Numerical Simulations on Compressive Response of Closed-cell Aluminum Foam
|關鍵字:||封閉式泡沫鋁材料;數值模擬;受壓力學;Close-cell Foam;Alporas;Numerical simulation;Compressive Response|
The present study aims to investigate the mechanical response of closed-cell aluminum foam under uniaxial compressive loading by means of numerical simulation efforts. Motivated by the measurements conducted on real foam microstructure, two kinds of numerical models, including shell-solid and purely shell models, based on perfect Kelvin structure have been developed. The characteristic cell homogenization approach was then incorporated to simulate the Young’s modulus as well as the initiation stress of the foam compressive response. Numerical results on both parameters were seen to overestimate the experimental ones by a large margin. Additional geometric features of the foam microstructure such as the cell wall curvature, the cell edge curvature…etc. were characterized through the comparison drawn between the perfect Kelvin numerical models and the real foam microstructure. Modified Kelvin models were then developed subsequently based upon the implementations of the newly characterized real foam geometric features and the effect of each of the features was examined accordingly. The resulting modified Kelvin models outperformed the perfect Kelvin ones greatly on the simulation of Young's modulus and the initiation stress. Finally, the finite-sized modified numerical models were used to simulate the complete mechanical response of closed-cell foam under compressive loading. Using the modified models, the overall mechanical response, the deformation patterns as well as the deformation evolution were reproduced successfully.
|Appears in Collections:||Thesis|