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提出利用数字散斑相关方法测量材料的电致伸缩性能的新方法.通过数字散斑相关方法得到面内位移,从而由几何三角关系得到离面位移,实现电致伸缩应变的测量.采用该方法对高电场作用下钛酸钡/聚氨酯复合高分子材料的电致伸缩性能进行了测量.在高电场作用下,对重复加电放电过程进行分析,得到电致伸缩应变,从而获取材料的电致伸缩系数.实验中采用双线性插值方法获取亚象素灰度值,以提高测量精度,并将结果与曲面拟合算法的计算结果进行了比较.结果表明:钛酸钡的加入提高了聚氨酯材料的电致伸缩性能;数字散斑相关方法可以有效地实现材料的电致伸缩系数的测量.该方法为电致伸缩性能的研究提供了一种有效的工具.
A new method to measure the electrostrictive property of materials by using digital speckle correlation method is proposed.The in-plane displacement is obtained by digital speckle correlation method, and the out-of-plane displacement is obtained from the geometric trigonometry to measure the electrostrictive strain.Using this method The electrostrictive performance of barium titanate / polyurethane composites under high electric field was measured.Under the action of high electric field, the process of repeated charge and discharge was analyzed to obtain the electrostrictive strain, Stretching coefficient.The bilinear interpolation method was used to obtain the gray value of sub-pixel in order to improve the measurement accuracy.The results of calculation were compared with those of the surface fitting algorithm.The results showed that the addition of barium titanate increased the content of polyurethane The electrostrictive performance of the material can be measured by the digital speckle correlation method, which can effectively measure the electrostrictive coefficient of the material. This method provides an effective tool for the study of electrostrictive properties.