Finite Element Analysis as a very fine art

[Michael GilliganParticipant @michaelgilligan61133]

[Michael GilliganParticipant @michaelgilligan61133]

This may be of interest to those who remember what FEM/FEA was like in the 1980s

**LINK**

https://www.mdpi.com/2079-4991/10/5/959

… others may be bored to tears, or incredulous, so I am quoting the Abstract

MichaelG.

___________

Abstract:

Diatom frustules, with their hierarchical three-dimensional patterned silica structures at nano to micrometer dimensions, can be a paragon for the design of lightweight structural materials. However, the mechanical properties of frustules, especially the species with pennate symmetry, have not been studied systematically. A novel approach combining in situ micro-indentation and high-resolution X-ray computed tomography (XCT)-based finite element analysis (FEA) at the identical sample is developed and applied to Didymosphenia geminata frustule. Furthermore, scanning electron microscopy and transmission electron microscopy investigations are conducted to obtain detailed information regarding the resolvable structures and the composition. During the in situ micro-indentation studies of Didymosphenia geminata frustule, a mainly elastic deformation behavior with displacement discontinuities/non-linearities is observed. To extract material properties from obtained load-displacement curves in the elastic region, elastic finite element method (FEM) simulations are conducted. Young's modulus is determined as 31.8 GPa. The method described in this paper allows understanding of the mechanical behavior of very complex structures.

[Dave HalfordParticipant @davehalford22513]

I always thought that.

[10ba12baParticipant @10ba12ba]

That's all fine and dandy BUT do you get wafers with it?

H.

[Michael GilliganParticipant @michaelgilligan61133]

Nice one, Dave

But … just to emphasise the ‘fine’ point, I should quote:

The final mesh consisted of 21.6 million tetrahedral elements and 1.2 million hexahedral elements with an average mesh quality of 0.95.

MichaelG.

[Steve Skelton 1Participant @steveskelton1]

Cannot say that I am still up to speed with numerical analysis and FEA but I specialised in FEA FEM in my final year at Univ of Southampton in '82 – as I recall it was a bit of a doddle subject.

Now, where are my old notes!!

Steve

[Michael GilliganParticipant @michaelgilligan61133]

The mesh illustrated here is about as good as I remember it being, when I was was in the vibration test house:

**LINK**

https://www.bksv.com/~/media/literature/Product%20Data/bn0556.ashx

Not quite in the same league as the paper I referenced.

MichaelG.

[Author]

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