About this Abstract |
Meeting |
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
Symposium
|
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
Presentation Title |
Effect of Manufacturing Imperfections in Sandwich Composites with Aluminum Honeycomb in Multi-Axial Loading |
Author(s) |
Adrian Xavier Rivera, Satchi Venkataraman, Kim Hyonny, Evan Pineda, Andrew Bergan |
On-Site Speaker (Planned) |
Adrian Xavier Rivera |
Abstract Scope |
Sandwich composites use aluminum honeycomb as a core material between thin and axially rigid facesheet materials, significantly improving bending stiffness and buckling strength. However, honeycomb cores are susceptible to impact damage as well as manufactured induced imperfections. Geometric imperfections in honeycomb core characterized by detailed X-ray computer tomography include cell shape distortions, cell wall waviness, non-uniform cell wall thickness, and variability in the shape and height of the adhesive fillet. Previous work investigated transverse compression response of honeycomb cores with manufacturing imperfections modeled using finite element analysis of honeycomb cores reconstructed from X-ray CT images and modeled as shell elements. The cell wall waviness of the honeycomb core along its thickness direction had the largest effect on both compression strength and stiffness. Under impact with blunt bodies, honeycomb cores experience both transverse compression and transverse shear. This paper will present results of the investigation into the multi-axial (combined transverse compression and transverse shear) responses of honeycomb cores with actual measured manufacturing imperfections of honeycomb cores from different batches at different expansion levels. Failure surfaces in the strain space are obtained using FEA of honeycomb cores with imperfections under strain control at different strain ratios. The failure surfaces that correspond to initiation of elastic buckling, plastic yield and plastic core collapse are shown to couple with the deformation of through thickness geometric imperfections that can both stiffen or soften the combined shear and compression response depending on direction of the applied shear. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |