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Determination of Density of Laminated Composite

Submitted by Amin Khajeh on
research
Determining Density of laminated composite.

Dear Engineers,

 I would like to determine the density of laminated composite which consists of one lamina E-Glass/Epoxy and another one is thin layer of steel plate due to determining Young's Modulus through non-diestructive technique-Impulse excitation.

Any suggestions would be welcome.

 

var vglnk = { api_url: '//api.viglink.com/api', key: 'a187ca0f52aa99eb8b5c172d5d93c05b' };

var vglnk = { api_url: '//api.viglink.com/api', key: 'a187ca0f52aa99eb8b5c172d5d93c05b' };

Abaqus Subroutine and python subscripting

Submitted by rajnish0007 on
research

Dear All, 

I was wondering if anyone used abaqus user subroutines to couple the micro and macro models? If any one has used it and is also willing to share the knowledge?

I am looking for some guidance on how to run another *inp and get it's out put in the subroutine. any example on this is greatly appreciated. 

Recent paper on the flattening deformation of metal columns

Submitted by Seyed Ahmad Elahi on
research
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
Forums
Computational Mechanics Forum
Choose a channel featured in the header of iMechanica
research
Free Tags
buckling
eigenvalue
eigenmodes
bifurcation buckling
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?

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

Submitted by Laure Ballu on
research
thermal
construction
WIND engineering
CFD simulation
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
research
suo group research
hydrogel
Vlassak group

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
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.

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