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A new computational method for structural vibrations in the medium-frequency range

Ladeveze P., Arnaud L.

Computer Assisted Mechanics and Engineering Sciences

2000

Vol. 7, No. 2

219-226

In the paper a new approach for the computation of slightly damped elastic structural vibrations over the medium frequency range is proposed. The effective quantities (deformation energy, vibrational intensity, etc...) are evaluated after resolution of a small system of equations that does not in any way result from a fine ``finite element'' discretisation of the structure.

Rheological properties of evolutive materials monitored by an acoustic test

Arnaud L., Thinet S.

Applied Mechanics and Engineering

1999

Vol. 4, no spec.

39-44

The rheological behaviour of setting heterogeneous materials is studied by means of an experimental device. It is based on the propagation of acoustic waves at low frequency (100Hz-1kHz). It enables to follow up material setting, and hardening phases and to quantify by an inverse analysis, the evolution of the complex viscoelastic modulus from the fluid to the solid phase. Different rheological evolutions are presented for various formulations of hydraulic concrete and bituminous mix.