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Inaccurate UMAT result in SMP model

Submitted by nibalog on
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ABAQUS
viscoelasticity
UMAT
shape memory polymer
shape fixity

Hello:



I have written a UMAT subroutine similar to the one shown in abaqus 6.11 subroutine manual 1.1.40 with a slight differences indicative of the material's rheological model.

my expanded isotropic model looks like:

sigma_x - sigmav_x/3 + vbar*sigma_dot_x + kappa*sigma_dot_x =

lambda*eplv + 2*mu*epl_x + lamdabar*eplv_dot_x +2*mubar*epl_x



where:

sigma = stress

epl = strain

_dot_ are my rate change with time

sigmav = sigmaxx + sigma_yy + sigma_zz ( hydrostatic stress)

small tube flow

Submitted by themotorman on
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small bore fluid flow
plastic tube

I need to know how to to determine the work needed to push  water through a 20 foot thinwall plastic tube ( Polyethylene) with an inner diameter of 4 mm at a rate of 100, 250 and 500 mL/minute. The tube is level throughout. What pressure will I need? How much energy does this take ? Accuracy not needed just an approx figure will be fine at this time, as we will run testing later. The reason for need this is to select a pump for the job.

Thank you so much .

Abaqus - Job aborts reporting that it can't change the current working directory.

Submitted by Aniruthan on
research
ABAQUS
job
error
job manager
job error
job abort

Hello,


I have an Abaqus 6.12-3 installed on a Windows 8 64-bit system.
Everything works smoothly. I am easily able to take control of the CAE
and model, define loads, steps, sections and jobs. The problem is while
running the jobs. The job aborts splashing an error "Unable to change
the current working directory to
C:\Users\ANIABU~1\AppData\Local\Temp\Ani Abu_I-beam_3876." This happens
with all the jobs. Rarely does the job complete successfully, but I am
unable to understand the underlying procedure. I did not request any

Strength of Short Concrete Columns Confined with CFRP Sheets

Submitted by Anonymous (not verified) on
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Hi everyone,

i'm  working with ABAQUS and a new user. i have modelled CFRP confined concrete columns of different shapes. The results found are satisfactory but as i modelled CFRP as linear elastic material so the load displacement curve goes up and up. how can i provide an end to it?

Cohesive (zero thickness): NODE NUMBERING MIDE NOT BE CORRECT (Abaqus)

Submitted by StevenS on
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Fracture Mechanics Forum
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cohesive zone model
cohesive
node numbering
zero thickness

Hi all,

 

 I'm trying to model a 2D cohesive layer with a zero-thickness in Abaqus (6.11.2)

The shape of the layer is a quarter circle.

 

When modelling this i first create a cohesive layer with a certain thickness.

I then convert the part of this cohesive layer to a orphan mesh, then edit the mesh, such that a zero thickness layer is created.

 

However when i want to submit the job i get the following error message:

Plotting stress vs strain curve in abaqus

Submitted by shafquatcd on
research

Dear All, 

 I am modelling a bridge rubber bearing using hyperelastic material (Rubber) and steel plates in abaqus. i am using mooney-rivlin hyperelastic model for rubber 

After running the analysis . i like to plot the stress vs strain graph for the rubber material only and then compare it with the mooney rivlin model .can anyone tell me how to do it ? 

 I am very new

About constutive relation of elastic membranes

Submitted by souvenir on
research
membrane constitutive relation

Is there some theory to describe the constitutive relation of elastic membranes？There are lots of papers studying membranes mechanics of cells, but I just want to know the mechanics of ordinary membranes which are simplified from theories of plates and shells, can anyone tell me some papers or textbooks studying this?(I've found a brief description on Allan Bower's web page, but that's too brief...)

FEMIRAN professional design & analyses using finite element method

Submitted by eng.femiran on
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FEMIRAN professional design & analyses group using
finite element method

FEMIran

FEMIran
is an engineering group with the sole aim of effective use of engineering
simulation methods such as finite element analysis using Abaqus , Ansys ,
Matlab , …

FEMIran's performance strategy

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