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Lightweight structures directly contribute to the sustainability of aviation, as their use reduces the structural weight of aircraft which in turn reduces fuel burned during flight. One
family of lightweight structures are metal-coated polymers. Hybrid nanocrystalline microtrusses are a member of this family. These structures are fabricated by 3D p...
Contexts in source publication
Context 1
... two compressive instabilities of interest for metal- coated polymer cylinders are local shell buckling and global (or Euler) buckling, as seen in Fig. 2. Local shell buckling is characterized by the appearance of waves on the surface of the cylindrical shell [5,6], while global buckling results in the lateral deflection of a column relative to its original undeformed ...
Context 2
... two compressive instabilities of interest for metal- coated polymer cylinders are local shell buckling and global (or Euler) buckling, as seen in Fig. 2. Local shell buckling is characterized by the appearance of waves on the surface of the cylindrical shell [5,6], while global buckling results in the lateral deflection of a column relative to its original undeformed ...
Citations
... However, the advantages of the new model lie outside the analysis of highly simplified geometry and material conditions shown here. The new model can (where the Karam and Gibson [12] model cannot) be adapted easily for cores that are not solid and instead have cylindrical holes through their axes, and for shells that are not bonded to the cores [2]. Experiments have shown that all three of these issues are significant for realistic geometries and material properties [2]. ...
... The new model can (where the Karam and Gibson [12] model cannot) be adapted easily for cores that are not solid and instead have cylindrical holes through their axes, and for shells that are not bonded to the cores [2]. Experiments have shown that all three of these issues are significant for realistic geometries and material properties [2]. ...
Increasing the environmental sustainability of aviation is a key design goal for commercial aircraft for the foreseeable future. From the perspective of structural engineering, this is accomplished through reducing the mass of aircraft components and structures. Advanced manufacturing techniques offer new avenues for design, enabling more complex structures which can have highly tailored properties. One advanced manufacturing concept is the use of 3D printed polymer preforms that are coated with nanocrystalline metal through electrodeposition. This enables the use of high-performance materials in virtually any geometry. To exploit this manufacturing approach, it is incumbent to have well-established mechanical models of the behavior of such hybrid structures. In particular, hybrid polymer–nanometal structures tend to fail due to compressive instabilities. This paper describes a model of local shell buckling, a typical compressive instability, as it applies to hybrid polymer–nanometal structures. The analysis depends upon the Southwell stress function model for radially loaded solids of rotation, and couples this with the Timoshenko analysis of local shell buckling. This combination is applicable to a range of practical configurations for truss-like hybrid structures.