This work focuses on the quasi-static behavior study for simply supported sandwich beams with aluminum faces and magnetorheological elastomer core subjected to three points bending subjected to a magneto-mechanical loading by numerical and experimental investigations. The mechanical properties of the magnetorheological elastomer core are measured experimentally and the mechanical behavior of the MRE was identified by the generalized Maxwell rheological model. Depending upon the adjustable properties of the beam, energy dissipation is by core shear. A systematic series of experiments and finite elements simulations have been performed in order to assess the static behavior of the beam. The results obtained show a significant influence of the magnetic field intensity on the flexural displacement of the beam.
This paper deals with a new method to identify the thermal diffusivity of isotropic materials. Contrary to the flash method, a continuous and constant heating is applied on the rear surface of the sample. An analytical solution of the 1-D transient equation is developed based on Green's function and gives the temperature profile on the opposite surface at the first moments. Regarding the 2 nde derivative of this equation, we found that it reaches a maximum value at a characteristic time tc 2nde which is proportional to the thermal diffusivity α and the sample thickness es. Experiments are performed on a well-known material, ARMCO Iron, to check the feasibility and the accuracy of the identification with noisy temperature measurements. The method is also applied to insulation materials. Uncertainties on the identified values are discussed and rules are given to
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