If refining the element size, are displacements change or not?
If refining the element size, are displacements change or not?
(OP)
If refining the element size, are displacements change or not? if not, what about the stress gradinet?
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If refining the element size, are displacements change or not?
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RE: If refining the element size, are displacements change or not?
RE: If refining the element size, are displacements change or not?
When element are refined, the size of the element is usually made smaller. When that happens, the element displacement will change; however, the overall displacement will not change significantly; although it might be a bit more accurate depending on the algorithms used in the computation.
The same applies to the stress gradient; assuming you are in the elastic range of the material.
RE: If refining the element size, are displacements change or not?
Changing means refining, in the sense that stable models should exponentially move towards a limit. This is one of the checks for stability, a small change in element size should not yield wild swings in stress nor displacement. What you are doing is akin to adjusting an answer based upon significant digits.
But this should be a question in the FEA forum. You'd probably get better discussions.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: If refining the element size, are displacements change or not?
But i have done experiment by changing the element size, i got much change in stress, negligible change in displacement.
but over thumb rule is stress is directly proportional to strain with E linear. can u clarify this two and concluded to one.
RE: If refining the element size, are displacements change or not?
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: If refining the element size, are displacements change or not?
- geometry of what you are modeling
- what type of elements are you using
- where are the stresses and displacements you are looking at
- etc.
RE: If refining the element size, are displacements change or not?
The reason is that the red bits are important for stress, but don't contribute much to the overall stiffness of the structure (for instance you could remove all fillets from a casting and the stiffness would hardly change, but the stresses would rise enormously).
Cheers
Greg Locock
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RE: If refining the element size, are displacements change or not?
A good start: What program are you using for the FEA?
RE: If refining the element size, are displacements change or not?
In the boring areas of a model all that you accomplish with a super fine mesh is slowing down the analysis.
Conversely, if your mesh is too course in the interesting pasts you risk missing something important.
RE: If refining the element size, are displacements change or not?
RE: If refining the element size, are displacements change or not?