Coupling Effect of Electric Field, Residual Stress and Medium on Propagation of Indentation Cracks in A PZT--5H Ceramic
HUANG Haiyou; SU Yanjing; QIAO Lijie; GAO Kewei; CHU Wuyang
Department of Materials Physics; University of Science and Technology Beijing; Beijing 100083
Cite this article:
HUANG Haiyou; SU Yanjing; QIAO Lijie; GAO Kewei; CHU Wuyang. Coupling Effect of Electric Field, Residual Stress and Medium on Propagation of Indentation Cracks in A PZT--5H Ceramic. Acta Metall Sin, 2005, 41(1): 36-.
Abstract The experiment of a coupling effect
on propagation of unloaded indentation cracks in a PZT--5H ceramic
shows that residual
stress itself is too small to induce delayed propagation
of the indentation crack in silicon oil. If
applied constant electric field is larger than
0.2 kV/cm, the coupling of electric field, residual stress
and silicon oil can cause delayed propagation of the
crack after incubation time, but the crack will arrest after
propagating for 10---30 um because of decrease of the stress
intensity factor with increasing the crack length. The threshold
electric field of delayed propagation of the
crack in silicon oil is EDP=0.2 kV/cm. If the
field is larger than the critical field of 5.25 kV/cm,
coupling of the electric field and residual stress is enough to cause
instant propagation of the crack
and propagates continuously, then arrests if under the constant
electric field. If the applied field is
larger than 12.6 kV/cm, even if no residual
stress, the electric field itself can make many
cracks initiate, grow and connect in a smooth specimen,
resulting in delayed failure. The threshold
electric field of delayed failure of a smooth
specimen in silicon oil is 12.6 kV/cm and the
critical electric field for instant failure is EF=19.1
kV/cm.
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