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...
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...
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...
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...
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...
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...
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...
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...
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
This is a classic problem for a nonlinear implicit code. The three dominant nonlinear implicit codes in the US are ABAQUS, ANSYS, and MARC. They are most typically sold on a "subscription" basis, meaning you pay a recurring fee to keep the software. For all three of these, expect to pay over...
This seems like a fairly straightforward nonlinear FEA problem. I have solved many problems very similar to what you are describing. A closed-form solution would be rather difficult.
Do you have FEA software at your company? If not, do you know of any consultants that do FEA? If this is...
I've already cited keyboard "springs" as an example. Try to slowly depress a single key on your keyboard. You will notice that there is a point at which it is very difficult to keep your finger at the same point. This is because there is a load drop-off. This is a designed buckling of the...
john,
You stated:
"And finally whatever theory or method you use, buckling only occurs when the structure can no longer support the applied load and you get catastrophic failure. Up to that point the structure is merely bending or deflecting under load. Thus as Pratt's plates return to their...
