Evaluation of the dynamic properties of PVC foams under flexural vibrations

Abstract The paper presents an investigation of the damping of PVC foams under flexural vibrations of clamped-free beams. The PVC foams are constrained by two aluminium beams and different densities of the PVC foams are studied. An experimental investigation is implemented using an impulse technique. The natural frequencies and the damping of the beams are modelled by using a finite element analysis based on the sandwich theory. Next, the numerical and experimental results are used to derive the shear modulus and the damping of PVC foams as functions of the frequency. Finally, the experimental investigation and the developed modelling show how the damping of aluminium–foam beams must be corrected to estimate the damping of PVC foams.

[1]  T. Pritz,et al.  Transfer function method for investigating the complex modulus of acoustic materials: Spring-like specimen , 1980 .

[2]  Dimitris A. Saravanos,et al.  Analysis of passive damping in thick composite structures , 1993 .

[3]  R. Moreira,et al.  Viscoelastic Damping Technologies-Part I: Modeling and Finite Element Implementation ⋆ , 2010 .

[4]  Eduards Skuķis,et al.  Characterisation of Viscoelastic Layers in Sandwich Panels via an Inverse Technique , 2009 .

[5]  Y. Berthelot,et al.  Determination of the complex Young and shear dynamic moduli of viscoelastic materials. , 2001, The Journal of the Acoustical Society of America.

[6]  Jose Herskovits,et al.  Characterisation by Inverse Techniques of Elastic, Viscoelastic and Piezoelectric Properties of Anisotropic Sandwich Adaptive Structures , 2010 .

[7]  Gilbert F. Lee,et al.  Improved resonance technique for materials characterization , 1983 .

[8]  Rodger N. Capps Dynamic Young’s moduli of some commercially available polyurethanes , 1983 .

[9]  A. Araújo,et al.  A Viscoelastic Sandwich Finite Element Model for the Analysis of Passive, Active and Hybrid Structures , 2010 .

[10]  T. Pritz,et al.  Dynamic Young's Modulus And Loss Factor Of Plastic Foams For Impact Sound Isolation , 1994 .

[11]  Dimitris A. Saravanos,et al.  Integrated Damping Mechanics for Thick Composite Laminates and Plates , 1994 .

[12]  Brown,et al.  Determination of the dynamic elastic moduli and internal friction using thin resonant bars , 2000, The Journal of the Acoustical Society of America.

[13]  D. Norris,et al.  LONGITUDINAL FORCED VIBRATION OF VISCOELASTIC BARS WITH END MASS , 1970 .

[14]  J. Berthelot,et al.  Damping analysis of laminated beams and plates using the Ritz method , 2006 .

[15]  J. Berthelot,et al.  Damping analysis of unidirectional glass and Kevlar fibre composites , 2004 .

[16]  Kshitij Gupta,et al.  Damping studies in fiber-reinforced composites : a review , 1999 .

[17]  D. Norris,et al.  Complex-modulus measurement by longitudinal vibration testing , 1970 .

[18]  J. Berthelot,et al.  Damping Analysis of Orthotropic Composites with Interleaved Viscoelastic Layers: Modeling , 2006 .

[19]  J. Berthelot,et al.  Damping analysis of orthotropic composite materials and laminates , 2008 .

[20]  Roberto Frias,et al.  Viscoelastic Damping Technologies-Part II: Experimental Identification Procedure and Validation , 2010 .

[21]  José Herskovits,et al.  Combined numerical-experimental model for the identification of mechanical properties of laminated structures , 2000 .

[22]  Stephen A. Hambric,et al.  Inferring Viscoelastic Dynamic Material Properties From Finite Element and Experimental Studies of Beams With Constrained Layer Damping , 2007 .

[23]  Dimitris A. Saravanos,et al.  High-order layerwise mechanics and finite element for the damped dynamic characteristics of sandwich composite beams , 2004 .

[24]  J. Berthelot,et al.  Damping Analysis of Sandwich Composite Materials , 2009 .

[25]  P. Cupiał,et al.  Vibration and damping analysis of a three-layered composite plate with a viscoelastic mid-layer , 1995 .