(1. 北京空間飛行器總體設(shè)計部，北京 100094；
2. 中南大學(xué)粉末冶金國家重點實驗室，長沙 410083)
摘 要: 壓電纖維復(fù)合物因具有較大的驅(qū)動應(yīng)變和良好的柔韌性而成為智能材料領(lǐng)域的研究熱點之一。采用有限元法分析各結(jié)構(gòu)參數(shù)對壓電纖維復(fù)合物驅(qū)動應(yīng)變性能的影響規(guī)律。結(jié)果表明：電場在交叉指形電極邊緣發(fā)生聚集，且在此區(qū)域的電場強(qiáng)度約為均勻部分電場強(qiáng)度的4倍，因此，應(yīng)用過程中壓電纖維極易在電極邊緣部分因應(yīng)力集中而產(chǎn)生裂紋，從而降低復(fù)合物的驅(qū)動性能；指間距越大，復(fù)合物的驅(qū)動應(yīng)變量及電場分布越接近于理想情況；采用高體積分?jǐn)?shù)的壓電陶瓷纖維、電極與纖維之間較小的聚合物層厚度均有利于提高智能壓電纖維復(fù)合物的驅(qū)動應(yīng)變性能；方形壓電纖維復(fù)合物較圓形壓電纖維復(fù)合物的驅(qū)動應(yīng)變性能至少可提高60%。
關(guān)鍵字: 壓電纖維復(fù)合物；有限元法；壓電陶瓷纖維；應(yīng)變性能
（1. Beijing Spacecraft System Engineering, Beijing 100094, China;
2. State Key laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The piezoelectric fiber composites become one research focus of smart materials due to the larger strain and better stiffness than those of other piezoelectric composite. The influence of structural parameters on actuation strain property of piezoelectric composites was studied by the finite element analysis. The modeling results show that the high electric field near the electrode edge is four times larger than that in the middle of the fiber where the electric field is uniform. So in this area, the piezoelectric fiber easily cracks due to the stress concentration, which leads to the failure of composite. The electric field and the strain are close to the ideal actuator with the increase of the electrode separation. The performance of composite increases by using higher volume of the piezoelectric fiber and smaller thickness of polymer between the fiber and electrode. Compared with the circular fiber composites, the strain property of the square fiber composite is improved at least 60%.
Key words: piezoelectric fiber composites; finite element method; piezoelectric ceramic fiber; strain property
