ACCOUNTING FOR THE FREQUENCY-DEPENDENT DYNAMIC ELASTIC MODULUS OF DURALUMIN IN DEFORMATION PROBLEMS

摘要

The flexural vibrations of D16AT Duralumin specimens have been investigated, showing that the dynamic elastic modulus of D16AT Duralumin is significantly dependent on frequency. It has been found that the dynamic elastic modulus significantly reduces in the frequency range 0-20 Hz, and at high frequencies, it is practically constant. A general method has been developed to determine the modes and frequency of free vibrations of a structure taking into account the dependence of the dynamic elastic modulus of the material on its deformation frequency. Numerical experiments on impulsive loading of an elongated plate have been performed, showing that the frequency dependence of the dynamic elastic modulus of Duralumin should be taken into account in structural analysis.