Ductile fracture of honeycombs

Crack growth initiation and subsequent resistance in a hexagonal honeycomb made out Of ductile base material is investigated in a numerical study. The elasto-plastic base material is characterized by its yield strain, failure strain and the ratio of ultimate strength to yield strength, assuming a bi linear stress-strain relationship. Of the base materials' fracture properti es, only the specific fracture energy is prescribed. K-Resistance curves ar e calculated under the assumption of small scale yielding.