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Bulge test at nano-scale: The surface effects

Submitted by tongqing.lu on
research
nano-scale
surface effects
bulge test
Bulge test is an effective technique to measure the mechanical properties of thin films. As the membrane size decreases to nano-scale, the surface effect plays a significant role in determining the mechanical behavior of the membrane, and the techniques commonly used to measure the bulk materials properties are not applicable. We explore the surface effect on the nano-scale bulge test using combined continuum theories and atomistic simulations. We formulate the load-deflection relation by incorporating the surface effect and analyze its size-dependent behavior. The present theoretical model is in quantitative agreement with the molecular dynamics simulations.

Concrete-Filled Steel Tubular (CFST) short columns

Submitted by vipul-patel on
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Hi

 I am working on the nonlinear inelastic analysis of concrete-filled steel tubular (CFST) short columns under axial loading. How do I use RIKS method availbale in ABAQUS? This method is used to apply load. How do I use load-control method in ABAQUS? How do I obtain load-strain curve for CFST column?

Best regards,

Vipul Patel

Influence of temperature and free edges on the mechanical properties of graphene.

Submitted by Nuwan Dewapriya on
research
molecular dynamics
nanomechanics
surface energy
graphene
strain rate dependence
initial strain
temperature dependent properties
graphene nano-ribbon
Thermostat
thermal expansion
Kinetic analysis
stress strain response
atomistic modelling

I would like to share with you my first paper in a SCI journal: doi:10.1088/0965-0393/21/6/065017

Higher-order adaptive finite-element methods for Kohn-Sham density functional theory

Submitted by Vikram Gavini on
research
finite elements
electronic structure
density functional theory
ab-initio calculations
real space

Dear Colleagues,

I wish to share with you our recent article on "Higher-order adaptive finite-element method for Kohn-Sham density functional theory", which will soon appear in the Journal of Computational Physics. Below is the abstract and attached is a preprint of the article.

P. Motamarri, N.R. Nowak, K. Leiter, J. Knap, V. Gavini, Higher-order adaptive finite-element methods for Kohn-Sham density functional theory, J. Comp. Phys. 253, 308-343 (2013).

Saturated Soil Material Property in abaqus

Submitted by rahul_umkc on
research
Poroelastic soil Material in Abaqus

Hello everyone,

I need an urgent help. I have no idea how to define two phase poroelastic soil in abaqus. Water and soil should be treated as two different materials rather than a single material. And how to define the poroelasticity (saturated soil). Can abaqus perform these analysis.

(1) Coupled quasi-static for saturated soil

(2) Coupled dynamic for saturated soil (the UEL/UMAT) -- this is
reported as a UMAT.
Please help me how to sdo these steps and how to define UEL/UMAT
Regards
Rahul
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