Finite element modeling of the transient response of viscoelastic beams

Jonathan D. Mehl; Ronald N. Miles

doi:10.1117/12.208897

5 May 1995 Finite element modeling of the transient response of viscoelastic beams

Jonathan D. Mehl, Ronald N. Miles

Proceedings Volume 2445, Smart Structures and Materials 1995: Passive Damping; (1995) https://doi.org/10.1117/12.208897
Event: Smart Structures and Materials '95, 1995, San Diego, CA, United States

Abstract

A procedure is presented for computing the transient response of a multiple degree of freedom finite element model of a beam system containing a viscoelastic material. A complex, frequency and temperature dependent shear modulus is used in representing the properties of this material. The beam is struck with an arbitrary transient input pulse, which is transformed to the frequency domain via the fast Fourier transform (FFT) algorithm. The frequency dependent response of the beam may then easily be computed. Applying the inverse fast Fourier transform to this result then yields the transient, damped response of the complete beam system. This `approximate' approach is compared against an exact, modal solution for a system with viscous damping and excellent correlation is observed between the two. Finally, a procedure is presented to incorporate the finite element code ANSYS into the prediction procedure. Through the use of this code, a model constrained layer damped beam may be analyzed to obtain its transient response to an applied load.

Citation Download Citation

Jonathan D. Mehl and Ronald N. Miles "Finite element modeling of the transient response of viscoelastic beams", Proc. SPIE 2445, Smart Structures and Materials 1995: Passive Damping, (5 May 1995); https://doi.org/10.1117/12.208897

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