PolymerFEM - Constitutive Models - Blogs http://polymerfem.com/blog.php The latest news about constitutive modeling and simulation of polymers. en Fri, 18 May 2012 03:12:49 GMT vBulletin 60 http://polymerfem.com/images/misc/rss.jpg PolymerFEM - Constitutive Models - Blogs http://polymerfem.com/blog.php ANSYS applied dynamic stress analysis http://polymerfem.com/entry.php?112-ANSYS-applied-dynamic-stress-analysis Wed, 03 Aug 2011 18:35:14 GMT Hi, I was trying to get a code to work where I apply a pressure and plot this pressure over time. However, when I go to TimeHist Postpro to plot... Hi,
I was trying to get a code to work where I apply a pressure and plot this pressure over time. However, when I go to TimeHist Postpro to plot the stress over time, the stress doesn't match the pressure...it more or less matches the time. Can someone give me some advice of what to do to fix this? Thanks ]]> mzintegral http://polymerfem.com/entry.php?112-ANSYS-applied-dynamic-stress-analysis Need a simple UMESHMOTION subroutine example. http://polymerfem.com/entry.php?63-Need-a-simple-UMESHMOTION-subroutine-example Fri, 24 Jun 2011 21:37:11 GMT *Hi all, I need a simple UMESHMOTION example through which I can understand this code. The ABAQUS example is too complicated. If someone has a... Hi all,

I need a simple UMESHMOTION example through which I can understand this code.
The ABAQUS example is too complicated.

If someone has a UMESHMOTION code for simple problem, that would be enough for me.
Thanks all,

Mazi ]]> mzram_22 http://polymerfem.com/entry.php?63-Need-a-simple-UMESHMOTION-subroutine-example modeling channel extrusion http://polymerfem.com/entry.php?62-modeling-channel-extrusion Thu, 02 Jun 2011 17:36:06 GMT pls can some one help me i want to model equal chanel extrusion at angle ninety degree but it keep giving me inadmissible contact orientaion. am... pls can some one help me i want to model equal chanel extrusion at angle ninety degree but it keep giving me inadmissible contact orientaion. am using adina ]]> tomide http://polymerfem.com/entry.php?62-modeling-channel-extrusion Interaction properties in CEL http://polymerfem.com/entry.php?61-Interaction-properties-in-CEL Fri, 27 May 2011 11:49:05 GMT Hi! Hope doing well. I am in trouble with interaction properties in CEL? I noticed that whatever my shear stress and frictional co-efficient... Hi!

Hope doing well.

I am in trouble with interaction properties in CEL? I noticed that whatever my shear stress and frictional co-efficient value is, model always take it as zero i.e. frictionless property. I did this using tangential behaviour and penalty.

But I have to model it using shear stress value.

Please advice.

Thank you.

Sincerely-
sujan dutta. ]]> sujan http://polymerfem.com/entry.php?61-Interaction-properties-in-CEL pls help to define CoordMP in explicit http://polymerfem.com/entry.php?60-pls-help-to-define-CoordMP-in-explicit Fri, 20 May 2011 13:54:44 GMT Dear all, Pls be informed that I am using abaqus explicit to model my pipeline that embedded in soil. In standard, Coord 1 means x co-ordinate,... Dear all,

Pls be informed that I am using abaqus explicit to model my pipeline that
embedded in soil. In standard, Coord 1 means x co-ordinate, coord 2 means Y
co-ordinnate and coord 3 means Z -co-ordinate. But I can not undestand the
meaning of CoordMP(nblock,j) in explicit. I want vertical co-ordinates of some
elements of my model but if I put CoordMP(k,2) it shows always a constant value
for all elements which make no sense.

Can you please explain it(CoordMP)? It will be a great help for me.

Pls suggest.

Thanks a lot.

Brdgs-
Sujan Dutta. ]]> sujan http://polymerfem.com/entry.php?60-pls-help-to-define-CoordMP-in-explicit MOONEY-RIVLIN Materail Constants http://polymerfem.com/entry.php?58-MOONEY-RIVLIN-Materail-Constants Tue, 17 May 2011 06:34:43 GMT Hi, can some explain me how the modulus will be calculated using the LS-dyna A and B constant values for MAT_27. Eg: In the materaila card,... Hi,

can some explain me how the modulus will be calculated using the LS-dyna A and B constant values for MAT_27.

