Role of temperatures and fiber orientations on transverse shear damping of polypropylene honeycomb sandwich structures

Abstract

This paper reports the effect of temperatures (30 C to 80 C, with incremental steps of 5 C) and orientations of the glass fibers (0 , 30 , 45 , 60 and 90 ) on the dynamic properties (the loss factors and the natural frequencies) of polypropylene honeycomb sandwich composites. The impulse technique has been employed to calculate the natural frequency and loss factor of the sandwich specimens under different temperatures. The natural frequency and loss factor values have also been calculated theoretically using Blevins's formulae for natural frequency, and Yim et al.'s transverse shear effect, respectively. The values of damping loss factor and the natural frequency/stiffness are the maximum at 0 fiber orientation in the skins of the sandwich specimen. The loss factor of the same oriented specimen increases sharply with the increase in temperature. The main reasons for the above are the higher in-plane strength of skins and lower transverse shear strength of the honeycomb core. Hence, the 0 fiber oriented sandwich specimen is more desirable than the other fiber oriented specimens at all temperatures. A good agreement is observed between the experimental and theoretical values.

A review on the damping properties of fiber reinforced polymer composites

“…For instance, the increasing twist and crimp is helpful to improve the vibration damping capability of twill 2/2 fabric reinforced composites. The relationship between fiber orientation and damping properties for sandwich specimen has been further investigated [88]. The highest flexural and storage modulus of quasi-isotropic laminate is observed at (0/AE45/90) s stacking sequence and opposite for damping ratio [89].…”

Effect of interfacial properties on the damping performance of steel–polymer sandwich cantilever beam composites

“…Accordingly, theoretical models have been developed that can predict the damping performance of sandwich composites based on the type and structure of the core damping material (Allen, 2006; Ghinet and Atalla, 2011; Kerwin, 1959; Marchetti et al, 2020; Wu and Kumar Natarajan, 2013). Specific damping capacity and Marciniak–Kuczynski models consider the case when an FRP is used as the core damping material; the angle distribution of laminated plies strongly affects damping performance (Nagasankar and Velmurugan, 2014; Nagasankar et al, 2015; Ni et al, 2015). The elastic–viscoelastic correspondence principle can be used to predict the damping properties of steel and polymer sandwich composites (Xu and Li, 2016), and linear viscoelastic theory has been used to predict damping and mechanical properties (Berthelot et al, 2008).…”