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I agree with the other answers. FE programs have the capability of modelling laminate materials both in terms of 2D and 3D elements (if the out-of-plane stresses are of importance to you). You can just enter the material properties of a lamina in its reference orientation and the sequence of the...

Thank you all for your suggestions. The discussion has been transfered to the Composites Forum (http://www.eng-tips.com/viewthread.cfm?qid=408316). Please let's continue our discussion there. I will delete this post soon.

Also to reply to SWComposites and racookpe1978 suggestions from the old post, the tube is sized according to the bending loads, its flexural properties are good enough to carry that bending moment, but when it comes to interaction with an insert, high out-of-plane shear stresses occur, which can...

Hi respected engineers! I face a design issue in which i would like assistance due to my lack of experience. I want to connect a CFRP tube with metal inserts at each edge (the metal fittings are of smaller diameter than the CFRP tube and length of 33mm into the tube) and the proposed joint is an...

Hi respected engineers! I face a design issue in which i would like assistance due to my lack of experience. I want to connect a CFRP tube with metal inserts at each edge (the metal fittings are of smaller diameter than the CFRP tube) and the proposed joint is an adhesive bonded one. After...

Hello eng-tips friends! Today i realised that i don't know how to run a restart analysis in NX Nastran! The software is updated, so i work on Femap 11.2.2 with NX Nastran. I wanted to run a prestressed frequency response model, so in order to do that i had to run a nonlinear modal analysis with...

Ok thank you jbrackin, i see. Could you also give out some hints, how this procedure of restarting in modal analysis from the converged nonlinear stiffness matrix could be implemented? I 'll try first your suggestions, but in case i need it...

Hi and thanks for the reply, I have a truss structure that i want to press down (a heavy weight applied on it) and i want to calculate these preloaded natural frequencies. Now, i have already run preloaded modal analysis using STATSUB with both a temperature load and DEFORM card on beams that i...

Hi everyone, I use Femap v.11.1.2 with NX Nastran 9.0 and i face a rather difficult problem. First of all i have a structure that i want to use in a frequency response analysis, but before that i run a modal analysis so that i can use these results for restart in frequency response...

Hi everyone, I am using Femap 11.1.2 and i wanted to use the SDAMPING card referencing TABLEDi in a direct frequency analysis (S108) in order to express the damping of a viscoelastic layer as a function of frequency. This procedure is explained in Nastran Advanced Dynamic Analysis Manual in...

OK I was just trying to correlate the results from these two different approaches...I input some other 3D orthotropic properties that i found from literature and the results are pretty close. Thanks nlgyro.

I have 4 rows of solid elements through the thickness (thickness=20 mm). The other dimensions for the panel are 283 and 581 mm respectively.

Hi there! I am using Femap v.11.1.2 with NX Nastran 9.0 and i am currently working on modelling a honeycomb panel consisting of aluminum core and Carbon Epoxy laminate faces. I have decided to proceed with modelling the faces qith QUAD4 elements along with PCOMP entry (laminates) and solid...

Quite illuminating! Thank you very much, you have been very helpful also many times in the past with your posts.

Hi everyone, i use Femap 11.1 with NX Nastran v9.0. My basic license includes Steady state Heat Transfer and i would like to use it to perform a radiation analysis with sun as a source to a truss in orbit (although i analyse the structure being at a specific point). Is there a capability of the...

Hi everyone, I have a truss structure connected with two large masses (large compared to the truss), one at each side and i want to rotate the whole structure 60 degrees from the original position, around the CoG. My input is a profile of constant acceleration for 300 sec, then constant...

Hi, let me start over. I have a model in which i want to insert a *DEFORM card for certain elements. These values for the DEFORM card may vary from -0.1 to 0.1 for each element. So eventually i want to have let's say 100 different analysis cases and in each one of these, each element has a...

I correct my words: ...that creates and solves many analysis cases in one run

Is there a way to write a script in Femap API that creates and solves many load cases in one run? More like a parametric analysis of different analysis cases with a varying property of the model.

Hello i am a new member at this forum and i would like to get some help regarding a question i have. I have a truss structure with cables which i model as rod elements with nonlinear material behavior (high tension stiffness and very low compression stiffness). I would like to have a boundary...