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Flash, thanks a lot. Tomorrow I will dig up Johnson's and Roark's book at the library and have a look at it. As for the second case, a plane strain FEA will suffice to validate the formulae used.

I am trying to analyze the contact stresses in two cases of cylundrical contact: Case 1: two perpendicular cylinders with different radii Case 2: cylinder in a cylindrical socket See also the attached file for explanation. I assume there are analytical solutions for the contacts stress for...

Hello, I would like to scale up a complete 3D model. The problem is that I modeled everything in milimeters. Now, I would like to convert the complete model to meters. Is there a scale up/down option or is there another way to do it? I am using Wildfire 3. Thanks in advance!

Hi, Does anyone have experience with fatigue analysis within Pro/Mechanica. I have analyzed some structure on fatigue. Pro/Mechanica calculates and displays following results: - log life: log of number of oycles to failure. FOr example, Mechanica calculates a minimum value of log life to be 6...

Donnis, If you are a designer with CAD experience but no experience with FEM, then you may use one of the FEM modules provided with the CAD software. Most CAD programs have some simple FE module which allows you to define a simple problem, not only beams and trusses but also 2D and 3D, with...

Hi, You can try the following: MODEL -> MATERIAL -> TYPE and then choose either ORTHOTROPIC or ANISOTROPIC material.

Hi jerzy, I am not able to modify the surfaces of a component from an assembly. When I make the group containing the solid and all its surfaces, curves and points and I explode it, the solid is of course gone but there is no sign of its surfaces, curves and points either. Any idea why? How can...

Creep is time-dependent so you may set it up as a transient analysis with an elasto-visco-plastic material. I have never done creep in Nastran, but you certainly need one of creep models of the form creepstrainrate = f(stress,creep strain, time,temperature) with f = function depending on stress...

jerzy, do you know how to break surfaces of components in an assembly? I am trying to break surfaces on one componenent in to smaller surfaces so I can set the mesh size (mesh size on surface) on these surfaces smaller then elsewhere. I want this because one part of the surface to be broken is...

Jerzy, I will try tonight what you just decribed. My post about hiding componenets can be found at: http://www.eng-tips.com/viewthread.cfm?qid=213676&page=1 But you might have answerred my question alreaady. I will try out tonight. I agree too that the number of elaborated examples found in...

jerzy, you can find my other post about hiding components in the Nastran forum. Regards, brkica

Hi jerzy, Do you know how to hide components within FEMAP? (see my other post) Regards.

For some reason I am not able to upload the step file. Here is an attepted with the step file zipped.http://files.engineering.com/getfile.aspx?folder=46056f31-5bb6-4df1-8244-afffd6c31c49&file=3dbeam.rar

STEP file

Here is the .step file

Jagon, Here is the .step and .mod of beam. The geometry was created in Pro/Engineer (units: mm-N-s). Using these units, you can verify that the mass is in tonne, but is not important as it is static analysis in this case. Geometry beam: L x W x H = 150 x 10 x 10 mm (in Pro/E). When inported...

Jaqon, If you import something which has been created in mm's in CAD, you should indeed in Femap apply length multification factor 25.4 in order to arrive at mm's in Femap. And applying an axial load of 100 N to a beam with cross section 100 mm^2, should indeed give a stress of 1 N/mm^2 = 1...

Hi, How can I break a surface on a solid into multiple smaller surfaces? This is necessary in order to enable surface mapping needed for the Hexmesh. Some solids which I import by a step file (usally form CAD) have outer surfaces which have more than 4 edges and can thus not be mapped as...

Hi, Can some one tell me how to hide one of more components in an assembly in FEMAP. I usually import assemblies from CAD as a .step file. Sometimes it is necessary to hide some componenets (in order enable selection of certain surfaces on other components). Usually this is very...