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Arash_Kheradvar's picture

Effect of Fiber Geometry on Pulsatile Pumping and Energy Expenditure

Myocardial fiber orientation is a topic that has recently received much attention in connection with cardiac pumping function. The twisting motion of the cardiac base to apex can be a direct result of this geometric orientation of these fibers. One important question that has not been addressed yet is whether there is any relationship between the contractile energy expenditure and the geometric orientation of myocardial fibers. In the present work, we study the effect of contractile fiber orientation on pumping function.

The sudden throws of rock, coal and gas in the mines

 

 

                           The sudden throws of rock, coal and gas in the mines                      

  • - the natural manifestation of the active shock waves of stretching

 

Qiang Chen's picture

dynamic bending stress analysis in sandwich thin film structure

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Hello,

Does anybody know if there exists an analytical solution for stress distribution in a sandwich like/ multilayered thin films subjected to cyclic bending? The sandwich has line-patterned metal of submicrons in thick and a few microns in width, which was coated/deposited by other material on top and bottom (surrounding as well) with different thickness up to 20 microns.

 

Nanshu Lu's picture

Singular stress fields at corners in flip-chip packages

An electronic device integrates diverse materials, and inevitably contains sharp features, such as interfaces and corners. When the device is subject to thermal and mechanical loads, the corners develop intense stress and are vulnerable sites to initiate failure. This paper analyzes stress fields at corners in flip-chip packages. The stress at a corner is a linear superposition of two modes of singular fields, with one mode being more singular than the other. The amplitudes of the two modes are represented by two stress intensity factors of dissimilar dimensions.

karthik kumar's picture

phd in mechanical eng

Dear Sir.

Greetings!

I am writing to express my interest in obtaining a Research / associate position with your Institutions. I am a Masters Degree Professional in the field of Engineering Design completed from the Amrita University Amrita school of Engineering, Coimbatore, India in July 2007.

Ken P. Chong's picture

MRI-R2 has been posted

The NSF Major Research Instrumentation Program (MRI-R²) Recovery and Reinvestment is now posted. This is a good way to build up the needed major research instrumentation

The deadline for proposals will be August 10, 2009.

A link can be found through the page www.nsf.gov/od/oia/programs/mri (preferred to keep abreast of updates) or through the NSF-wide page at http://www.nsf.gov/funding/pgm_summ.jsp?pims_id=5260.

ansys, composite materials,grp pipe

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hi, i m studieng grp pipes as graduation project and need to modelling the pipe on ansys under inner pressure.

if somebody can help me i ll be very grateful.

the pipe wall contains of 32 layers from glassfiber and epoxy as acomposite material,the layers are [+55(16),-55(16)].

itried to do that using the element shell 91,but i failed.

my mail is yhkasem@yahoo.com.

thanks for any help.

Compression Testing of alumina ceramics

 

Hi all ,

We were doing compression testing of alumina using Instron compression testor. plates used to compress the specimen is made up of Steel. When we applying load in elastic region we are not able to see right deflection because of compliance. Deflection of alumina is not clear as we are getting lots of compliance error. Has anyone faced similar problems. Is changing the steel plate and using any hard material in place of steel is the solution.

 Thanks

 

Crack propagation using VCCT in ABAQUS

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Hello,

I am expected to calculate strain energy release rate for a single lap composite joint using VCCT in ABAQUS.How do I go about it?

The manual saya some thing about debonding? How do i do that in my model?

Thanks,

Srilatha

 

fracture mechanics of functionally graded materials (FGM)

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Hi everybody,

I'm looking for some resources (textbooks,webpages,papers)  to give me some insights into stress analysis and fracture mechanics of functionally graded materials. i appreciate any suggestions.

Thanks.

 

Cracking option in ABAQUS

Dear All,

I am modelling the cracking in concrete in Abaqus CAE using the Brittle cracking option in Abaqus.

Now i want to see the output results (Contours of cracks) like CRACK, CKE, CKSTAT etc.

But i dont know how to see that output

Can some one help me

Thanks

Kind Regards 

 

Mohsin Hamzah's picture

Gough-Stewart robot

I am working on modelling new type Gough-Stewart robot, I have some problems in modelling. Can anyone help with this?

 M Nouri

Compressive Strength of Fabric??

