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Journal Club Theme of December 2009: Impact Behaviour of Materials with Cellular Structures

Submitted by Henry Tan on
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Journal Club Forum
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impact
Journal Club Forum
cellular materials

Welcome to the forum! Discussion topics were suggested initially as follow:

Metal foams, cell deformation (bending, buckling, plasticity and fracture), constitutive stress-strain behaviour of cellular materials, energy absorption, hypervelocity impact, shock wave behaviour, 1D shock modelling, shock attenuation, shock enhancement, Material Point Method (MPM) simulation and microscopic tomography experimental observation;

and later were extended to many related:

A new Technical Committee on Soft Materials

Submitted by Zhigang Suo on
mechanician

A growing number of mechanicians are entering the field of soft materials, such as polymers, gels, and tissues. While they interact with researchers in technical societies traditionally identified with the field, they also maintain connection with researchers in applied mechanics.

Course Announcement: EM 600 Aeroelasticity (Dept of Aerospace Engineering & Engineering Mechanics, San Diego State University)

Submitted by luciano demasi on
aeroelasticity
doublet lattice method

Hi all,

A new Aeroelasticy course is offered at San Diego State University. 

Course Description

VUMAT for Nitinol --- why VUMAT and not UMAT?

Submitted by cece83 on
research
Nitinol
VUMAT
Abaqus/Explicit

Dear all,

 I'm new in imechanica. I need some informations about VUMAT for Nitinol. I would like to implement in fortran a subroutine for the behaviour of shape memory alloy.I looked for some subroutines already implemented but they have been developed in the implicit way.

It's true that with the VUMAT(explicit) I could have some problems of stability and convergence.Could someone suggest me any reason to make this model in the VUMAT?I know that in VUMAT I can't redifine the time increment so before running the analysis It's important to pay attention on Dt.

Fracture mechanics

Submitted by vinay kumar B A on

hi all..

 

i am having one doubt, please help me.

 

In a isotropic plate,  if crack tip is present then to model the crack tip we use quarter point element ( IN ANSYS).

if we wants to model more than one crack tip than ,, ansys will give following error

" Only one stress concentration can be specified per area"

Please let me know what is the procedure to model more than one crack tip.

Thanking you

vinaya 

 

Help needed with interpretation of received P h curves during NANOINDENTATION

Submitted by Anna Dolgran on
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nanoindentation
elastic modulus

Dear iMechanicas,

 

I just started doing nanoindentation tests on dry biological samples (wood) with a flat punch tip and I have problems analyzing the results! I would be happy if anybody could give me some suggestions.

While running a test I receive quiet good force-displacement curves (no adhesion, good surface find, no time-depend behavior) but the values for the recieved elastic modulus are not stable! The value scatters over the whole range of displacement.

18th Annual International Conference on COMPOSITES/NANO ENGINEERING (ICCE -18), Anchorage, Alaska,USA, July 4-10, 2010

Submitted by Xiangfa Wu on
conference
nanocomposites
mechanics
Composites

The Eighteenth Annual International Conference on
COMPOSITES/NANO ENGINEERING (ICCE - 18)
ICCE-18 Anchorage, Alaska,USA, July 4-10, 2010
http://myweb.polyu.edu.hk/~mmktlau/ICCE/ICCE_Main.htm

Message from ICCE Chairman

modelling of rectangular composite plates using ANSYS

Submitted by sharma_avadesh on
education

I have to analyse the carbon/epoxy composite laminate in ANSYS,  to determine the natural frequency of rectangular composite plates. The plate is simply supported . I  am not able to model the composite lay up with the correct orientation of the fibre. so any body have the step by step procedure for modelling the composite lay up in ANSYS and how to determine natural frequencies  please give it to me on my e-mail:  sharma_avadesh [at] yahoo.com

plastic analysis of a plate containing an edge notch and a piezoelectric inhomogeniety with ansys

Submitted by rojin on
research

Hi,

I am rojin ghandriz,study M.c civil engeeniring at sharif university in iran,

I study on my tesis a bout plastic analysis of a plate containing an edge notch and a piezoelectric inhomogeniety.

I have questions a bout the crack initiation in Ansys v11.0..How could i get initiation of crack whit increasing tensile loading on plate in ansys?

thanks

rojin

Rac activation by stress does not depend on Src

Submitted by Ning Wang on
research
biomechanics

It is known that platelet derived growth factor (PDGF) induced Rac activation depends on Src activity. However, we find that a local stress of physiologic magnitude via integrins can directly activate Rac GTPase rapidly, independent of the Src activity. Our finding on the stress-induced rapid Rac activation challenges the conventional wisdom on mechanotransduction and suggests that stress-induced signaling via focal adhesions does not follow signal transduction pathways induced by growth factors. To view the whole paper:

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