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Differents results from linear to quadratic elements

Question:

Hi,

We are testing solid model with linear VS quadratic elements, if you confront slide 3 and 5 you can see wide difference in the results, why?

Regards

Answer:

You will understand that higher order elements will give results closer to exact results than linear elements. Also, if we make finer mesh with linear elements we will obtain results closer to exact results.

Let me give you my test results which shows above. This test model is simplified from your model.

1. Linear element model: 1457 N/mm2 (Nodal average)

2. High order element (Quadratic): 2162 N/mm2 (Nodal average)

3. Finer mesh with linear element: 2095 N/mm2 (Nodal average)

Regards,
DK Lee
Technical Manager

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quadratic element

Creation date: 6/8/2020 5:40 AM Updated: 6/8/2020 3:12 PM

DataImage11.png

DataImage17.png

DataImage41.png

Linear element model.fea

Finer mesh with linear element model.fea

High order element model.fea

DataImage64.png

Nodo Solido in acciaio.7z

Files		Sort by Name Sort by Date
	DataImage11.png 124 KB
	DataImage17.png 126 KB
	DataImage41.png 156 KB
	Linear element model.fea 3 MB
	Finer mesh with linear element model.fea 3 MB
	High order element model.fea 3 MB
	DataImage64.png 219 KB
	Nodo Solido in acciaio.7z 4 MB