TY - GEN
T1 - Method for measuring short crack R-curve behavior of ferroelectric ceramic
AU - Chen, Wei
AU - Lynch, Christopher S.
AU - Lupascu, Doru
PY - 1999
Y1 - 1999
N2 - This work describes a method for measurement of R-curve behavior in ferroelectric ceramics using four point bending specimens with a controlled surface crack. A short surface crack is produced by a Knoop indentation and the damage zone is polished away. The results are compared for two compositions of lead lanthanum zirconate titanate (PLZT), an elastio-plastic ferroelectric composition and a linear elastic electrostrictive composition. R-curves are measured in the crack length regime of 0.1 to 0.8 mm. The ferroelastic composition displays a toughness increase from 0.7 to 1.4 MPa√m. The linear elastic composition displays a constant toughness of between 0.6 and 0.7 MPa√m. The R-curve behavior of PLZT 8/65/35 is attributed to ferroelastic toughening.
AB - This work describes a method for measurement of R-curve behavior in ferroelectric ceramics using four point bending specimens with a controlled surface crack. A short surface crack is produced by a Knoop indentation and the damage zone is polished away. The results are compared for two compositions of lead lanthanum zirconate titanate (PLZT), an elastio-plastic ferroelectric composition and a linear elastic electrostrictive composition. R-curves are measured in the crack length regime of 0.1 to 0.8 mm. The ferroelastic composition displays a toughness increase from 0.7 to 1.4 MPa√m. The linear elastic composition displays a constant toughness of between 0.6 and 0.7 MPa√m. The R-curve behavior of PLZT 8/65/35 is attributed to ferroelastic toughening.
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M3 - Conference contribution
AN - SCOPUS:0033294140
SN - 0791816427
T3 - American Society of Mechanical Engineers, Aerospace Division (Publication) AD
SP - 119
EP - 124
BT - American Society of Mechanical Engineers, Aerospace Division (Publication) AD
PB - ASME
T2 - Adaptive Structures and Material Systems - 1999 (The ASME International Mechanical Engineering Congress and Exposition)
Y2 - 14 November 1999 through 19 November 1999
ER -