Shock Absorption in Shear-Thickening Fluid Included 3D-Printed Structures

In this study, we explore the shock-absorbing potential of shear-thickening fluid (STF) in three-dimensional (3D)-printed structures. For this purpose, an STF was prepared by distributing nano-size silica particles in polyethylene glycol medium. In addition, the STF was reinforced with carbon nanotubes to enhance the stiffness in this smart material. The shear-thickening rheology of the samples was verified in the rheological tests. In the 3D-printing stage, a honeycomb design was used to encapsulate the STF. The bottom and top surface of the honeycomb structures were covered with AA2024 sheets. The specimens were subjected to impact testing with a hemispherical impactor to observe the shock-absorbing properties. Various impact energies were used in the study. Impact loads were collected by a load cell and the results were evaluated. Based on the results, STF application reduces the peak forces developed during the impacting process. A further reduction in the peak forces is achieved by using carbon nanotubes in the STF. It can be stated that STF especially with carbon nanotubes enhances the shock-absorbing properties of the 3D-printed structures.