THE MODULUS OF ELASTICITY ESTIMATION BY USING FEA AND A FREQUENCY RESPONSE FUNCTION

In the present paper the determination of the Young's modulus by using a vibration test is under observation. The part made of the material of interest is modelled by using finite elements and a normal mode analysis is performed. The modulus of elasticity used in the material model is an assumed one. A low mode of vibration is selected, a bending mode is preferred. On the part an accelerometer is placed and a force sensor is measuring the excitation; the frequency response function is recorded. The natural frequency value of interest is picked and used as a reference for the finite element normal mode analysis. Successive runs of the model are performed while the Young modulus is tuned in order to get the same natural frequency value resulted from experiment. The process is repeated for different boundary conditions.