This work describes the measurement of R ‐curve behavior in ferroelectric ceramics using four‐point bend specimens with controlled semielliptical surface cracks. The results are compared for two compositions of lead lanthanum zirconate titanate. One exhibits ferroelastic behavior, the other electrostrictive linear elastic behavior. R ‐curves are measured in the crack length regime of 0.1 to 0.8 mm. The ferroelastic composition displays a toughness increase from 0.5 to 1.2 MPa·m 1/2 . The linear elastic composition displays a flat R ‐curve. The R ‐curve behavior is attributed to ferroelastic toughening.
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Chen et al. (2001) studied this question.
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