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Hi I would like to print out the stiffness matrix of my model to be used in another application. I have been trying to use the command EXTSEOUT, but I didn't get it. Do someone have any advise how to do that? thanks regards ingroma PS: I use as software NX Natran and Femap to postprocess

Hi I have to evaluate by means of hand calculations the interlaminar shear strength and strain. I have been thinking of using the ply x and y components of stress, but I am not confident that is the right procedure. Do you have any advise or literature or paper ? thanks Regards Ingroma

Hi I have to select an adhesive for skin to honeycomb bonding. I have been thinking of comparing the lamina FEA stess results with adhesive mechanical properties. I wonder if that is the right way to go ahead. Do you know whether there is a standard calculation procedure to predict the stress...

Hi everybody someone can explain me the hart smith 10% rule? I have to do a preliminary sizing and weight extimation of a composite fabric. I have been looking the paper: L. J. Hart-Smith, “The Ten-Percent Rule for Preliminary Sizing of Fibrous Composite but I haven't found where I can...

Hi all Actually I use Femap 9.3 and NX Nastran 5 to model composite parts by means of the laminate property. I just begin working on old models of my previous collegue and I notice that he defined the foam like a 2D ortotropic material. The parts are manufactured using carbon fibre. This...

Hi I am using the laminate element to perform some simulations, my query is if I have different thickness due to the layup configurations, does Nastran take into account the change of section between two of more layups? I mean the stress path should change and so the stress level passing...

Hi Actually I am using the following system of units for my FEA simulations. length: in force: lbf Elastic Modulus: psi mass: lbf mass density: lbf/in^3 WTMASS Param: 0.00259 ( why do I have to set up this parameter?) Acceleration (1G): 386.1 in/sec^2 OUTPUT Disp: in Force: lbf Stress: psi...

Hi all I have to install some inserts in a sandwich panel (honeycomb+skins or foam+skins). But I dont have any idea how to calculate the undercut for the adhesive or how to calculate the ultimite load that the insert can withstand. is there any particular formula or procedure to follow to...

I am carrying out a free free dynamic check to an assembly model to verify that it acts as a rigid model, honestly I don't have clear how to interpret my output results. I mean the first 6 modes have got a frequenty of 1E-4 magnitude or lower, but the shape of the 6 animated models don't recall...

I am going to compare the adhesive stress values got by the part FEA simulations against the adhesive bonded laminate mechanical proprieties test results. The specimens are made with the adhesive and adherents used in the part.

I have got two composite panels joined with metal blocks. These metal blocks are secondary bonded between 4 carbon plies using an adhesive. I would like to get the adhesive stress due to the load. I can get the adhesive proprieties from the certification test we carry out on it. How many details...

Hi I am modelling a part in which I have to bond with an adhesive a metal block withstanding a load. To model the adhesive I figured different options 1) merge the nodes in adhesive areas 2) simulate the adhesive with elements 3) using spring elements between the two adherents 4) to use the...

the pieces are bolted together using fastener or bolts, I am interested in the local analysis because the parts are manufactured using composites. thanks

Hi all I have to model bolds which connect two parts of an assembly and I am thinking of using rigid elements or modelling the bolts with a beam and rigid elements, therefore I would get rigid joints. I would like to have a semi rigid connection instead of a rigid one. How can I model a semi...