Eg: In the materaila card, the inputs are Mass density, poissons ration, constant A and constant B ]]> dhpuneeth http://polymerfem.com/entry.php?58-MOONEY-RIVLIN-Materail-Constants No creep response from poroelastic model http://polymerfem.com/entry.php?57-No-creep-response-from-poroelastic-model Tue, 10 May 2011 06:42:39 GMT ---Quote (Originally by hamid2845)--- Hello, I have modeled intervertebral disk (axi-symmetric model) with poroelastic properties in abaqus,...
Quote Originally Posted by hamid2845 View Post
Hello,
I have modeled intervertebral disk (axi-symmetric model) with poroelastic properties in abaqus,
elastic properties is entered in cae and permeability, initial void ratio are included in inp file,
my analysis converge there is no creep response in my model?
i don't know what is the problem but i think i should define a condition that allows the fluid within the model transfer from one segment to another,
Does anyone know how can i define this condition??
Thanks
]]> hamid2845 http://polymerfem.com/entry.php?57-No-creep-response-from-poroelastic-model How to apply periodic boundary conditions for an unit cell http://polymerfem.com/entry.php?56-How-to-apply-periodic-boundary-conditions-for-an-unit-cell Mon, 02 May 2011 23:58:30 GMT Hello all, I am pretty new to abaqus and i am trying to do simulate fiber pull out test that is embedded in a matrix. I have simulated one unit... Hello all,
I am pretty new to abaqus and i am trying to do simulate fiber pull out test that is embedded in a matrix. I have simulated one unit cell that represents the whole structure and now i want to apply perioid boundary conditions that represents that whole material. I have seen previous post on this kind of problem but i was not able to sove the problem. By the way i work with GUI so i dont know any coding.
I would appreciate any kind of help on this and i am ready to provide more detail explanation if necessary.
Thank you
Anil ]]> Anil Karumuri http://polymerfem.com/entry.php?56-How-to-apply-periodic-boundary-conditions-for-an-unit-cell Apply cyclic loading to cohesive element in Abaqus V.6.10-1 http://polymerfem.com/entry.php?42-Apply-cyclic-loading-to-cohesive-element-in-Abaqus-V-6-10-1 Sat, 16 Apr 2011 14:05:21 GMT Hi all, Is Abaqus cohesive element can response to cyclic loading and model crack growth? Hi all,
Is Abaqus cohesive element can response to cyclic loading and model crack growth? ]]> mmalekan http://polymerfem.com/entry.php?42-Apply-cyclic-loading-to-cohesive-element-in-Abaqus-V-6-10-1 using cohesive element for crack growth modeling in cylinder (Abaqus, V 6.10-1) http://polymerfem.com/entry.php?41-using-cohesive-element-for-crack-growth-modeling-in-cylinder-(Abaqus-V-6-10-1) Sat, 16 Apr 2011 13:43:39 GMT Hi all, I want to model crack growth in a cylinder by using cohesive element in Abaqus. But I do not know how to apply the cohesive element to... Hi all,
I want to model crack growth in a cylinder by using cohesive element in Abaqus. But I do not know how to apply the cohesive element to model. Applying cohesive element in the case that the object model is in cartesian coordinates is straightforward, but I don't know how to apply it in the cylinder.
Please help me.
Thanks. ]]> mmalekan http://polymerfem.com/entry.php?41-using-cohesive-element-for-crack-growth-modeling-in-cylinder-(Abaqus-V-6-10-1) PET Properties in Abaqus 6.9 http://polymerfem.com/entry.php?40-PET-Properties-in-Abaqus-6-9 Wed, 06 Apr 2011 10:25:20 GMT Dear all , I am simulating cohesive zone delamination between steel and PET , PVC polymers.. Is there any standard material... Dear all ,

I am simulating cohesive zone delamination between steel and PET , PVC polymers..

Is there any standard material type available for PET and PVC in abaqus version 6.9

Please recommend me a standard material type available in abaqus which i can use for PET and PVC..

I am running out of my thesis submission days.. Please clarify this doubt.. I need to simulate urgently..

