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Viscoelastic properties

Hi I am new to this blog as well as new to Viscoelasticity.  I have some basic quiries on viscoelasticity...as I am beginner to this area.

I am working on a polymer viscoelastic fluid filled with abrasive (Silicon carbide particles) for finishing of metal surfaces.This composition (polymer viscoelastic fluid + abrasive particles) placed in a cylinder and pushed through the hollow cylinderical workpiece with certain extrusion pressure excerted by piston. Due to piston pressure, the abrasives in the composition will abrade the workpiece surface. 

Ansys Shell181

Hi All

I am trying to use Shell181 elements to model carbon/epoxy unidirectional composites. When tried to use anisotropic material model ansys wants me to enter coefficients D11 to D21. I am not sure how to calculate the value of these coefficients or where to get their value from. Some help in this regard will be much appreciated. Thank you

Regards

Maajid

Ansys Help

Hi All

I have just started my postgraduation in aerospace composites. I am new to FE of composites and required serious help in learning composite modelling. It will great if someone can help me in starting up. If you know any websites or books which have examples which I can go through to learn modelling of composites, please let me know. Thanks for your help.

Regards

Maajid

conformity in parition of unity method

what is meant by coformity in FEM context and how partition of unity method ensure conformity?

is it interelement continuity if it is then how interelement continuity is ensured in partition of unity method(meshless) please help

Shunlai.Zang's picture

What are the differences between "strain hardening" and "work hardening"?

I think the concepts from the constitutive theory, but in many papers the researchers seem that they dont differentiate them.  So could you give me an exact explanation about it?  Thank you.

Shun lai Zang  
B.Eng, MSc, PhD
Lectuer in Material Science and Engineering

School of Mechanical Engineering
Xi'an Jiaotong University
Xi'an ,Shaanxi,China

Yiled theory coefficients?

Can anyone plz send me instructions on how to calculate the coefficients a,b,c,d,h (f,g = 1)  for YLD91 and subsequent ones? I have a rough idea, but if someone has explicit instructions ..

WaiChing Sun's picture

infinite finite elements

Hello, does anyone know where I can find more information about the infinite finite element or way to couple BEM/FEM to solve the problem in infinite 3D domain? Moreover, what is the difference between using a very long/large finite element and an infinite element?  Many thanks... 

How to get residual stress, Given HV--True Strain Curve and HV--Position from the surface Curve?

Hi, Everyone,

     I have done an experiment, and got the HV(microhardness)--True strain curve, and the Cuver of HV(microhardness)--Position from the sample surface.

 

    Now I want to know how to compute Residual stress? according to the the upper information.

 

    It would be very kind of you to give any suggestions.  Thanks in advance.

   

    Best Regards

    Databa

    2009.Sept. 17

biocompatible thin films

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Can someone suggest the biocompatible polymeric thin films and solution associated with the adhesion of these films on biocompatible metallic/polymeric thin films

Not converged for modelling crack propagation

Hello! I am modelling crack propagation in concrete specimen under direct tension by using cohesive element in ABAQUS as the interface where crack will propagate. By setting up the proper values of the parameters, I could model the exact behavior prior to the cracking, however, when changing some parameters to get the interface cracked, the model committed to be diversed. I have tried some little skills like viscosity and energy disspation fraction, but it was still not working.

Applying Non-Uniform Distributed Forces/Pressures in Abaqus

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Free Tags: 

 I am working on a problem involving wind-tunnel testing of a component. Basically, the component has numerous pressure tappings on its surface to measure the pressure in the wind tunnel. I am required to apply these pressure measurements into the Abaqus model. I am looking for some suggestions as to how best to accomplish this. Basically, the output from the pressure tappings looks like this (I moitted some details...):

SN    X    Y    Z    CP    Local Pressure (Nm-2)    NX    NY    NZ    Wetted Area (m2)    Normal Force (N)    Fx    Fy    Fz

Miniature disk bend testing and its fixture design

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hii

I  need a bit help in preparing my seminar topic on the subject "Miniature disk bend testing".If anyone can help me out from this problem i will be indebted for life time.

