1 / 9

EXPERIMENTAL MESUREMENTS OF THE DYNAMIC PROPERTIES OF VISCOELASTIC MATERIALS AND SYSTEMS

Imeko Technical Committee 15 2nd Youth Symposium on Experimental Solid Mechanics May , 7-10 2003 Milano Marittima (Ravenna), Italy. EXPERIMENTAL MESUREMENTS OF THE DYNAMIC PROPERTIES OF VISCOELASTIC MATERIALS AND SYSTEMS. Archi.Me.Des. Dipartimento di Ingegneria Meccanica

leyna
Download Presentation

EXPERIMENTAL MESUREMENTS OF THE DYNAMIC PROPERTIES OF VISCOELASTIC MATERIALS AND SYSTEMS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Imeko Technical Committee 15 2nd Youth Symposium on Experimental Solid Mechanics May, 7-10 2003 Milano Marittima (Ravenna), Italy EXPERIMENTAL MESUREMENTS OF THE DYNAMIC PROPERTIES OF VISCOELASTIC MATERIALS AND SYSTEMS Archi.Me.Des. Dipartimento di Ingegneria Meccanica Università degli Studi di Brescia

  2. Rubber-to-metal devices Automotive applications:Vibrations-damping devices • Vibrations-damping device for Mc-Pherson suspensions • Engine mountings • Adaptive journal boxes 2nd Youth Symposium on Experimental Solid Mechanics

  3. Stress Temperature Strain Materials Dynamic properties of elastomers • Visco-elasticity • Non - linearity • Frequency dependence • Temperature dependence • Static pre-strain dependence Hysteresis Self-heating 2nd Youth Symposium on Experimental Solid Mechanics

  4. Experimental analysis Fixtures Electro-dynamic shaker Material properties: Suspended mass Test specimen E* G* Standard test-pieces Device global stiffness: K* Vibrating board Shaker Sweep of sine waves at constant deformation levels Rubber-to-metal devices 2nd Youth Symposium on Experimental Solid Mechanics

  5. Temperature PC & Controller ADC measurement DAC Acceleration Data measurement Drive signal Power drive Shaker Test Design Power Amplifier Output Accelerations System Frequency response Stiffness Measurement chain 2nd Youth Symposium on Experimental Solid Mechanics

  6. Young’s modulus E(w) Stiffness measurement Suspended mass accelerationaOUT System global stiffness k Imposed accelerationaIN Sine waves System global stiffness k(w) System frequency response 2nd Youth Symposium on Experimental Solid Mechanics

  7. Deformation level increase causes: G’ [MPa] Pre-strain level increase causes: Effects of pre-strain, deformation and frequency Results • decrease of E’ • growth of E’’ Effects of the deformation level • growth of E’ 2nd Youth Symposium on Experimental Solid Mechanics

  8. Results show good accordance with the master curves coming from DMTA Effects of temperature, frequency and deformation 2nd Youth Symposium on Experimental Solid Mechanics

  9. Conclusions and discussions • An innovative experimental approach based on the use of an electrodynamic shaker has been proposed to investigate the dynamic properties of viscoelastic systems and materials. • Results obtained are in good accordance with theory and with those coming from traditional methods such as DMTA analysis. • A method to estimate uncertainty related to stiffness measurements have to be defined. 2nd Youth Symposium on Experimental Solid Mechanics

More Related