Quasi-static and dynamic fracture behavior of lead zirconate titanate: A study of poling and loading rate

In this study, coupon specimens of both poled and de-poled lead zirconate titanate (PZT) are examined under quasi-static stress-wave loading conditions. Mode-I crack initiation fracture behavior is using ultra high-speed imaging in conjunction with 2D digital image correlation on symmetrically impacted specimens. Measured displacement fields ahead the dynamically loaded tip used to extract critical stress intensity factor (KICd) at compared SENT toughness tests. Results demonstrate that static conditions, difference between not statistically significant, however dynamic samples exhibited a 70% greater To verify increase was due thermal degradation material mechanical properties during de-poling process, re-poled were also prepared general, impulsively their quasi-statically counterparts, regardless poling. Specifically, increased seven tenfold values, exhibiting greatest all explored. terms rate, conditions likely comes from microcracking potentially phase transformations tip. poling, bulk manifestation ferroelastic toughening, where domain reorientation provides shielding.