Study on 2-2 cement based piezoelectric composite

在土木工程領域中 ,智能結構系統越來越受到人們的重視 ,而在智能結構系統中機敏材料是不可缺的元素 ,它是構成智能結構中的傳感器和驅動器的關鍵材料。針對目前土木工程領域智能結構中存在的結構材料與機敏材料相容性差問題 ,采用水泥基材料作為壓電機敏復合材料的基體 ,通過調節水泥基材料組分和比例 ,克服水泥基材料與壓電陶瓷在密度上的懸殊差異為材料準備帶來的困難 ,制備出 2 - 2型水泥基壓電機敏復合材料。同時 ,采用集成了微型計算機、MTS自動伺服試驗機、示波器、信號發生器、線性放大器和 HP- IB界面的測試系統測量 2 -2型水泥基壓電復合材料的彈性性能、傳感性能和驅動性能。實驗結果表明 ,在實驗范圍里 ,該材料具有線彈性性能 ;傳感性能和驅動性能具有明顯的頻率依賴性 ;在超低頻范圍內 ,2 - 2型水泥基壓電復合材料的壓電電壓系數的模值隨頻率線性增大 ,相角隨頻率增大開始時增大較快 ,隨后趨于一常數 ;2 - 2型水泥基壓電復合材料的壓電性能與聚合物基壓電復合材料相似。Intelligent structures are attracting more attention of scientists and engineers in the field of civil engineering.In an intelligent structure,smart materials play animportant role,from which sensors and actuators are made.In order to solve the mismatch problem between smart materials and host materials,which is popular in the application of intelligent structures in the civil engineering field.Cement based materials were chosen to be the matrix of piezoelectric smart materials.Through adjusting the mix proportion and selecting the components of cement based matrix,problems of fabrication of 2 2 cement based piezoelectric composite were overcome.Using a testing system integrating computer,MTS tester,oscilloscope,signal generator,linear amplifier,HP IB interface hardware and software,the elastic,sensory and actuating properties were studied.The following results can be obtained.The composite is linearly elastic.The sensory and actuating properties have obvious dependence on frequency.In the range of ultra low frequency,the magnitude of piezoelectric voltage factor of the composite increases linearly with frequency,the phase increases quickly at first,but then approaches to a constant,The piezoelectric properties of the composite are similar to those of polymer/ceramic piezoelectric composites.