Hierarchical lattice stiffened cylindrical shell: Design, high-order vibration theory and composite parameter identification

A carbon fiber reinforced hierarchical lattice stiffened cylindrical shell (HLSCS) was designed and manufactured. Introducing effects of bending and coupling stiffness caused by neutral plane offsetting, an improved smeared stiffener method was proposed to homogenize the HLSCS to an anisotropic continuous cylindrical shell with varying-stiffness. The transverse shear stiffness was predicted by the higher-order shear deformation theory to build a high order vibration theory. Composite parameter identification method of the HLSCS was proposed based on the experimental and theoretical results to identify the composite parameters nondestructively. The method suggests discounted fiber volume fraction and stiffness for the completed HLSCS.