• WXing
  • New member
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  • Registered: 18-10-2016
  • Posts: 6

Topic: What is the local coordinate system for 2D interface elements ?

Hi Guys
I wanna confirm how the oofem sets local coordinate system for stiffness matrix integration? I can not understand the lines of code in the function scope, IntElLine1 :: computeCovarBaseVectorAt(IntegrationPoint *ip, FloatArray &G) in interlline1.C.
Can anyone give me an explanation or reference?
Regards

Xing

  • From: Gothenburg
  • Registered: 25-06-2013
  • Posts: 26

Re: What is the local coordinate system for 2D interface elements ?

Hi,

In IntElLine1, the local coordinate system is given by a single local coordinate along the interface. The local coordinate xi ranges from -1 to 1 within the element.
IntElLine1 has 4 nodes: 2 located at xi = -1 and 2 located at xi = 1.

Regards,
Erik