Im a recently retired engineer with an occasional need to draw stuff. Im on a fixed income (actually not fixed, it's broken, as in no income, just out go) so I need to control my costs. Im looking for a free cad package. Any recommendations?
Rick Fischer
Retired Principal Engineer
Argonne...
Does anyone know of a source for contact permeance coefficients in Henries/m2? I'm trying model magnetic fields in steel plates that are in physical contact with each other. I'm using the old LF emag still in Ansys mechanical, and it supports bonded contact. The contact element has a MAG dof...
Trying to import external data and I get “Error Data in the worksheet is invalid. Please correct before proceeding to import.” The External Data is two files, actually the same file entered twice, and the second is rotated 90 degrees. Either file can be imported correctly separately, the...
Just read the "316L high purity seamless tubing SF" post, and its got me thinking. I'm analyzing something that is already built (yeah, I know, don't say it). Material is dual certified 304/304L. We wanted 304/304L elbows from McMaster-Carr, but when I took the catalog number from the drawing...
I have a strain life plot where the x-axis is labeled "Life (2Nf,reversals)." Never seen this before. What's 2Nf? Twice the number of cycles to failure? Second Normal Form?
Rick Fischer
Principal Engineer
Argonne National Laboratory
Does External Data use *MOPER,,,MAP or does it have its own distinct coding? I have some data that is suspect, and it produces similar results in both. Is that confirmation that the data is hosed, or am I using the same knife to skin the cat?
Rick Fischer
Principal Engineer
Argonne National...
I am performing a seismic analysis on an apparatus per ASCE-4. I am using an equivalent static load per the code and applying it to a full nonlinear finite element model. The model is fully detailed (distributed mass, no stick and lumped mass idealizations, etc). I'm now being told I need to...
Is there a criteria that determines the maximum clearance between a cylindrical surface and a bore that can be tolerated without binding? I have a vague recollection about of an equation with a friction coefficient, but I cant remember the context.
Rick Fischer
Principal Engineer
Argonne...
Does anybody know trhe source of the data for this plot? Is it from a formula or ist it empirical?
Rick Fischer
Principal Engineer
Argonne National Laboratory
I am modeling a pump shaft with Ansys. My Campbell diagram shows a separation between the forward and backward whirl at zero rpm. I did some reading and found that this can happen when the bearing stiffnesses are not axisymmetric, but mine bearings are axisymmetric. What else can cause this?
Does anyone know the derivation of equation 5.6 for the limiting strain shown at 5.3.3.1.c? It looks like a variation on the triaxiality treatments I've seen from time to time. I googled a bit and found a paper by Deng, et al that uses it to evaluate some pressure vessle materials, but they...
Does anybody have any experience with the first item in Table 6.1? I'm having trouble figuring out the definitions for the diameters and how they relate to the part I'm analyzing.
