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Abaqus - uniformly meshing a sphere

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Hi,

I have a small problem in generating a mesh for a sphere in abaqus.

I
am able to create a sphere using a 3D shell geometry, but I am unable
to uniformly mesh it. All I can see is an irregular mesh with
quadrilateral elements. I wanted to use hexahedral elements for the
sphere with uniform meshing and I tried using 'create bottom - up
mesh', but of no use.

Sorry guys, I know I've done it a long time ago. Can't figure it out now. Please help.

Thanx.

substructuring and submodelling

can someone give me applications of substructuring and submodelling and some releted project topic on that

fracture mechanics of concrete

how we may create a notch in a beam and how we may obtain the load- deformation curve by abacus 6.6.3 version plz anyone can give me step by step procedeure plzzzzzzzzzzzz 

Finite element programming for multiple load steps

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Hello Everybody

I am in need of help in including multiple load step options in my c program which is a fem solver for contact(2D).

I do not understand how  to go for second load step after the 1st one.

Its not clear for me what all i have to do, one thing i know is updating the nodal locations.

Please help me on this or guide to the place where ir can get help.

 

Thank You

Material Modelling

Hi all,

      I doing modelling on soft clay behaviour which exhibit softening behaviour during constant strain loading. Here i followed a non-associated flow rule for better prediction of dilation . For the case of non-associated flow rule yield function and plastic potential function should not same i clear in that , my doubt is that we can use two different surface for yield and plastic potential function (eg: linear surface as yield surface and elliptical surface as plastic potential )? 

Analytical elastic-plastic solutions for the torsion of a round bar with a heterogeneous cross section

Hello,

I am trying to derive/find an analytical expression
for the torsion of a round bar made of an heterogeneous material. But I just do
not seem to find any solution available in the literature other than for a
homogeneous material, which can be find in any theory of plasticity book (e.g.
Theory of Plasticity, 3rd Ed., J. Chakarabarty, pp. 132-136).

Tunneling

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How to define tunnel volume loss in Abaqus in 2D and 3D?

Zhigang Suo's picture

Freely jointed chain

A single strand of polymer is a chain of a large number of monomers.  The monomers are joined by covalent bonds, and two bonded monomers may rotate relative to each other.  At a finite temperature, the polymer rapidly changes from one configuration to another.  When the two ends of the polymer are pulled by a force, the distance between the two ends changes.  The polymer is known as an entropic spring.

Pile-Soil Interaction in Abaqus

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Hi

I am trying to simulate a laterally loaded pile in Abaqus. However, once the initial stress is generated using the geostatic step, i have no idea on how to replace the soil with the pile.

I request help with the situation.

Seeking for PhD position

Hello I am Prakhar Gupta (Final Year Mechanical engineering, undergraduate). My
area of interests are
Carbon
Nanotubes, Design engineering, Mechanics of Solids
. I am engaged in one of the project for my degree on

Fracture using cohesive elements

Hi everyone , 

I'm Yashaswi Prateek  doing by final year project on fracture in composites using ABAQUS. I'm new to ABAQUS and have been trying to do some tutorials to get a better understanding of the software. After basic tutorials , i've started trying to generate a model using cohesive elements where i got stuck up. I have tried the procedure in Abaqus user manual and is showing some errors regarding interaction properties and creating a step.  It would be great help if someone could help me regarding how to model with cohesive elements.

Jizhou Song's picture

Report from NBC Learn on Epidermal Electronics

Here is the report from NBC Learn, the education arm of NBC, about Profs. John Rogers and Yonggang Huang's work on epidermal electronics.

http://www.nbclearn.com/portal/site/learn/cuecard/62961

(You can press control+click to open it, or copy the above weblink to a browser) 

Zhigang Suo's picture

Tensors

These notes may serve as a reminder of tensor algebra.  The notes supplement the course on advanced elasticity.  Several books are listed at the end of the notes.

Update on 17 April.  I am now breaking up the notes on tensors, cleaning them up, and posting them as sections on linear algebra.

