Development of Solid-Air Composites for Load Dispersion by Biomimetic Design: Load Dispersion Ability Under Dynamic Loading condition

摘要

Nature has developed many novel solutions and extracting these design solutions from nature is known as biomimetics. Cancellous bone contains trabecular bone (solid) and marrow (fluid), plays an important role for load transfer of the knee joint. The objective of this research is to mimick the solid-liquid composition of the cancellous bone and to develop the material that has the excellent load dispersion ability. In the previous research, the solid-liquid composition of the cancellous bone has been modeled as solid-air composites that was made with Al honeycomb and silicon films. Air pressure in cells affected the load dispersion characteristic under static loading condition. In this study, to investigate the influence of the compression speed, impact tests were carried out. We investigated the influence of directions of holes to cell walls, foil thickness, hole diameter and the number of holes on the load dispersion ability. Presence of silicon film and air in cells affected the load dispersion characteristic under dynamic loading condition. Solid - air composition and relaxing local deformation by optimal design improve load dispersion ability.