Damping Behavior of Hybrid Composite Structures by Aeronautical Technologies

Abstract

Hybrid composite laminates are manufactured by using technologies and raw materials of the aeronautic sector with the aim to improve the damping behavior of composite structures. Matrix hybridization was achieved by laminating carbon fiber reinforced (CFR) plies with elastomer interlayers. Up to 10 different composite sandwich architectures were investigated by changing the stacking sequence, the thickness of the elastomer layers, and the elastomer typology, whereas the total number of the CFR plies was fixed to six for all the hybrid composites. Square panels with the size of 300 × 300 mm2 were autoclave molded with vacuum bagging, and rectangular samples were extracted for static and dynamic tests. Dynamic mechanical analyses were performed to measure the storage modulus and loss factor of hybrid materials, which were compared with static and dynamic performances of the composite structures under bending. Repeated loading–unloading cycles and free oscillation tests allowed us to the energy loss per unit of volume, and the acceleration damping, respectively. Results show that softest elastomer interlayers lead to big loss of stiffness without any positive effect in the damping behavior, which worsens as well. By using soft elastomers, complex architectures do not provide any additional benefit in comparison with the traditional sandwich structure with soft core and hard skins.

Synthesis of an Aluminum Alloy Metal Matrix Composite Using Powder Metallurgy: Role of Sintering Parameters

“…The synergetic effect of multiple reinforcements such as SiC/Al 2 O 3 in an Al matrix alters the porosity that causes the variation in the mechanical properties of Al metal matrix composites [23,24]. Recently, hybrid metal matrix composites have attracted attention for use in different applications and research has been carried out to understand the various properties that these hybrid composites have to offer [25][26][27][28][29][30][31]. Zhang et al (2020) [25] studied the evolution of the microstructure of two varieties of hybrid composites such as Al/SiC/graphite and Al/SiC/graphene by the PM process, where graphene in the Al and nanostructure composite could be formed.…”

“…Manohar et al (2022) [29] investigated the microstructure and mechanical properties of Al7075/graphite/SiC hybrid composites; they found that 8 vol.% of graphite and 2 vol.% of SiC maximized the mechanical properties. Proitte et al (2022) [30] studied the damping behavior of a fiber composite in aeronautical technology. In addition to ceramic reinforcements, iron oxide (Fe 2 O 3 ) is also used to make hybrid composites [31].…”