Identification of Dynamic (Young’s and Shear) Moduli of a Structural Adhesive Using Modal Based Direct Model Updating Method

Abstract

In this paper, mechanical characteristics (Young's modulus and shear modulus) of an adhesive are identified using modal based direct model updating method and experimental modal data. The results show that both Young's and shear moduli of adhesive are frequency dependent. Also, it is demonstrated that the thickness and length of the adhesive-line have influence on these properties. All experiments and subsequent identifications are conducted both in bending and shear modes, and it has been shown that the shear modulus of adhesive is more sensitive to length and thickness variations. The repeatability and consistency of method is proved through repeating the process several times and with different adherends.

Mechanical Property and Strain Transferring Mechanism in Optical Fiber Sensors

“…They found that the bond length and the bottom thickness are dominant factors besides side width and top thickness. Jahani & Nobari (2008) demonstrated that both Young's and shear moduli of adhesive are frequency dependent in dynamic testing because adhesive materials show viscoelastic behaviour.…”

Relaxation modulus—complex modulus interconversion for linear viscoelastic materials

“…Thus, frequency-time interconversion methods are valuable and useful tools (Emri and von Bernstorff 2005;Schapery 1999a, 1999b) due to the fact that they can also be applied to overcome the inherent difficulties of relaxation or dynamic characterizations (Kulik et al 2009;Maheri and Adams 2002;Jahani and Nobari 2008), depending on the tested material. The most widely applied methods (Emri and von Bernstorff 2005) for material functions conversion from time to frequency domains are those based on Prony series (Chen 2000), and the opposed conversion can be achieved through the algorithms proposed by Ninomiya and Ferry (1959).…”

“…Nevertheless, the methods proposed by Schwarzl (1970) should be highlighted also since both interconversions can be achieved. More recently, other authors have proposed other methods (Emri and von Bernstorff 2005;Schapery 1999a, 1999b;Kulik et al 2009;Maheri and Adams 2002;Jahani and Nobari 2008;Chen 2000;Ninomiya and Ferry 1959;Fernández et al 2011;Schwarzl 1970;Sorvari and Malinen 2007). Nevertheless, that of Leblanc (2005) should be highlighted, as his work focuses on the employment of the Fourier transform but in order to investigate non-linear viscoelastic materials.…”

“…The advantage of this method is a direct employment of the fast Fourier transform (FFT) algorithm to experimental data, in opposition to other existing methods (Emri and von Bernstorff 2005;Schapery 1999a, 1999b;Kulik et al 2009;Maheri and Adams 2002;Jahani and Nobari 2008;Chen 2000;Ninomiya and Ferry 1959;Fernández et al 2011;Schwarzl 1970;Sorvari and Malinen 2007) based on fitting models or theoretical functions. Concretely, the proposed method is valuable when a Prony series cannot be properly fitted to the experimental data in time or frequency domains.…”

Selecting appropriate dynamic model for elastomeric engine mounts to approximate experimental FRF data of them

“…The first types are tensile tests which are static or low frequency tests. The second types are resonant tests which can predict wide frequency range characteristics of the material [2].…”