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Continuum damage and failure evolution in inhomogeneous ceramic rods

100%

Najar J. , Silberschmidt V.

1998

tom Vol. 50, nr 1

21-40

A well-posed CDM model and an adequate representation of deterministic and random inhomogeneity factors, combined with an efficient numerical algorithm of modified lattices, yield a realistic simulation of the rupture properties of alumina ceramic specimens at tensile tests. Effects of energy dissipation and acoustic emission, the load-carrying capacity and the post-critical response are analysed in dependence of the heterogeneity realisations, which are related to the initial damage distribution within the specimen. This distribution is shown to be a crucial factor determining the response of brittle damaging ceramics at rupture.

Symulacja drgań belki kompozytowej z cieczą magnetyczną

70%

Lara-Prieto V. , Kęsy Z. , Parkin R. , Jackson M. , Silberschmidt V.

2010

tom R. 83, nr 1/S

255-262

Przedstawiono obliczenia numeryczne wykonane za pomocą programu ANSYS 11.0, dotyczące wpływu natężenia pola magnetycznego na częstotliwość i amplitudę drgań wymuszonych belki kompozytowej z cieczą magnetyczną. Na podstawie wyników obliczeń stwierdzono, że aktywacja cieczy magnetycznej spowodowała 10-krotne zmniejszenie amplitudy drgań, przy której występuje amplituda maksymalna.

In the paper harmonic analysis of a sandwich beam with magnetic fluid (MR) is undertaken with the ANSYS program. The purpose of this analysis is to simulate a MR sandwich beam to obtain its natural frequency and vibration amplitude with and without magnetic field. The beam is made out of the polyethylene terephthalate and the used MR fluid is AL 458, produced by Fraunhofer-ISC. The viscoelastic properties of the fluid, needed for calculations, were obtained with a plate-plate Anton Paar rheometer which has an adapted MR fluid device to generate a uniform and controlled magnetic field up to 1 Tesla in the fluid gap. From these measurements, the complex shear modulus G* was inputted in the ANSYS program to model the fluid as a viscoelastic solid. This parameter was introduced as frequency-dependent properties. For the harmonic analysis, a sinusoidal load of 13N was applied to the beam in the vertical direction. Then, the plot response vs. frequency was obtained. It have been noted that application of magnetic field caused significant influence on amplitude decreasing. In conclusion it was stated that MR fluid can be successfully applied in sandwich beams, but results of numerical calculation should be verified experimentally before practical application.