發(fā)布時間：2018-11-10 16:35

【摘要】：伴隨社會經(jīng)濟的不斷發(fā)展,采用智能傳感監(jiān)測系統(tǒng)的在線健康監(jiān)測和預報,已在重要混凝土建筑工程中廣泛應用。水泥基壓電復合材料擁有低聲阻抗、低機械品質(zhì)因數(shù)以及高機電耦合系數(shù)等特點。這種新型的功能材料可以較好的解決一般智能材料與混凝土結(jié)構(gòu)材料兼容性不佳的問題;且對濕度不敏感,能長久工作在混凝土環(huán)境中。智能材料若失去本要實現(xiàn)的特定功能,則稱之為失效。植入于混凝土結(jié)構(gòu)中的智能傳感器也將隨結(jié)構(gòu)體一起受到靜態(tài)或動態(tài)載荷的作用,發(fā)生傳感信號異常,甚至失效,因而智能傳感材料耦合性能的研究引起了學界的廣泛關注。本文以PZT5H為功能體,普通硅酸鹽水泥為基體,采取切割-澆注法制備了1-3型水泥基壓電復合材料,并對PZT5H材料和1-3型水泥基壓電復合材料分別在準靜態(tài)和動態(tài)載荷下的力電響應特性及其材料損傷失效規(guī)律進行了實驗研究與分析。利用MTS伺服試驗機和分離式Hopkinson壓桿裝置(SHPB)分別對PZT5H和1-3型水泥基壓電復合材料進行準靜態(tài)壓縮實驗和動態(tài)壓縮實驗。由實驗可得:沖擊載荷條件下,PZT5H和1-3型水泥基壓電復合材料的電位移與應力均具有較好的力電響應關系;且隨應變率的增加,在產(chǎn)生相同應變或應力下,所對應的應力或電位移也分別增加;同時,在一定應變率范圍內(nèi),隨應變率的增加,試樣在沖擊載荷下的失效電位移也增加。在準靜態(tài)多次加載條件下,由于電疇反轉(zhuǎn)現(xiàn)象,兩種試樣的電位移幅值均隨著加載次數(shù)的增加而減少;在多次循環(huán)加載下,隨循環(huán)次數(shù)的增加材料的殘余應變累積增加,電位移幅值和剩余電位移均逐步減小,壓電材料的壓電性能也相對減弱,直至力電耦合響應失效。
[Abstract]:With the development of social economy, the on-line health monitoring and forecasting using intelligent sensor monitoring system has been widely used in important concrete construction projects. Cement based piezoelectric composites have the characteristics of low impedance, low mechanical quality factor and high electromechanical coupling coefficient. This new type of functional material can solve the problem of poor compatibility between general intelligent materials and concrete structure materials, and it is insensitive to humidity and can work in concrete environment for a long time. A smart material that loses a specific function that it is intended to achieve is called a failure. The intelligent sensors implanted in concrete structures will also be subjected to static or dynamic loads along with the structure, resulting in abnormal or even invalid sensing signals. Therefore, the research on the coupling properties of intelligent sensing materials has attracted wide attention in the academic field. In this paper, 1-3 type cement-based piezoelectric composites were prepared with PZT5H as functional body and ordinary Portland cement as matrix. The mechanical and electrical response characteristics of PZT5H and 1-3 type cement based piezoelectric composites under quasi-static and dynamic loading respectively and the damage failure law of the materials are studied and analyzed experimentally. The quasi static compression experiments and dynamic compression experiments of PZT5H and 1-3 type cement based piezoelectric composites were carried out by using MTS servo testing machine and separate Hopkinson compression bar device (SHPB) respectively. The experimental results show that the electric displacement and stress of PZT5H and 1-3 type cement based piezoelectric composites have a good electromechanical response under shock loading. With the increase of strain rate, the corresponding stress or electric displacement increases respectively under the same strain or stress, and the failure electric displacement increases with the increase of strain rate in a certain range of strain rate. Under quasi-static multi-loading condition, the amplitude of electric displacement decreases with the increase of loading times due to domain reversal. Under repeated cyclic loading, the residual strain accumulation increases with the increase of cycle times, the amplitude of electric displacement and residual electric displacement decrease gradually, and the piezoelectric properties of piezoelectric materials weaken relatively, until the electromechanical coupling response fails.
【學位授予單位】：寧波大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB33

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