Nonlinear mechanical response of PZT95/5 ferroelectric ceramics under high strain rate loading

LI Chenghua; JIANG Zhaoxiu; WANG Beiqiao; ZHANG Zhen; WANG Yonggang

doi:10.11883/bzycj-2016-0329

Volume 38 Issue 4

May 2018

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LI Chenghua, JIANG Zhaoxiu, WANG Beiqiao, ZHANG Zhen, WANG Yonggang. Nonlinear mechanical response of PZT95/5 ferroelectric ceramics under high strain rate loading[J]. Explosion And Shock Waves, 2018, 38(4): 707-715. doi: 10.11883/bzycj-2016-0329

Citation:

LI Chenghua, JIANG Zhaoxiu, WANG Beiqiao, ZHANG Zhen, WANG Yonggang. Nonlinear mechanical response of PZT95/5 ferroelectric ceramics under high strain rate loading[J]. Explosion And Shock Waves, 2018, 38(4): 707-715. doi: 10.11883/bzycj-2016-0329

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Nonlinear mechanical response of PZT95/5 ferroelectric ceramics under high strain rate loading

doi: 10.11883/bzycj-2016-0329

Key Laboratory of Impact and Safety Engineering, Ministry of Education of China, Ningbo University, Ningbo 315211, Zhejiang, China

Received Date: 2016-10-31
Rev Recd Date: 2017-03-04
Publish Date: 2018-07-25

Abstract

Abstract

In this study we fabricated four kinds of unpoled PZT95/5 ferroelectric ceramics in a range of different porosity levels by systematic additions of pore formers and investigated the high strain rate response of the unpoled PZT95/5 using the ultra-high speed camera and digital image correlation (DIC) technique to measure the full-field strain in a split Hopkinson pressure bar (SHPB) test. Based on the results of the full-field strain, we found that the strain distribution is uniform in the middle of the specimen and its average value as the strain of the specimen is more reasonable than the strain calculated from the traditional theory of SHPB. By using the pulse shaping technique to obtain an early constant strain rate, the effect of the lateral inertia confinement can be eliminated. The apparent dynamic compressive strength enhancement of the unpoled PZT95/5 in a SHPB test was observed to be strain-rate sensitive. Based on the variation of the axial strain and radial strain with axial stress, we attributed the nonlinear deformation mechanism of the unpoled PZT95/5 to the domain switching and phase transformation. The critical stresses for the domain switching and phase transformation increased with the strain rate. In addition, we discussed the influence of porosity in the high strain-rate response, and the results indicated that the dynamic compressive strength and the critical stresses for the domain switching and phase transformation of the unpoled PZT95/5 decreased with the increase of porosity.
- ferroelectric ceramics,
- high strain rate,
- porosity,
- domain switching,
- phase transformation

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References(22)

References

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