Cyclic Mechanical Fatigue Lifetime of Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>-Based Eco-Piezoceramics
The mechanical strength and cyclic fatigue behavior of PIC700 commercial eco-piezoceramic disks are investigated under biaxial loading on unpoled and poled samples. The bending strength of unpoled samples was higher than those of poled ones. Fatigue tests were conducted under a load ratio of 10 at a...
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| Online Access: | https://www.mdpi.com/1996-1944/14/15/4113 |
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| author | José F. Bartolomé Luis E. Fuentes-Cobas Álvaro García Alfredo Jacas Lorena Pardo |
| author_facet | José F. Bartolomé Luis E. Fuentes-Cobas Álvaro García Alfredo Jacas Lorena Pardo |
| author_sort | José F. Bartolomé |
| collection | DOAJ |
| description | The mechanical strength and cyclic fatigue behavior of PIC700 commercial eco-piezoceramic disks are investigated under biaxial loading on unpoled and poled samples. The bending strength of unpoled samples was higher than those of poled ones. Fatigue tests were conducted under a load ratio of 10 at a frequency of 20 Hz with a sinusoidal waveform. The curve fitting for the S-N fatigue diagram is used to predict the lifetime of these eco-piezoceramics and describe their fatigue behavior. It was also found that the unpoled samples exhibited higher fatigue resistance than the poled ones. The fatigue limit of maximum load for ten million cycles of unpoled and poled samples was estimated to be 160 and 135 MPa, respectively. The detailed observations of the fatigue fracture surfaces by scanning electron microscopy (SEM) indicated that a wavy surface with a mixture of transgranular and intergranular fractures occurred preferentially in the case of the poled material. On the other hand, transgranular fractures seem to be predominant in the unpoled samples. It appears that the poling process causes the change in failure characteristics due to domain orientation that leaves an anisotropic stress field in the material. The poled ceramics possess a local stress concentration created by the orientation under the electric poling field of the 90° ferroelectric–ferroelastic domains. Under this local stress concentration, a microstructural degeneration is induced by domain switching under the cyclic load that accelerates crack growth, thereby reducing fatigue lifetime. |
| first_indexed | 2024-03-10T09:13:32Z |
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| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T09:13:32Z |
| publishDate | 2021-07-01 |
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| spelling | doaj.art-f3d2ab12590b4a7c8a20dd6ba90dd91a2023-11-22T05:51:54ZengMDPI AGMaterials1996-19442021-07-011415411310.3390/ma14154113Cyclic Mechanical Fatigue Lifetime of Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>-Based Eco-PiezoceramicsJosé F. Bartolomé0Luis E. Fuentes-Cobas1Álvaro García2Alfredo Jacas3Lorena Pardo4Instituto de Ciencia de Materiales de Madrid, CSIC, 28049 Madrid, SpainCentro de Investigación en Materiales Avanzados, S.C., Chihuahua 31136, MexicoInstituto de Ciencia de Materiales de Madrid, CSIC, 28049 Madrid, SpainInstituto de Ciencia de Materiales de Madrid, CSIC, 28049 Madrid, SpainInstituto de Ciencia de Materiales de Madrid, CSIC, 28049 Madrid, SpainThe mechanical strength and cyclic fatigue behavior of PIC700 commercial eco-piezoceramic disks are investigated under biaxial loading on unpoled and poled samples. The bending strength of unpoled samples was higher than those of poled ones. Fatigue tests were conducted under a load ratio of 10 at a frequency of 20 Hz with a sinusoidal waveform. The curve fitting for the S-N fatigue diagram is used to predict the lifetime of these eco-piezoceramics and describe their fatigue behavior. It was also found that the unpoled samples exhibited higher fatigue resistance than the poled ones. The fatigue limit of maximum load for ten million cycles of unpoled and poled samples was estimated to be 160 and 135 MPa, respectively. The detailed observations of the fatigue fracture surfaces by scanning electron microscopy (SEM) indicated that a wavy surface with a mixture of transgranular and intergranular fractures occurred preferentially in the case of the poled material. On the other hand, transgranular fractures seem to be predominant in the unpoled samples. It appears that the poling process causes the change in failure characteristics due to domain orientation that leaves an anisotropic stress field in the material. The poled ceramics possess a local stress concentration created by the orientation under the electric poling field of the 90° ferroelectric–ferroelastic domains. Under this local stress concentration, a microstructural degeneration is induced by domain switching under the cyclic load that accelerates crack growth, thereby reducing fatigue lifetime.https://www.mdpi.com/1996-1944/14/15/4113bismuth sodium titanatebarium titanatepiezoelectricitydielectric propertiespolingmechanical properties |
| spellingShingle | José F. Bartolomé Luis E. Fuentes-Cobas Álvaro García Alfredo Jacas Lorena Pardo Cyclic Mechanical Fatigue Lifetime of Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>-Based Eco-Piezoceramics Materials bismuth sodium titanate barium titanate piezoelectricity dielectric properties poling mechanical properties |
| title | Cyclic Mechanical Fatigue Lifetime of Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>-Based Eco-Piezoceramics |
| title_full | Cyclic Mechanical Fatigue Lifetime of Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>-Based Eco-Piezoceramics |
| title_fullStr | Cyclic Mechanical Fatigue Lifetime of Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>-Based Eco-Piezoceramics |
| title_full_unstemmed | Cyclic Mechanical Fatigue Lifetime of Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>-Based Eco-Piezoceramics |
| title_short | Cyclic Mechanical Fatigue Lifetime of Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>-Based Eco-Piezoceramics |
| title_sort | cyclic mechanical fatigue lifetime of bi sub 0 5 sub na sub 0 5 sub tio sub 3 sub based eco piezoceramics |
| topic | bismuth sodium titanate barium titanate piezoelectricity dielectric properties poling mechanical properties |
| url | https://www.mdpi.com/1996-1944/14/15/4113 |
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