Oberst method

potence oberst

The CEVAA has an Oberst beam for measuring the storage modulus E’ and the material loss factor.

Composition of the equipment: The test means is composed of a magnetic exciter, a non-contact speed sensor and a system allowing the embedding of the specimens.

Dimensions of specimens tested: L x W x Thickness = 250x10x1mm

Oberst method

The impact of materials on the bending vibrations of a beam is studied by the resonance method (Oberst method) according to standard EN ISO 6721-3 [1].

We seek to identify the moduli of elasticity in bending and the average dampings of the materials and to compare them for the second mode of bending of the beam. The identification is carried out by the method at -3 dB from the frequency response functions and the sandwich beam theory (Obert).

Testing conditions

  • The samples are glued to the beam using Loctite 407 glue.

Measurements / calculations made

  • Determination of Young’s modulus and loss factor

Examples of completed projects

  • Innovative materials characterization

Materials characterization benches

petite cabine

Small cabin

cabine alpha

Alpha Cabine

tube d'impédance

Impedance tubes

potence oberst

Oberst method

banc mesure rigidité dynamique

Dynamic stiffness bench

banc essai squeak and rattle acoustique

Squeak & Rattle Test Bench

caractérisation matériaux coefficient de Poisson

Poisson's ratio characterization bench

analyse mécanique dynamique DMA

Dynamic mechanical analysis (DMA)

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