I just started to use Elmer, and the first thing to do is to solve linear eigenvalue problem of elastic beams. I wish to compare the eigenvalues of thin beam which I obtained by Bernoulli-Euler or Timoshenko beam theories with Elmer. The problem is that if I use define the equation as Elastic Plates and define the beam as plate, with very small width, I obtain correctly the eigenvalues. But if I define the equation by using Linear Elasticity and the beam mesh is 3D, then I have much higher and obviously wrong eigenvalues. Does anyone have an idea why the problem occurs for Linear Elasticity models?