New finite element: 3 and 4 node shell element

• The element library is extended by a 3 and 4 node shell element (compare with ANSYS element type Shell181). A reduced integration scheme is used to avoid shear locking
• Transverse shear stresses for the finite shell elements are implemented. This post process method is based on first order shear deformation theory

Finite solid element: New functions

• Mass calculation
• Enhanced strain and stress calculation
  

Other new features:

• Orthotropic material is implemented
• Some bugs are fixed

Example:

A finite element mesh which is generated in FELyX. This mesh is used for an onsert calculation. The nodes are generated with b-splines. A 20 node finite solid element (solid186 in ansys) is used.

New developer:

René Arbter: Excellent skills in LCM simulation and process optimization

New developers:

Gion Andrea Barandun: Excellent skills in LCM simulation and optimization

David Keller: Excellent skills in optimization, graph theory and finite 'cake' elements

Thank them for their help advancing FELyX.

FELyX Compiles with gcc 3.4x / 4.x

• FELyX has been updated to work smoothly with GCC 3.4.X and GCC 4.X compiler series.  This includes the inclusion of MTL version 2.1.2-22 as well as a lot of minor code fixes. 
• Right now the updated version is available via CVS checkout, a new release will follow later on.
  

New Release FELyX 0.4

• Download from Sourceforge or here
• More information

Failure criteria are implemented for the shell elements

• Tsai - Hill: evalTsaiHillCriteria
• Tsai - Wu: evalTsaiWuCriteria
• Hashin: evalHashinCriteria

Maximum failure criteria: EvalMaxFailureCriteria( string, const PtrVector<StructElement*>& Elements ) with the string

• "MaximumStress"
• "Tsai - Hill"
• "Tsai - Wu"
• "Hashin"

The new functions for global and local stress or strain calculation for the integration points are

• In global coordinates: EvalStrainsAtIntPoints, EvalStressesAtIntPoints
• In element coordinats: evalElementDirectionStrains, evalElementDirectionStresses
• In material direction 123: evalMaterialDirectionStrains, evalMaterialDirectionStresses