EXPERIMENTAL MESUREMENTS OF THE DYNAMIC PROPERTIES OF VISCOELASTIC MATERIALS AND SYSTEMS Imeko Technical Committee 15 2nd Youth Symposium on Experimental.

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EXPERIMENTAL MESUREMENTS OF THE DYNAMIC PROPERTIES OF VISCOELASTIC MATERIALS AND SYSTEMS Imeko Technical Committee 15 2nd Youth Symposium on Experimental Solid Mechanics May, Milano Marittima (Ravenna), Italy Andrea Magalini, David Vetturi Dipartimento di Ingegneria Meccanica Università degli Studi di Brescia

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

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

2nd Youth Symposium on Experimental Solid Mechanics 5 Measurement chain Output AccelerationsSystem Frequency responseStiffness Shaker PC &Controller PowerAmplifier ADC Acceleration measurement Temperature measurement Drive signal Power drive Data Test Design DAC

2nd Youth Symposium on Experimental Solid Mechanics 6 Stiffness measurement Suspended mass acceleration a OUT Imposed acceleration a IN Sine waves System global stiffness k System frequency response System global stiffness k( ) Youngs modulus E( )

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

2nd Youth Symposium on Experimental Solid Mechanics 8

9

10 Conclusions and discussions

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