The round shaft that needs to be subjected to torsional loading is a class of common engineering component in engineering structures. The purpose of this paper is mainly to find the mechanical relationship under torsional loading for the lightweight round shaft with metal foam as the core and dense metal tube as the shell.
On the basis of the octahedral model of porous materials, the mechanical relationship would be deduced for both the round tube shell and the metal foam core of the composite round shaft, to which torsion occurs.
The non-margin design can be characterized by the mechanical relationship for this composite round shaft, and the mathematical model is also established to design the metal foam core in the composite round shaft under safe loading.
The composite round shaft with metal foam as the core and dense metal tube as the shell could be a new type of lightweight round shaft with excellent comprehensive performances. Here the metal foam core with an open-cell reticular structure can be the functional part with multidiscipline functions, like sound absorption, noise reduction, energy absorption, vibration reduction and heat exchange. Thus, this class of composite round shaft has a comprehensive advantage in both mechanical and physical properties.
