Finite Element 1

Question 1

The three steps of FEA

Answer 1

1. Preprocessing Phase (create and discretize into finite elements)
2. Soluton phase
3. Postprosessing phase

Question 2

Errors in FEA

Answer 2

Modelling error
- idealization errors caused by modification of the CAD model

Discretization error

Numerical error
- accumulation of round-off errors

Question 3

Fundamental concepts of FEM

Answer 3

Equilibrium in x direction

Compatibility (between strain and displacement)

Material law (Hook’s law fir uniaxial stress)

Boundary conditions

Question 4

The solution of the strong form satisfies:

Answer 4

Pointwise equilibrium for 0<= x =< L

Essential and natural BC’s exactly