Fracture toughness anisotropy of PZT

Fracture Mechanics of Piezoelectric and Ferroelectric Solids

“…Another kind of anisotropy was discovered by , , Calderon-Moreno et al (1997), Park et al (1998) in Vickers indentation tests performed with polarized BaTiO 3 and PZT. In polarized ferroelecric ceramics under the action of mechanical load only, fracture toughness of the crack along the poling direction was relatively higher, and that perpendicular to the poling direction was relatively lower.…”

Effect of PbO content, loading rate and poling on mechanical properties of tape-cast and sintered PZT wafers

“…The poling process is also the origin of a complex state of residual stresses. There are also very limited studies in the literature on the effect of poling on mechanical properties and those are also confined to the effect of poling on fracture toughness of bulk PZT [7,8,11,12]. The present study reports the mechanical properties of tape-cast PZT wafers having different PbO content.…”

“…PZT devices also experience strong mechanical and electrical loading conditions during their operation over a wide range of loading rates and there is an increasing interest in the study of mechanical behaviour of piezoelectric materials under different types of load [7][8][9]. The effect of loading rate on mechanical properties of PZT wafers is, however, not reported in literature.…”

Thermal Depoling Effects on Anisotropy of Lead Zirconate Titanate Materials

“…6 More recently Calderon-Moreno and co-workers have claimed that the indentation test exaggerates the fracture toughness anisotropy measured in indentation of poled PZT compared to results from the single notch bend (SENB) method. 15,16 They argued that the anisotropic residual stress field in poled materials increases the fracture anisotropy. Our results show that orientation, elastic anisotropy, and fracture anisotropy are correlated in these materials.…”