Title : Analytic modeling and analysis of impact characteristics of composite cylindrical shells with an auxetic honeycomb core subjected to high velocity internal projectile impact
An analytical model is developed to investigate the impact characteristics of composite cylindrical shells with two fiber reinforced polymer (FRP) skins and an auxetic honeycomb core (AHC) subjected to high-velocity internal projectile impact. A strain rate fitting function method is proposed to accurately simulate the dynamic behavior of materials under high-velocity impact loading by updating the elastic moduli. Reddy's higher-order shear deformation theory is utilized to define the structural displacement components, and an improved Gibson theory is applied to determine the equivalent elastic moduli and Poisson's ratios of AHC. The delamination and fracture energy absorption mechanisms of the FRP skins and the core are studied, and the dominant failure modes such as fiber tension, fiber compression, matrix tension, matrix compression, and compression-shear failure of AHC are identified using a 3D Hashin criterion for the skins and a compression-shear coupling failure criterion for the core. The model is roughly validated by comparing the predicted high-velocity impact parameters with literature and ABAQUS simulation results. Furthermore, a high-velocity impact experimental system for penetrating impact tests of such shell specimens is established to obtain the residual velocity, specific energy absorption, ballistic limit, and damage areas on the inner and outer skins of the specimens, with the measured data being employed to give a solid validation of the proposed model. A comprehensive error analysis is also discussed, highlighting the error sources and their impact on the accuracy of such an analytical model.
Audience Take Away Notes:
- A novel composite cylindrical shell with two FRP skins and an AHC is fabricated
- An analytical model of such a shell is established to predict the impact parameters subjected to the internal impact of a high-velocity projectile
- The proposed model is validated through the comparison of literature, ABAQUS simulation, and experimental results