Abstract
In this paper, the orthotropic damping behavior and mechanism of Nomex honeycomb composites are investigated. The needed specimen sizes for the measurement of the frequency-dependent transverse shear moduli (TSM) and fundamental damping coefficients of the honeycomb cores were analyzed at first. Then, the effects of cell side length and beam orientation on the orthotropic damping properties were explored. The results reveal that relatively high TSM (GLT) and damping values (ηWT) can be obtained by decreasing the cell side length without adding any additional weight. The analytical results of the damping mechanism indicate that the difference in the damping contributions of the interfacial phase to the honeycomb core in different directions leads to the orthotropic damping behavior of the honeycomb core. This study is helpful to guide the TSM measurement and structure design of honeycomb composites.
Highlights
Nomex honeycomb core has been used as a crucial component in weight-sensitive fields such as aerospace and transport packaging, because of its relatively high damping properties, excellent out-of-plane specific stiffness, and low dielectric properties [1,2,3]
Considering that the Nomex honeycomb core consists of a series of polymer materials whose damping properties usually exhibit frequency dependence, the frequency-dependent orthotropic damping properties of honeycomb composites are explored in this paper
In order to investigate the orthotropic damping behavior and its causes of honeycomb composites, and avoid most of the limitations faced in the above-mentioned works, the frequency-dependent damping values of the honeycomb cores are derived from the bending modal loss factors of aluminum/honeycomb sandwich beams in the ribbon (L) and cross (W) directions
Summary
Nomex honeycomb core has been used as a crucial component in weight-sensitive fields such as aerospace and transport packaging, because of its relatively high damping properties, excellent out-of-plane specific stiffness, and low dielectric properties [1,2,3]. In order to investigate the orthotropic damping behavior and its causes of honeycomb composites, and avoid most of the limitations faced in the above-mentioned works, the frequency-dependent damping values of the honeycomb cores are derived from the bending modal loss factors of aluminum/honeycomb sandwich beams in the ribbon (L) and cross (W) directions. These values are validated with the honeycomb sandwich beam and panel. The effect of beam orientation on the anisotropic damping properties of honeycomb sandwich structure is explored based on the verified TSM and damping coefficients of the honeycomb core at last
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