A novel three-dimensional structure model of biomimetic staggered composites. (1st May 2020) - Hao, Rui
Abstract: The staggered structure is considered to be one of the key factors for the excellent mechanical properties of bone. In order to solve the problem of non-uniform stress distribution in the hard component of the original biomimetic staggered composites, a novel three-dimensional structure model with pores is proposed in this paper. By generalizing the shear lag theory model of the original staggered structure to the new model, the constitutive relation of the porous structure is established. On this basis, the stress distribution with respect to the aspect ratio of the hard prisms is studied. Finally, the two composite models are simulated by finite element method. The results show that stress in the novel structure tends to be uniformly distributed under external force. So it has higher stiffness and strength to mass ratio, and maintains stronger toughness. It is illustrated that pores in staggered structure can help to fully exploit the mechanical potential of each phase in the composites, providing an explanation for the existing of large number of voids in bone. This study may have an important inspiration for designing lightweight load-bearing composites with high efficiency of vibration isolation and cushioning.