摘要 : Low fracture toughness of ferroelectric ceramics calls for a reliability concern in the development of smart structures. For ferrolelectrics under mechanical and electrical loadings, the intensified stress and electric fields in t... 展开 Low fracture toughness of ferroelectric ceramics calls for a reliability concern in the development of smart structures. For ferrolelectrics under mechanical and electrical loadings, the intensified stress and electric fields in the vicinity of a crack-like flaw led to domain reorientation. The switched domains induce incompatible strain near the flaw and consequently change the apparent fracture toughness. The present paper investigates toughness variation by small scale polarization switching under non-uniform electric and stress fields. 收起