Fatigue of honeycombs under in-plane multiaxial loads

Modeling for fatigue of honeycombs under in-plane multiaxial loads is proposed and presented here. Paris law for microcrack propagation, Basquin law for high cycle fatigue and Coffin–Manson law for low cycle fatigue are employed to describe the fatigue of solid cell walls within honeycombs, respectively. As a result, the number of cycles to failure of honeycombs can be obtained by using a cell-wall-bending model and dimensional argument analysis. It is found that the fatigue of honeycombs under in-plane multiaxial loads depend on cyclic stress range, pre-existing macrocrack and microcrack lengths, cell size, relative density and the fatigue parameters of solid cell wall material.