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Recent content by brad
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More on solver speed: ROI of expensive commercial sw?
Automotive N&V and full-vehicle crash guys still put a premium on performance, as their models are often on the order of 2-10 Million dofs (and often thousands of modes in the case of N&V). This is why at the automotive OEM's the niche players have almost no footprint--they can't scale to solve...- brad
- Post #7
- Forum: Finite Element Analysis (FEA) engineering
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Node mass in ABAQUS
*ELEMENT, TYPE=MASS, ELSET= . .. *MASS, ELSET= . . . (for rotational, see *ROTARY INERTIA)- brad
- Post #2
- Forum: Finite Element Analysis (FEA) engineering
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Simple? Statics
ivymike-- The basic assumption that people have started with is that this was an originally-level plate. Something must have caused this plate to become "out-of-level" upon the removal of cable 4. Some net moment must cause this to rotate, then must be reacted by an opposing moment to cause it...- brad
- Post #37
- Forum: Mechanical engineering general discussion
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Simple? Statics
Vonlueke: you state "In other words, the plate will rotate slightly and now be "crooked." But notice, even then, the force in cable 2 is still zero." This illustrates a fundamental error in this line of reasoning. If there is absolutely no force in cable 2, then what causes this rigid plate...- brad
- Post #34
- Forum: Mechanical engineering general discussion
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Abaqus, ANSYS, Algor, Mechanica which is the best?
Re: tying meshes... I know that ABAQUS has the facility to tie disparate meshes together. What it amounts to is a special form of contact, in which the "slave" surface's nodes are tied to the master (thus the displacements are locked to the interpolated displacement of the master surface). Thus...- brad
- Post #7
- Forum: Finite Element Analysis (FEA) engineering
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Simple? Statics
JStephen, YOur post, though sarcastic, is correct. However, most of us can likely agree that many of those assumptions are second-order effects for most use-cases. (Note that if we were talking of an engine, I likely would've cited thermal expansion as a point of concern). Nobody who has taken...- brad
- Post #31
- Forum: Mechanical engineering general discussion
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on rubber dynamic stiffness
Tom, I find it curious that you would so quickly dismiss ABAQUS in this field. While there may be some argument as to which one is best in rubber modeling, most people in the field acknowledge that both of these analysis codes are exceptional for this type of work. (In fact many of the original...- brad
- Post #6
- Forum: Rubber engineering
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Simple? Statics
Why the heck are we talking about cables? These are bolts, folks--each able to react 6 degrees of freedom. 6 dof x 4 bolts = 24 degrees of freedom to solve. Statics = 6 equations. How do you solve 24 unknowns with only 6 equations available? It's not statics! You can simplify all you want...- brad
- Post #24
- Forum: Mechanical engineering general discussion
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Rectangular Square Tubing
If you know the cross-sectional geometry, you can fairly easily calculate moments of inertia. Brad- brad
- Post #5
- Forum: Mechanical engineering general discussion
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Simple? Statics
I don't think there is enough information to definitely determine the answer--it is a statically indeterminate system (thus it's not "pure statics"). The answer is dependent on the stiffness of the piece to which the bolts are attached. If all bolts are attached to an effectively rigid piece...- brad
- Post #15
- Forum: Mechanical engineering general discussion
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Rectangular Square Tubing
Can't you just calculate MOI and use simply supported beam assumptions with a constant pressure load? (or am I missing something) Brad- brad
- Post #2
- Forum: Mechanical engineering general discussion
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MOMENTS OF INERTIA
If you have the MOI about the CG, it's not clear to me what else you need. You need to clarify your question.- brad
- Post #3
- Forum: DASSAULT: ABAQUS FEA Solver
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VERY large displacement - move coord. system
Can you use inertia relief? This sounds like this would be an entirely appropriate assumption for your problem as described. (I don't know whether or not ANSYS has inertia relief, but if it does this would be ideal) Brad- brad
- Post #11
- Forum: Finite Element Analysis (FEA) engineering
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