I developed a three dimensional beam model on Fortran with which I was hoping to obtain the displacements on the free edge of a model fixed on one end and free on the other (it suffers a perpendicular uniform load). However, as I increase the number of elements of the beam, the solution diverges from the theoretical solution and from the one obtained on Ansys for the same type of element. I don't think shear deformation could be a problem as I'm considering it on the stiffness matrix so what could be a possible explanation for this matter?
In finite element theory, the beam has an exact formulation, therefore the solution does not depend on the mesh density.
You have to keep the boundary condation with your size or length
Dear Diogo,
In ANSYS or any other simulation tool you have certain threshold limit with respect to accuracy beyond which whatever might be the reduction in element size or order of the element the values will be unaltered. The reason as its the optimal size for element and beyond or below it might fail to give the maximum confidence level. Hope I have answered your query..
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