(中南大學(xué) 粉末冶金國家重點(diǎn)實(shí)驗(yàn)室，長沙 410083)
摘 要: 利用有限元軟件ANSYS模擬分析電極結(jié)構(gòu)、壓電陶瓷纖維厚度及體積分?jǐn)?shù)等結(jié)構(gòu)參數(shù)對纖維內(nèi)部電場分布及復(fù)合物驅(qū)動(dòng)應(yīng)變性能的影響規(guī)律。結(jié)果表明：具有交叉指形電極結(jié)構(gòu)的壓電纖維復(fù)合物在纖維內(nèi)部存在不均勻電場區(qū)域，其強(qiáng)度和體積分?jǐn)?shù)共同制約著復(fù)合物的驅(qū)動(dòng)應(yīng)變性能。在恒定電場條件下，當(dāng)交叉指形電極寬度為纖維厚度的一半時(shí)，復(fù)合物具有最大應(yīng)變量；厚度較小的壓電陶瓷纖維內(nèi)部的均勻電場強(qiáng)度較高和體積分?jǐn)?shù)較大，進(jìn)而有利于提高復(fù)合物的驅(qū)動(dòng)應(yīng)變性能。在恒定電壓條件下，電極指間距越大，復(fù)合物的驅(qū)動(dòng)應(yīng)變量越小。當(dāng)指間距和指寬的比＞10時(shí)，應(yīng)變量可達(dá)到理想狀態(tài)的90%。壓電陶瓷纖維體積分?jǐn)?shù)越高的復(fù)合物越容易獲得較大的驅(qū)動(dòng)應(yīng)變性能。
關(guān)鍵字: 壓電纖維復(fù)合物；有限元法；電極結(jié)構(gòu)；壓電陶瓷纖維
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The effect rules of electrode structure, piezoelectric ceramic fiber thickness and volume fraction on the electric field distribution in fiber and strain properties of composite were simulated and analyzed by finite element using ANSYS. The results show that the inhomogeneous zone exists in the fiber of piezoelectric fiber composites with interdigitated electrode. And the strain properties of composite are influenced simultaneously by the field strength and proportion of this zone. When the constant electric field is applied, the highest strain is generated when the electrode width is half of the fiber thickness. The field strength and proportion of the homogeneous zone in the thinner piezoelectric ceramic fiber are higher, which improves the strain properties of the composite. When the constant voltage is applied, the strain decreases with the increase of the electrode separation. 90% of ideal strain can be achieved with the electrode separation to the width larger than 10. The strain properties of the composite can be improved using the piezoelectric fiber with higher volume fraction.
Key words: piezoelectric fiber composites; finite element method (FEM); electrode structure; piezoelectric ceramic fiber
