Fatigue of honeycombs under in-plane multiaxial loads

Modeling for fatigue of honeycombs under in-plane multiaxial loads is propo sed and presented here. Paris law for microcrack propagation, Basquin law f or high cycle fatigue and Coffin-Manson law for low cycle fatigue are emplo yed to describe the fatigue of solid cell walls within honeycombs, respecti vely. As a result, the number of cycles to failure of honeycombs can be obt ained 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 leng ths, cell size, relative density and the fatigue parameters of solid cell w all material. (C) 2001 Elsevier Science B.V. All rights reserved.