Skip to main content

Blog posts

Continuous and discrete microstructured materials with null Poisson's ratio

Submitted by Giorgio Carta on

In this paper we propose diff erent classes of isotropic microstructured media with tunable Poisson's ratio. The elastic periodic systems are continuous porous media and two- and three-dimensional lattices. The microstructural parameters can be tuned in order to have an eff ective Poisson's ratio equal to zero. The connection between microstructural parameters and eff ective properties is shown in detail both analytically and numerically.

 

Continuous system with null Poisson's ratio:

Design of a porous material with isotropic negative Poisson's ratio

Submitted by Giorgio Carta on

This paper proposes the design of a two-dimensional porous solid with omnidirectional negative Poisson's ratio. The hexagonal periodic distribution of the pores makes the e ffective behavior isotropic. Both experimental tests and numerical simulations have been performed to determine the e ffective properties of the porous solid. A parametric study on the e ffect of the geometrical microstructural parameters is also presented. This auxetic structure is easy to fabricate and can be very useful in several engineering applications.

 

2016 Melosh Medal Winner and Finalists

Submitted by Guglielmo_Scovazzi on

The 2016 winner of the Robert J. Melosh Medal is Maruti Kumar Munuduru, with the paper “Structure-Preserving Finite Element Formulations for Advective-Diffusive-Reactive Systems.” Maruti earned a Ph.D. Degree from the University of Houston, and is currently a post-doctoral appointee at Los Alamos National Laboratory.

 

The other five finalists in the competition were (in alphabetical order):

Journal Club Theme of May 2016: Recent Progress in Curvilinear Electronics and Mechanics

Submitted by Jianliang Xiao on

Recent Progress in Curvilinear Electronics and Mechanics

Jianliang Xiao

Department of Mechanical Engineering, University of Colorado Boulder

1. Introduction

Quantifying dislocation microstructure evolution and cyclic hardening in fatigued face-centered cubic single crystals

Submitted by ahmed.hussein on

Discrete dislocation dynamics simulations were performed to investigate the dislocation microstructure evolution and cyclic hardening during the early stages of fatigue loading in nickel single crystals. The effects of the crystal size and initial dislocation densities on both the mechanical response and the evolution of dislocation microstructure were quantified. Crystals having an initial dislocation density of 1012  m−2 and diameter less than  do not show any dislocation density multiplication or cyclic hardening.

Simpleware workshop at ETH Zurich, May 11 2016

Submitted by Simpleware on

Introduction and Live Demo: 3D Image Visualisation, Analysis and Model Generation with Simpleware

Date: Wednesday, May 11, 2016

Time: 9:00 am - 12:00 pm

Location: Swiss Federal Institute of Technology Zurich (ETH), Building ETZ, Gloriastrasse 35, Zurich, Switzerland

Who should attend

positions available for PhD students, visiting students, or visiting scholars

Submitted by songbai on

We have PhD student positions available who are interested in soft tissue biomechanics of the brain. Work will involve developing sophysticated, yet efficient computational models of the human brain to study the mechanisms of brain injury. This work is supported by NIH grants.

In addition, we have openings for visiting students or visiting scholars who have their own funding to stay in the lab. 

Interested applicants please contact: Songbai.Ji [at] dartmouth.edu

For visiting positions, please clarify your funding sources and the eligibility to work in the lab.

Finding drag and lift coefficients using Ansys APDL and/or fluent?

Submitted by amin013 on

Basically, I want to find the lift and drag coefficients for a fluid (air) flowing over a prismatic triangular cross-section, any suggestions, where  can I find some tutorials to begin with.

After I get started, I'm interested to find those coefficients for different angles of attack.