纤维厚度和体积分数对压电纤维复合物应变性能的影响  

Effects of Fiber Thickness and Volume Fraction on the Strain Performance of Piezoelectric Fiber Composites

作　　者：陈子琪[1] 朱松[1] 林秀娟[1,2] 熊威[3,4] 周科朝[1] 张斗[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]济南大学材料科学与工程学院,济南250022 [3]中南大学材料科学与工程学院,长沙410083 [4]伯明翰大学冶金与材料学院

出　　处：《无机材料学报》2015年第6期571-575,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金(51072235);湖南有色研究基金(YSZN2013CL05);国防基础科研项目(A1420133028)~~

摘　　要：实验制备了不同纤维厚度和体积分数的压电纤维复合物,并在0.1 Hz的激励电压下测试了压电纤维复合物的自由应变性能和驱动性能,研究复合物典型结构参数对其性能的影响。实验发现,随着压电纤维厚度增加,复合物自由应变和顶端位移下降,1000 V激励电压下,纤维厚度为200μm样品纵向自由应变为665με,驱动Mylar膜产生的顶端位移为1.9 mm,而纤维厚度为300μm和400μm样品的纵向自由应变仅为纤维厚度为200μm样品的23.2%和11.7%,顶端位移为纤维厚度为200μm样品的45.8%和19.0%。压电纤维复合物具有驱动正交异性,横向自由应变、纵向自由应变以及横向效应系数随着纤维体积分数的降低而减小,纤维体积分数为74%的复合物其横向自由应变和纵向自由应变分别为体积分数为59%样品的2.04倍和1.72倍,横向效应系数也从0.519减小到0.451。Piezoelectric fiber composite is an emerging smart material and exhibits much broader applications than traditional piezoelectric ceramics, especially in light-weight and curved structures. Piezoelectric fiber composites with different fiber thickness and volume fraction were fabricated. The effects of structural parameters, i.e. different fiber thickness and volume fraction, on the strain properties and actuation performance of piezoelectric fiber composites were investigated at different excitation voltages at frequency of 0.1 Hz. The results indicated that the free strain and tip displacement decreased with the increasing thickness of piezoelectric fiber. When 1000 V voltage was applied, the free strain and tip displacement for the composite with fiber thickness of 200 μm were 665 μm and 1.9 μm, respec- tively, which were much higher than those of composite with fiber thickness of 300 μm or 400 μm. Piezoelectric fiber composites exhibited orthotropic actuation properties, and higher free strains with larger fiber volume fraction. The longitudinal and transverse free strains of composites with 74% fiber volume fraction were 2.04 and 1.72 times mag- nitudes of composites with 59% fiber volume fraction, respectively. The transverse effect coefficient, the ratio between transverse and longitudinal free strains, decreased from 0.519 to 0.451 when the fiber volume fraction decreased from 74% to 59%.

关 键 词：压电纤维复合物 自由应变 顶端位移 正交异性 

分 类 号：TQ174[化学工程—陶瓷工业]