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I am trying to model a rubber impregnated fabric as rebar in Abaqus Standard. It seems that the rebar is only good in uniaxial tension load and it causes convergence problem in bending and compression loading. The fabric and rubber matrix has a compressive strength and that is critical to the model that I am analyzing. What would be a good approach to include compression on fabric rebar? The compressive strength of fabric matrix should be an order of magnitude lower than the tensile strength but I do not have a test data in compressive loading.

Julien Jonvaux's picture

Stress intensity factors for a slanted crack under compression

Hello everyone,

Here is the problem I have: I'm modeling the geometry of a simple straight edge crack in a 2D elastic medium using Abaqus. I assume plain stress conditions. The crack makes an angle with the horizontal, is small enough to be considered as embedded in an infinite domain (ratio crack length/size of domain < 1/10) and I apply a vertical compressive load on top of my domain. I fixed one point in displacement at the bottom of it and the whole bottom edge is constrained not to move vertically.

Laterally loaded pile groups

Hi, I am Ramy, I am about to perform some analyses on laterally loaded pile groups in sandy soils, does anyone have any idea about the best constitutive model to use?, loading is static. And I am using PLaxis 3D foundations version 2.1 Regards, Ramy

abaqus drilling

hi...i am doing drilling simulation on abaqus.... 

it consist of two parts...a tool and a blank.... 

now when i am running analysis...tool touches the blank and goes back. 

i checked material data...density,elasticity...and i used surface to surface interaction with penalty as interaction property.... is there any other data that i need to include....???if yes then how....

can any one tell me ... 

Recruiting a PhD student for FEM modeling background Fall 2010

A PhD research assistant starting Fall 2010 is sought for a student having FEM modeling and mechanics background.

Applying to the graduate program ASAP in Dept. of Civil and Env. Engineering at the University of Connecticut is encouraged. 

RA will be selected from the application pool. 

Please contact jhkim@engr.uconn.edu for questions.

Using Abaqus for cracks in the rocks

Hello Everyone,

 My research is in petroleum geomechanics and I am Using Abaqus for my simulations of cracks and induced fractures in rocks around the wellbore I do have some problms and I will be happy if anybody can assist me:

1- I am interested in looking at Hoop stress at evry point around the wellbore ,but in Abaqus I can only see that in degrees of 0,90,180,270 of circular wellbore by using S1 and S2 ,naybody has a code or experience with that?

2008eml's picture

High Frequency Elastic Wave Propagation (KHz or MHz)

Hi everybody, I'm so interested in analysis of wave propagation in solid medias. and I've started by studying some books like "Ultrasonic wave propagation in solid media"(Rose). My question is about the importance of this analysis  (propagation of high frequency elastic waves) in the structures. I know that the major application is in the field of Nondestructive Testing(NDT). but I don't know if it is usefull in vibrational analysis of mechanical structures (elastic waves with frequencies around KHz or MHz). is this study important in "dynamic response analysis" of mechanical structures in some special kind of loading like impact? I'd be gratefull if you could introduce me some examples.

Women in Computational Mechanics

Hi, I am Ms Zartasha Mustansar from the University of Manchester. I am currently working towards my PhD, funded by Microsoft and the Dorothy Hodgkins Postgraduate Award scheme. I am working in the Palaeontology Research Group, headed by Dr Phil Manning, who together with my supervisor Dr Lee Margetts, are leading the development of a new discipline "Computer Aided Palaeontology".

Solver for XFEM

In the FEM book by KJ Bathe and also in the fem book by G.Dhatt, it is said the direct solvers are generally more convenient than iterative solvers and new versions of them include reordering and efficient use of skyline method. In contrast there are iterative solvers with capability to directly manipulate sparse format of matrices. I am now working on XFEM coding with C++ and don't know what type of solver would be the best for XFEM. the conditioning issues of matrices obtained from XFEM would be a difficulty for the choice of preconditioners.

GI GII GIII computation in Rubber composites like tires (Comparaison between methods)

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2009-04-24 17:16:02

Hi all,

I am currently in my second year in Engineering school in France. I am doing research on 3D crack propagation in Rubber composites like tires.

And I wonder what is the best method to compute GI, GII and GIII. I have difficulties to choose between methods like EDI and VCCT for example.

I work in the finite strains case with static and dynamic. I also have difficulties to find papers on this subject with comparisons.

Can anyone please help me out with that

Thank You

Best Regards

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