Which nastran can solve surface-surface contact?
Which nastran can solve surface-surface contact?
(OP)
The question is the same. Additional: Which is the best?
(Speed, accuracy etc.)
Irwin
(Speed, accuracy etc.)
Irwin
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Which nastran can solve surface-surface contact?
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RE: Which nastran can solve surface-surface contact?
RE: Which nastran can solve surface-surface contact?
RE: Which nastran can solve surface-surface contact?
Irwin
RE: Which nastran can solve surface-surface contact?
Contact is generally a manipulation of a Truss element for which you can designate a stress-strain curve. Basically, you define the stress-strain curve in such a way that it has no modulus of elasticity (i.e. a flat stress-strain curve) until you reach a strain nearly equal to the length of the element. Once you shortened the element to a certain length, the stress-strain curve then indicates a large modulus. If you manually create this elements, be careful that you don't change this stress-strain curve too rapidly or the problem may not converge.
Many FE packages have incorporated this "curve truss" element and predefined the stress-strain curve renaming the element a "contact" element. You generally have to be in a non-linear analysis method to use this feature. I know Algor and NENastran have it. I'm also pretty sure that COSMOS can do it. Not sure about MSC Nastran, but do agree that it is in FEMAP.
RE: Which nastran can solve surface-surface contact?
The truss element that is discussed above is simply the gap element in nastran and no stress-strain curve is required. A simple rod or truss element can be set up this way as described but this is not necessary in nastran. For undulating surfaces the setup for gaps is very time consuming requiring a different set of parameters for each element.
Surface contact is the best solution. It is the easiest to set up and with few exceptions will handle most contact scenarios.
RE: Which nastran can solve surface-surface contact?
Garland E. Borowski
Borowski Engineering & Analytical Services, Inc.
RE: Which nastran can solve surface-surface contact?
Surface-to-surface with gap elements is possible but not a good solution. It depends a lot on your typical model.
RE: Which nastran can solve surface-surface contact?
RE: Which nastran can solve surface-surface contact?
RE: Which nastran can solve surface-surface contact?
I still recommend NEiNastran because it is easy to set up and works. Certainly MARC is a capable product as well.
RE: Which nastran can solve surface-surface contact?
Wrong again :-(.
Thomas
RE: Which nastran can solve surface-surface contact?
Irwin
RE: Which nastran can solve surface-surface contact?
Irwin, FEMAP v9 will be released shortly (as I am told) and has a lot of new features and a completely new look and feel. UGS owns FEMAP.