Size Effect of Aluminum Honeycomb Under Quasi-static Indentation

Abstract

In this paper, three different shapes of indenters were used to perform quasi-static out-of-plane uniaxial compression and indentation tests on three commercial hexagonal aluminum honeycombs with different densities. In order to distinguish the different tearing conditions of the single-layer and double-layer aluminum honeycomb walls during indentation, a new indentation experiment was designed. By controlling the shape of pattern and the location of indentation, different tearing conditions in indentation experiment were measured separately. The deformation mode of the aluminum honeycomb when pressed was analyzed. It is found that as the size of the pattern increases, the peak stress of the indentation experiment decreases significantly. As the size of the indenter increases, the platform stress of aluminum honeycomb shows a downward trend and tends to approach the compression platform stress, while the tear strength remains basically stable within a certain scale. As the size of the indenter continues to increase, the proportion of tearing force to the total indenting force gradually decreases, and the tearing strength loses its stability. At this time, the tear strength can no longer be used as a stable mechanical parameter to measure the tearing condition during indentation.

Keywords

• aluminum honeycomb
• indentation
• platform stress
• tear strength
• size effect