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dispersive and nondispersive results!

Submitted by amceuma on

Hi dear friends 

I am working about wave propagation modeling in solids. in FEM for 1D beam model when governed differential equation of motion is solving by central difference method the output results of displacement are nondispersive but by using MATLAB "lsim" command for simulation of LTI system for arbitrary inputs, the outputs are dispersive which we expect this phenomenon will be happen in beam like models!

in bar models both methods leads to nondispersive results which is resonable.

could you help me? 

Call for abstracts: Symposium on "Multiscale Mechanics of Polymers, Soft and Biological Materials"

Submitted by m.semkiv on
conference

Symposium "Multiscale Mechanics of Polymers, Soft and Biological Materials"

http://mmm2014berkeley.iop.org/Symposium_B

at the 7th International Conference on Multiscale Materials Modeling (Oct 6-10, 2014)

http://mmm2014berkeley.iop.org/home

Abstract submission deadline: February 28, 2014

 

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Postdoc position — Modeling fragmentation in brittle materials

Submitted by ndaphalapurkar on
job
crack propagation
dynamic fragmentation
statistics of fragment distributions
Hopkins Extreme Materials Institute (HEMI; hemi.jhu.edu) of The Johns Hopkins University is seeking a Postdoctoral Fellow to work on modeling fragmentation in brittle materials under extreme loading conditions. The potential candidate should have a Ph.D., with some background in fracture mechanics and experience working with the finite element or some other numerical method.

Post Doctoral Research Associate at Loughborough University

Submitted by Anish Roy on
Plasticity
materials modeling
Constitutive modelling
postdoc
postdoctoral position
seeking an opportunity for postdoctoral or visiting research
Machining simulation
Machining
MODELLING OF ADVANCED MATERIALS FOR SIMULATION OF TRANSFORMATIVE MANUFACTURING PROCESSES 
 
The project will form one of the integral parts of a collaborative UK/India research grant, which is funded by the EPSRC and the Department of Science and Technology, Government of India.
Duration: 1 year
Deadline for application: 25 March 2014  
 

The projects aims to:

 

Questions about UEL

Submitted by ashkan khalili on
ABAQUS
UEL
subroutines
Hi everybody,

I have a UEL for truss element (T3D2). I'm calling and reading some .dat files inside of the UEL. I'm just reading these files inside of the UEL without doing anything to them or with them (It's just a test case). Here is an example:
 
      OPEN(101, file="C:\Users\ak1070\Desktop\UMAT-UEL-UELMAT\UEL TEST\V1.dat", status='old',form='formatted',&

Comparing experimental fracture properties and micromechanical (or global-local/multiscale) finite element simulations

Submitted by prathyush963 on
research
fracture mechanics
finite element analysis
composite materials
multiscale modeling
Micromechanical modeling
Flexure
global-local

I am interested in developing a global-local finite element model (micro/macro) to simulate flexural testing of a composite material. Flexural loading will be applied on global model (macro) and crack propagation will be simulated in the local model (micro). I want to compare stress intensity factor or any other fracture property obtained from local model (micro) with that of experimental results.

I would appreciate if anyone could suggest some references/literature in this area. Any kind of suggestions would be great!

 Venkata

MS, PhD Candidate Positions on Computational Simulation of Composite Materials and Structures in Hanyang University, South Korea

Submitted by sungha on
education
Fatigue
computer simulation of composites
multi-scale analysis of composites
progressive failure

MS, PhD candidates for fall semester-2014 on computational simulation of composite materials and structures are available in Hanyang University, South Korea.

Microplane modeling of shape memory alloy tubes under tension, torsion, and proportional tension–torsion loading

Submitted by R.Mehrabi on
research
Shape memory alloy
constitutive modeling
proportional loading

In this paper, a phenomenological constitutive
model based on microplane model is used to simulate tension, torsion and proportional tension-torsion on NiTi thin-walled tube. Validation of the
microplane model against experimental results in different loading conditions demonstrates
the capability of this approach.
This publication will benefit the numerical and experimental study on SMAs.

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13th Congress of Computational Mechanics, October 2-3, Chile

Submitted by ksaavedra on
conference
computational mechanics
numerical methods
computational modelling
Dear colleague,

The University of Talca and the Chilean Society of Computational Mechanics invite professionals, academics, researchers and students to the XIII Jornadas de Mecánica Computacional (XIII Congress of Computational Mechanics), to be held on October 2-3, 2014 at the University of Talca, campus Curicó, Chile.

The call for abstracts closes on June 6th. More details about submission and registration are available on www.jmc2014.utalca.cl.

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