The Compressive Response and Deformation Evolution of Closed-cell Aluminum Foam
|關鍵字:||封閉式泡沫鋁材料;數值模型;幾何缺陷;受壓力學響應;變形演進;ALPORAS;Numerical model;Geometric characteristic factors;Compressive response;Deformation evolution|
The present study aims to investigate the compressive mechanical properties of closed-cell aluminum foam under uniaxial compression by means of both experimental and numerical efforts. Crushing experiments were first conducted along two mutually perpendicular directions during which the deformation patterns and their evolutions were recorded using the micro-CT technique. In an effort to reproduce the experimental findings numerically, an ideal and several modified numerical models, both having a bi-dispersed cell size distribution and based on realistic geometric features of the cellular microstructure, were subsequently developed. The ideal model overestimated the compressive response by a large margin as compared to the experimental results whereas the modified models lead to numerical results which are much closer to experimental ones. In addition, the mechanical constants such as the Young’s modulus decreased as the geometric characteristic factors increased. Numerical simulations on the complete compressive response were also performed using the numerical models developed. Similar to the case of mechanical constants, the modified models outperformed the ideal model in terms of the complete response, the deformation patterns as well as the deformation evolutions.
|Appears in Collections:||Thesis|