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Dear All, I am trying tp simulate a rubber tube inside an inside a steel pipe. the rubber tube has been defined using S4R elements and the steel pipe has been defined using analytical rigid surface. However , i am gettng overclosure error for the contact defination. here is what all I tried...

Dear All , I want to a make an axi symmetric model. ( No not an tyre) (I want to model thw dust cover that we have on suspensions) FOr this I am thinking of using axisymmetric elements such as CGAX4R. Now I will have unaxial loading later. So I would like to have your advice if I should go...

your question is not very clear. Cazn you please explain in detail.

Dear All , I want to a make an axi symmetric model. ( No not an tyre) (I want to model thw dust cover that we have on suspensions) FOr this I am thinking of using axisymmetric elements such as CGAX4R. Now I will have unaxial loading later. So I would like to have your advice if I should go...

maybe you start with a even smaller time increment and have decrease the minimum increment say 1e-10, 1.0, 1.00E-20, , or 1e-20, 1.0, 1.00e-25, , it worked once for me with a very small loading size.

Dear All, Can somebody please tell me what is the equivalent of BSET1 (Nastran) in Abaqus ? Thank you in advance. best regards Kamran shahid

Dear Blas, Thank you for answering my question. SO if my understanding is correct then considering residual vectors means cosidering static flexiblity. Can you please explain what is meant by truncated modes and static flexiblity ? Also if I use NxNastran versions before 9.0 (ie Version...

Dear All, I would like to perform Craign Bampton reduction using Abaqus. Can anybody provide any leads on this? Thank you in advance...!! best regards Kammieorama

thread825-341144 can someone please answer this. even i have the same doubt what is the difference between mode shapes before and after augmentation of residual vectors? and most importantly what do we mean by residual vectors..? thank you in advance..!! best regards Kammieorama

Dear All, I would like to perform [highlight green]Craign Bampton reduction using Abaqus.[/highlight] Can anybody provide any leads on this? Thank you in advance...!! best regards Kamran

I am trying to run a SOL103 in NxNastran v 8.1. In my model there is are Surface cards (BSURFS) I have just mentioned BSURFS. Now SOL103 is running error free but the parts on which i defined surfaces are not acting like surfaces. I mean in the modal shapes i see them bend independent of...

Dear Mr Blas, Thank you very much for your help. I was reading the NxNastran Manual. I was unable to understand the difference between [highlight ]Direct Complex Eigen Values(SOL107)[/highlight], [highlight #E9B96E]Direct Frequency Response (SOL108[/highlight]), [highlight #8AE234]direct...

Dear Blas, If its not too much for you then can you please do me a favour. Can you please suggest which SOL will be best for obtaining both the natural modes and stress values with a rotating force. I I tried reading the NASTRAN manual but i was unable to decide the best one. thanks a lot...

Dear Blas, I would like to repeat if i understood clearly. Kindly correct me if i am wrong. 1. Applying Rotating force (RFORCE) will not cause any change in the natural modes of the crankshaft. 2. When we run SOL103 no stresses will be calculated. (Since I will use the op2 generated for...

Dear Mr Blas, Thank you for the response. I checked your blog just now, but unfortunately the posts are in a different language. however your reply here was very helpful. My doubts are still not cleared. :( I am simulating a crankshaft to which I want to propose some desigbn changes. To...

Dear Blas, Also kindly explain as to what you mean by "Your stiffness matrix is singular because [highlight blue]you have a rigid mody motion[/highlight]"

Dear Blas, i have run the modal SOL103 analysis. Is there anything specific that i should see in it? In this model which i am simulating, I am also applying an force. So , i wanted to see the stresses developed. [highlight #FCE94F]is there a way that we can see stresses in result from a...

I am running a SOL101 analysis and here is an error which I am getting GRID POINT ID DEGREE OF FREEDOM MATRIX/FACTOR DIAGONAL RATIO MATRIX DIAGONAL...

Dear All, Is am running an SOL103 and have requested STRESS(PLOT)=ALL. When i view this in Hyperviews it shows failed to attch result. A friend said that SOL103 does not support stress output. My questions are. 1 Does SOL103 not supposrt stress output only but calculates stresses? (I...

Dear All, I am trying to convert a few abaqus files having contacts to Nastran files. I am using medina for this conversion. The contacts are coming as BSURFS element. Now i have a few questions. 1. Is this the right conversion ? is contacts and BSURFS are they equivalent 2. what is the...