Length-scale-controlled interfacial toughening and weakening in metal/ceramic layered materials

摘要

The dislocation shielding model is employed in this paper to analyse interfacial toughening in metal/ceramic layered materials in terms of dislocation plasticity. The dislocation emission in cracked layered materials is investigated. Emitted dislocation will pile up against the bonded interface and the superdislocation assumption is employed to look at the shielding effect. The interface crack tip field is modified and crack propagation is investigated in detail under the mixed-mode loading condition. The effects of length scale (metal layered thickness) and interfacial strength are examined. It is demonstrated that a thicker metal layer, stronger interface and higher mode II loading component are preferable for higher toughness. [References: 31]