Piezoelectric composites will cause different degrees of deformation when ambient temperature changes during transportation, storage and use, affecting the performance and reliability seriously. The deformation measurement of cylindrical piezoelectric composites based on fiber Bragg grating (FBG) measurement is presented in this paper. The deformation and electromechanical properties of cylindrical piezoelectric composites over a wide range of temperature, from 233 K to 373 K, are investigated in detail. The deformation of piezoelectric composites in different directions is calculated. Adding deformation information, the frequency constant and dielectric constant data are modified. The results show that, at 233 K, the relative change of curvature of the cylindrical composite material in the arc direction is 0.024% and the relative change of deformation in the width and thickness direction are 0.018% and 0.026%, respectively. When the environment's temperature is increased to 100℃, the relative change of curvature in the arc direction is 0.019% and the relative changes of deformation in the width and thickness direction are 0.019% and 0.008%, respectively. After adding the deformation information, the most evident changes of frequency constant and dielectric constant are between 303 K and 333 K, the rate of change (slope) of frequency constant and the dielectric constant are −1.82983 (decreasing) and 3.85591 (increasing), respectively.

中文翻译：

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1-3圆柱弯曲复合材料的温度变形

当环境温度在运输，存储和使用过程中变化时，压电复合材料会引起不同程度的变形，从而严重影响性能和可靠性。本文提出了基于光纤布拉格光栅（FBG）测量的圆柱形压电复合材料的变形测量​​。详细研究了圆柱压电复合材料在233 K至373 K宽温度范围内的变形和机电性能。计算了压电复合材料在不同方向上的变形。添加变形信息后，可以修改频率常数和介电常数数据。结果表明，在233 K下，圆柱形复合材料在电弧方向上的曲率相对变化为0。024％和在宽度和厚度方向上的变形的相对变化分别为0.018％和0.026％。当环境温度升高到100℃时，电弧方向的曲率相对变化为0.019％，宽度方向和厚度方向的变形相对变化分别为0.019％和0.008％。添加变形信息后，频率常数和介电常数的最明显变化在303 K和333 K之间，频率常数和介电常数的变化率（斜率）为-1.82983 在宽度方向和厚度方向上的019％和变形的相对变化分别为0.019％和0.008％。添加变形信息后，频率常数和介电常数的最明显变化在303 K和333 K之间，频率常数和介电常数的变化率（斜率）为-1.82983 在宽度方向和厚度方向上的019％和变形的相对变化分别为0.019％和0.008％。添加变形信息后，频率常数和介电常数的最明显变化在303 K和333 K之间，频率常数和介电常数的变化率（斜率）为-1.82983（减少）和3.85591 （增加）。