    You can post me the link, sites, any information on my email  id- bapu285@gmail.com.

waiting for a reply.

please help me out from this problem

                                   Durgamadhaba Tripathy

Miniature disk bend testing

Hello everybody

     Thanks for your loads of response and I am glad that you have given such valuable data regarding MDBT.

M ostly I need some more data reagarding MDBT and its fixture design.What should be the exact design procedure to perform this test and what should be the exact circumstances and precautions need to be taken are the concerned area where I need your help.
Its hearty request to help me sort out my problem and let me help in this regard.

Immediate Vacancy Exists in Computational Nanomechanics

An Immediate vacancy exists for high calibre  postdoctoral fellows with interest in multiscale computational nanomechanics, nano-modified composites,  testing and validation. Specifically, we are interested in determining the influence of nanofillers on polymer composites. Candidates should expect excellent facilities, good salaries and exceptional working conditions.

Viscoelastic Maxwell - *mat model in LS-Dyna

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Hi, everybody!

YALDA

HI ,

I AM A NAVAL ARCHITECT, MSC STUDENT, MY MS PROJECT IS ABOUT  ELASTIC BUCKLING OF PLATES WITH VARIABLE (LINEAR AND NONLINEAR) THICKNESS USING FEM . I MUST WRITE A MATLAB CODE FOR MY PROJECT . I HOPE I GET SOME GOOD INFORMATION FROM MY FRIENDS IN THIS FORUM.

GOOD DAY.

zishun liu's picture

International Journal of Applied Mechanics (IJAM)

On behalf of Imperial College Press, World Scientific Publishing Co. (Singapore) and the International Journal of Applied Mechanics (IJAM), I would like to invite you to submit an article for our forthcoming journal, which will be launched in March 2009.  Given your expertise in Mechanics, your contribution to the inaugural issues of IJAM would be most desirable in our effort to make IJAM a leading journal in its subject area.

Mike Ciavarella's picture

a couple of recently published papers in contact mechanics -- roughness and dynamic rolling

For those interested in a classical subject like contact mechanics, here are a couple of recent papers published in August.  One is an extension of the Greenwood Williamson theory of rough contact, and the other is a linear perturbation solution of the classical Carter rolling contact problem for a rolling cylinder, when the surface is corrugated and hence there are oscillations in both normal and tangential loads.

Modal Analysis Ansys Workbench

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Hi,

attaching a data sheet to abaqua

hi, can someone please guide me how i can connect a data sheet in excel to a abaqus job or can i put the results from a stress-strain test to abaqus programm.

 

cheers

shyam 

Asymptotics for 1d string/beam immersed into a 2d/3d media

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Dear iMechanicians,

Could someone suggest me the references regarding the following topics:

Consider  a 2d or 3d elastic body with an immersed 1d inclusion.

I am looking  for asymptotics at the inclusion's tips for the following cases:

1. Inclusion is an absolutely rigid beam or string.

2. Inclusion is an elastic string (i.e., there is no bending stiffness).

3. Inclusion is an elatic beam. 

 

Many thanks in advance,

Evgeny Savenkov 

Vikram Gavini's picture

Brief overview of electronic structure calculations

I am attaching a brief overview of electronic structure theories (ab-initio theories) with emphasis on the various approximations that form a basis for these theories. It also contains references that provide a comprehensive introduction to the field.

An ethnobotanist in the mechanical wilderness

Hi, I am just making an entry here to introduce myself.

 I am an ethnobotanist studying the origin, domestication, and dispersal of taro, a semiaquatic herb (in nature). My role is historian to the crop, so I try to learn anything and everything I can about the plant, from all points of view.

Watching seeds germinate

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Hi,

I have been watching some small seeds germinate on different media.

The root pops out first, from a split in one end of the seed, navigates down to the substrate, then inserts itself into the substrate if it can (e.g. when placed on sand or soil). Otherwise it grows along the surface horizontally (on filter paper). The vertical growing plant also puts out a horizontal set of very fine root hairs, at the ground surface, and then stands up, lifting the seed into the air with the first leaves still stuck inside the seed.

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