摘要
Structural coatings of nanocrystalline metal can significantly enhance the mechanical properties of microtruss cellular materials, creating new types of cellular composites. This study investigated the optimal architectural design under a compressive load for stretch-formed low carbon steel cores reinforced with similar to 20 nm grain size nanocrystalline Ni-35 wt%Fe. During stretch-forming, the struts in the starting perforated low carbon steel sheet are elongated and thinned as higher internal truss angles are formed, leading to an optimal internal truss angle. While a nanocrystalline coating enhances the weight specific mechanical properties of an optimally designed conventional microtruss, the resulting composite microtruss becomes sub-optimal since the optimal internal truss angle changes with coating thickness. A strut design framework was therefore developed to determine the optimal truss angle for a given combination of starting material, reinforcing material, sheet geometry, and coating thickness.
- 出版日期2012-6