Update 22.06.20

[thaletob]

Added the missing Matrix calculations with respect to xi and eta. What is meant by the function GetBMaxOrder ? I don't understand what it is...

[epsi1on]

GetBMaxOrder() is used inside integration for determining sampling point

[thaletob]

Yes, but the structure of the contained vector is not clear to me... does it contain the max. degree of each row of B? Or how does it work?

[epsi1on]

it is int[] array, usually, three members. first is max degree of Xi, second and third is for other isoparametric dimensions. for 1D elements, only first member have nonzero value, for 2D, first two elements and for 3D, all elements.

[thaletob]

Thank you, this helped a lot.

[thaletob]

I think I only need to complete the QuadrilaturalElement.cs class now before the Elementtype is ready for testing. Am I right?

[thaletob]

I am asking because it is actually pretty hard to keep an overview over all classes and functions and how they hang together when you have not written the whole code on your own. I am trying to get this Element-Type working properly within the following days. Kind regards.

[epsi1on]

I am asking because it is actually pretty hard to keep an overview over all classes and functions and how they hang together when you have not written the whole code on your own. I am trying to get this Element-Type working properly within the following days. Kind regards. There are two approaches for testing, one is unit testing and other one is integrated testing.

• Unit Test is test for each single part (single method like IElementHelper.GetBMatrix()) and compare result with a reference (like another implementation or another software)
• Integrated test is to test the whole code, in our example a full model with external loads and finally compare nodal displacements with reference application

There is only one thing and that is NotImplementExceptions and we can see if it throws any in action! :)

example of integrated test is in here for triangle element:

BriefFiniteElement.Net/BriefFiniteElementNet.Validation/TriangleElementTester.cs

It compares result of nodal displacement with opensees. i think you better create a class with name QuadrilaturalElementTester.cs which is a copy of this file.

[epsi1on]

I am asking because it is actually pretty hard to keep an overview over all classes and functions and how they hang together when you have not written the whole code on your own. I am trying to get this Element-Type working properly within the following days. Kind regards.

Actually my target was to decouple implementation of different elements, so there is a main element which is a state or data holder object, then other elements like DKQ or Q4 are implemented as IElementHelper and Element.Behavior does define which IElementHelper should be used,..

[thaletob]

Okay. Thank you! After testing the code and debugging it yesterday I can understand the structure of your code now. :)