Zhigang Suo's picture

Elasticity of rubber-like materials

In the notes on the general theory of finite deformation, we have left the free energy function unspecified. The notes here describe free energy function commonly used to describe the elasticity of rubber-like materials.  These notes are part of a course on advanced elasticity

Abaqus cohesive elements/cohesive surface

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For my
graduation project I’m working on a model to describe cracking behavior. For
this model I want to model a fibre-epoxy interface, see the attached figure 1
(due to symmetry only a quarter is modeled). The fibre part is modeled with
lineair elastic material. The epoxy part is modeled with CPS4 elements, with
elastic behavior and MAXPS damage (damaged evolution included). The connection
between the fibre and epoxy interface can be modeled with both a cohesive
surface and cohesive elements.  However

Cohesive elements wont break

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Hi!

My name is Christian and Im having big problems whit geting my cohesive elements to break. I have been stuck for some time now and cant find the right help. Im not experienced whit abaqus so its probably a very simple fault but I cant find it.

 I have a model of 3 elements in 3D. Steel on the top and bottom and glue in the middle. I pull in the upper steel element but the glue wont break no matter how far I pull the top element. Im very insecure about my input numbers for the glue but I have tried a lot of diffrent combinations but I cant find any that works.

Royalty Free Illustrations

Does anyone know of a good source for free science and engineering illustrations? I'm particularly interested in crystallography, crystal defects/dislocations, and mechanical properties illustrations.

Thanks 

Zhigang Suo's picture

Elastocapillarity

These notes are part of a course on advanced elasticity.  The notes recall several phenomena where both elasticity and surface energy are significant, including

  • Griffith crack
  • Adhesion of flexible structures
  • Wafer bonding
  • Contraction of a soft elastic sheet 

The notes also contain a formulation of combined surface energy and elasticity of finite deformation.  

Jing_Yang's picture

Would you like to recommend some ebooks on computational nonlinearity?

Hi, everyone:

    I'm recently very interested in computational nolinearity. Would you like recommend some monographs on the computation nonlinearity so that i can have a better understanding of the mechanism of ABAQUS.

    Thanks

  

Jing_Yang's picture

An example employing smeared crack model in ABAQUS documentation cannot converge?

 Dear all:
    I recently find an example in ABAQUS documentation cannont convergence.
    The parametres related with the iteration of the Risk method is 

arc length  initial increment    minmum increment  maximum increment  maximum number 
 1                0.0001                1E-10              1E+36       100000
    The location of the exmaple in ABAQUS documentation is Abaqus Example Problems Manual->1 Static Stress/Displacement Analyses->1.1 Static and quasi-static stress analyses-> 1.1.5Collapse of a concrete slab

Should a continuum be an open subset?

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I recent read the book of Prof. J. Tinsley Oden "A short course on nonlinear continuum mechanics"

http://users.ices.utexas.edu/~arbogast/cam397/oden0908.pdf

which declares that reference configuration is an open, bounded, connected subset of R3 with a smooth boundary (in Page 1).

It is strange to me beacause that means we cannot consider the boundary of the deformable bodies in its following discussion.

Should continuum be an open subset?

I recent read the book of Prof. J. Tinsley Oden "A short course on nonlinear continuum mechanics"

 http://users.ices.utexas.edu/~arbogast/cam397/oden0908.pdf

 which declares that reference configuration is an open, bounded, connected subset  of R3 with a smooth boundary (in Page 1).

It is strange to me beacause that means we cannot consider the boundary of the deformable bodies in its following discussion.

does anybody have the abaqus seminar pdf ''modelling heat transfer and thermal-stress analysis with abaqus'' ???

does anybody have  the abaqus seminar pdf ''modelling heat transfer and thermal-stress analysis with abaqus'' ???

 perhaps an older version...i d like learn it, hope u guys can help me, thank u very much.

if u have the pdf file, please give a freelink with dropbox or sth alke, or send me direct to zsc13810288137@hotmail.comLaughing

failure analysis of composite material

hi i am new to abaqus software.  i am doing research on failure analysis of composite material.  i want to model the workpiece and machine by a tool.  any one can please help me if you have any tutorial to model this explicit analysis.  i want to analyse the chip also.

please send the help link to stkrajan@gmail.com

thankyou

with regards

kasirajan

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