Physics Synopsis as the link below.
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.098701
abstract:
Research notes: March 6, 2014
Earth science: Missing link in mantle dynamics
http://www.nature.com/nature/journal/v507/n7490/full/nature13064.html
Disclinations provide the missing mechanism for deforming olivine-rich rocks in the mantle
http://www.nature.com/nature/journal/v507/n7490/full/nature13043.html
Abstract:
Periodic Boundary Conditions vs Homogenous Boundary Conditions in 2D RVE
Hello all,
I want to simulate loading of 2D RVE of dual phase steels, by giving individual phases properties, to get homogenised mechanical properties like yield strength, % elongation etc, using micromechanics based approach. Litterature shows people have used two kinds of boundary condition viz. Periodic boundary condition and homogenous boundary condition for this case. My doubt is two folds:
1) What is the theoretical difference between these two kinds of boundary conditions?
Can someone explain the strange physical behavior in contact problem using Lagrange method in modeling a simple 2D indentation?
I am modelling a very simple 2D contact problem between a rigid indenter and a deformable squared-shape specimen. I used a implicit function f to describe the rigid indenter.
The contact condition is: Inside the contact zone of the deformable specimen, a node n is outside of rigid indenter for f(n)>0, and inside for f(n)<0. In case f(n)=0, the contacting node lies on the surface of the rigid body.
Is the CST element more accurate than bilinear element (Q4) for bending problems?
I did a 2D beam bending problem with CST and Q4 element, respectively. CST gives better accuracy. Is it due to the shear locking effect with Q4?
FSI issue in abaqus co-simulation: misaligned nodes
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Hi everyone,
I am performing FSI simulation under abaqus.
The simulation consists in a porous solid (elastic isotrope and homogeneous under Abaqus/explicit) filled by a non newtonian (viscous fluid under Abaqus/CFD). The whole is contained in a cubic shell in order to apply proper boundary condition.
Hydrogenation-Assisted Graphene Origami (HAGO)
Hydrogenation-Assisted Graphene Origami and Its Application in Programmable Molecular Mass Uptake, Storage, and Release
Shuze Zhu and Teng Li, ACS Nano, 8 (3), pp 2864–2872 (2014)
Symposium on New Developments in Defect Mechanics - a unique intellectual event
Faculty from Caltech, UC Berkeley , University of Michigan, Georgia Tech, Brown University, University of Calgary, University of Pennsylvania, UCLA, Johns Hopkins University, Imperial College, London, and UCSD and researchers from the Lawrence Livermore National Laboratories congregated to UCSD on January 18-19, 2014 to attend the third in a series of symposia on Multiscale Dislocation Dynamics and to honor Professor Michael Ortiz on his 60th birthday. Faculty also brought their graduate students and postdocs to engage in such a powerful intellectual activity.