This would be a life saving help

Sincerely ,
Manivannan ]]> manivannan http://polymerfem.com/entry.php?40-PET-Properties-in-Abaqus-6-9 cohesive simulation in abaqus http://polymerfem.com/entry.php?37-cohesive-simulation-in-abaqus Mon, 28 Mar 2011 02:30:29 GMT Hi all , I am simulating Cohesive zone simulation of polymer coated steel using abaqus 6.9 ( Room Temp ). The thickness of steel plate is... Hi all ,

I am simulating Cohesive zone simulation of polymer coated steel using abaqus 6.9 ( Room Temp ). The thickness of steel plate is 0.8mm ( 800 Micrometre). Thickness of PET ( Poly Polyethylene terephthalate ) is 0.03 mm ( 30 micrometre ). Cohesive zone is defined in between these two materials with zero thickness. I use standard traction seperation method embedded in abaqus 6.9. I have the following questions

(a) Regarding material properties,

1. I have given steel properties with elastic-plastic material type

2. Which material type I should use for PET ( Poly Polyethylene terephthalate ). presently I am assigning PET material properties like steel ( Since it is thermo plastic and my research is at room temp ). Is that the right way.? Is any other standard material type available in abaqus. Please clarify. No standard article is available regarding this

(b) Regarding simulation,

1. To create cohesive zone , should we create composite of steel and polymer first then we need to assign cohesive zone ? or can we create cohesive zone modeling directly without creating composite ?

1. I created a orphan mesh in steel surface which faces PET and defined cohesive elements with that. I havent given any constraints between steel and PET. Which type of constraints should I give? In my case , the stell is base . Over that , polymer layer is fixed. In between this two material , cohesive zone has been assigned.

Please clarify these questions. I am striving hard to simulate this.

Sincerely ,

Manivannan ]]> manivannan http://polymerfem.com/entry.php?37-cohesive-simulation-in-abaqus Material parameter http://polymerfem.com/entry.php?36-Material-parameter Thu, 24 Mar 2011 15:51:21 GMT Hi,

I've been simulating iron powder compaction but i always had problems with the material parameters.

1) The density i put should be the solid density or the initial density of the powder before compaction?

2) How about the young modulus? Is it the same as density?

2) Can i know what is Abs Plastic Strain? Is it the same as normal strain?

3) Is it possible for me to compact the powder just by using displacement instead of applying pressure on it?

I really hope someone can answer this for me. I need it urgently.
TQ ]]> yapdao http://polymerfem.com/entry.php?36-Material-parameter Modelling Iron powder compaction using ABAQUS http://polymerfem.com/entry.php?35-Modelling-Iron-powder-compaction-using-ABAQUS Sun, 20 Mar 2011 17:14:59 GMT Dear all, I am currently undergoing a research on simulating iron powder compaction using ABAQUS. As i am new to this software, i need some guide... Dear all,

I am currently undergoing a research on simulating iron powder compaction using ABAQUS. As i am new to this software, i need some guide on it. I had read through the manual but it doesnt help much. Below are my few enquiries:

1) The density required in material parameter is the initial density or the bulk density of the iron powder? If i use relative density, can i input in ABAQUS and how do i do that?

2) I am using Druker Prager to model my simulation. The result obtain is in Mises stress. However, my supervisor said it suppose to be in Drucker Prager values. Can anyone clarify this?

If anyone has a related article on this subject, can you share with me?

Thank you so much,

Yap ]]> yapdao http://polymerfem.com/entry.php?35-Modelling-Iron-powder-compaction-using-ABAQUS gap elements http://polymerfem.com/entry.php?31-gap-elements Sun, 23 Jan 2011 18:28:37 GMT hey guys... i am creating a model for circular concrete filled tubular members in abaqus 6.9...it consists of a steel tube encasing concrete...i am... hey guys... i am creating a model for circular concrete filled tubular members in abaqus 6.9...it consists of a steel tube encasing concrete...i am getting the correct deformed shape in axial compression , but the load-deflection curve is not matching at all...from the literature i have come across the fact that maybe using gap elements for interface between steel and concrete will solve this problem...however i have not got any definite idea of how to define gap elements from the analysis user's manual too...pls help if anybody knows how to define gap elements in abaqus cae or the input file...
thanks in advance :) ]]> singh123 http://polymerfem.com/entry.php?31-gap-elements