基于磁电复合材料的索力传感器制备及性能试验

针对斜拉桥工程结构高精度、高灵敏、高稳定性的检测要求，设计制备了一种多层磁电复合材料的新型索力传感器。在磁致伸缩材料尺寸最优条件下，运用环氧树脂、银导电胶粘结技术和涂胶厚度控制技术，使Terfenol-D合金与PMN-PT压电晶体、两个电极片与压电晶体均匀粘结固化，制备成层状磁电复合材料。采用漏磁场小、抗干扰好的磁回路结构设计，通过有限元方法获得复合材料驱动磁场和偏置磁场的工作范围。并在拉力试验机上进行了传感器动态性能试验。研究表明，新型索力传感器精度提高1%，响应时间最大减少50%，适合于复杂多变环境下斜拉桥索力的精确可靠检测。

Studies on Cable Force Sensor Based on Magneto-electric Composite Materials

For cable-stayed bridge engineering structures with high accuracy, high sensitivity, high stability testing requirements, a multilayer magnetoelectric composite model of cable tension sensor is designed and fabricated. In the magnetostrictive material under the condition of the optimal size, using the epoxy resin, silver conductive adhesive and coating thickness control technology to make Terfenol-D alloy with PMN-PT piezoelectric crystals and electrodes with piezoelectric crystal uniform adhesive curing, layered magnetoelectric composite materials was prepared. Using small leakage magnetic field and good anti-jamming structure design of magnetic circuit, finite element method is used to obtain the composite materials of driving magnetic field and the bias magnetic field normal working range. The dynamic performance test of sensor in a tensile testing machine is carried out. Studies have shown that compared with the traditional magnetic flux sensor, new type of cable force sensor precision is increased by 1%; the maximum response time reduced by 50%.It is suitable for accurate and reliable test of cable-stayed bridge under the complicated and changeful environment.