Mechanical and electrical strain response of a piezoelectric auxetic PZT lattice structure
Mechanical and electrical strain response of a piezoelectric auxetic PZT lattice structure
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DOI：
10.1088/0964-1726/25/1/015017
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发表时间：
2016-01-01
影响因子：
4.1
通讯作者：
Greil, Peter
中科院分区：
文献类型：
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作者：
Fey, Tobias;Eichhorn, Franziska;Greil, Peter
用PZT压电陶瓷制作了一种二维伸展晶格结构。将厚度为530µm的流延和烧结板激光切割成倒置蜂窝状晶格结构，晶胞几何尺寸为-25°，极化方向垂直于晶格面。通过二维图像数据检测分析，分析了单轴压缩载荷和垂直于晶格面的电场作用下的面内应变响应。伸展晶格结构表现出正交异性变形行为，面内泊松比为-2.05。与PZT块体材料相比，压电伸展晶格的应变放大倍数为30-70倍。测得PZT晶格的有效横向耦合系数d(31)(Al)大于4×10(3)pm V-1，其有效静水压系数d(H)(Al)是块体PZT的66倍。
A two-dimensional auxetic lattice structure was fabricated from a PZT piezoceramic. Tape casted and sintered sheets with a thickness of 530 mu m were laser cut into inverted honeycomb lattice structure with re-entrant cell geometry (theta = -25 degrees) and poling direction oriented perpendicular to the lattice plane. The in-plane strain response upon applying an uniaxial compression load as well as an electric field perpendicular to the lattice plane were analyzed by a 2D image data detection analysis. The auxetic lattice structure exhibits orthotropic deformation behavior with a negative in-plane Poisson's ratio of -2.05. Compared to PZT bulk material the piezoelectric auxetic lattice revealed a strain amplification by a factor of 30-70. Effective transversal coupling coefficients d(31)(al) of the PZT lattice exceeding 4 x 10(3) pm V-1 were determined which result in an effective hydrostatic coefficient d(h)(al) 66 times larger than that of bulk PZT.