research

Recent paper on the flattening deformation of metal columns

Submitted by Seyed Ahmad Elahi on Wed, 10/16/2013 - 16:44

This paper presents a theoretical and
experimental study on lateral compression of square and rectangular metal
columns. Some theoretical relations are derived to predict the absorbed energy,
the specific absorbed energy and the instantaneous lateral load during the
lateral compression. Analytical relations are obtained in two stages: elastic
and plastic parts. In the plastic zone, the total absorbed energy by the column
is calculated, based on the energy method. Then, an analytical equation is
derived to predict the instantaneous lateral load. In the elastic part, the
instantaneous load is obtained by linear behavior assumption. To verify the

Math Kernel Library MKL

Submitted by Echeban on Mon, 10/14/2013 - 22:08

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Computational Mechanics Forum

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I want to use Intel Math Kernel Library (MKL) to calculate the bifurcation loads and modes in my custom FE program. MKL has many algorithms and I want to use the most efficient one.

Basically, I need to find a few eigenvalues lambda_i and eigenvectors u_i for the problem

KG * u = lambda * KS * u

where KG is the stiffness matrix and KS is the geometric stiffness matrix, also called stress-displacement matrix.

Is KG supposed to be positive definite?

User subroutine UEXPAN

Submitted by dingzhiwei007@… on Fri, 10/11/2013 - 17:41

research

UEXPAN

Hi all,

I recently study on a materials's expansion behavior. I am wondering if anyone have used the subroutine UEXPAN. It will much appreicated if you could provide me a sample.

Hope to see some response.

Best Regards

Zhiwei

Measurements of the Fracture Energy of Lithiated Silicon Electrodes of Li-ion Batteries

Submitted by Matt Pharr on Fri, 10/11/2013 - 13:31

lithium-ion batteries

How to use USDFLD request variables from other elements in ABAQUS

Submitted by iampuchao on Thu, 10/10/2013 - 14:19

research

ABAQUS

User subroutines in ABAQUS

Hi all,

Virtual Special Issue: CFD simulation of pedestrian-level wind conditions around buildings: past achievements and prospects

Submitted by Laure Ballu on Thu, 10/10/2013 - 13:31

industrial aerodynamics

pedestrian

windbreaks

This Virtual Specail Issue deals with papers on CFD simulation of pedestrian-level wind conditions around buildings, published in the Journal of Wind Engineering and Industrial Aerodynamics (JWEIA).

Force and stroke of a hydrogel actuator

Submitted by Widusha Illeperuma on Thu, 10/10/2013 - 12:32

Hydrogels that undergo a volume phase transition in response to an
external stimulus are of great interest because of their possible use as
actuator materials. The performance of an actuator material is normally
characterized by its force–stroke curve, but little is known about the
force–stroke behavior of hydrogels. We use the theory of the ideal
elastomeric gel to predict the force–stroke curves of a
temperature-sensitive hydrogel and introduce an experimental method for
measuring the curve. The technique is applied to PNIPAm hydrogels with
low cross-link densities. The maximum force generated by the hydrogel
increases with increasing cross-link density, while the maximum stroke

True Stress-Strain curve of metals

Submitted by PenPen on Thu, 10/10/2013 - 07:39

research

stress analysis

strength coefficient

strain-hardening exponent

Hi everyone!

I was hopping to find some help over here. I just need some references or links to the true stress-strain curves of differents metals. I'm working with Tin and i'm going to do run some compression test to valid an analitic method. In order to do this, I need the strain-hardening exponent (n) and the strength coefficient (C) and it's being impossible to find those.