本文選題：骨 + 壓電性�。� 參考：《天津大學(xué)》2012年碩士論文

【摘要】：骨是具有壓電性的各向異性材料,然而由于骨的復(fù)雜的微觀結(jié)構(gòu),其壓電性質(zhì)也非常復(fù)雜。骨內(nèi)由于應(yīng)力的作用產(chǎn)生電信號(hào),電信號(hào)有可能影響到骨細(xì)胞的生長(zhǎng),因此研究骨的壓電效應(yīng)有重要的現(xiàn)實(shí)意義。然而僅僅研究骨的正壓電效應(yīng)是不夠的,不足以全面掌握骨壓電效應(yīng)的具體性質(zhì)。因此也同樣需要我們對(duì)骨的逆壓電效應(yīng)進(jìn)行探究。 本實(shí)驗(yàn)研究測(cè)量了牛骨薄梁試樣逆壓電效應(yīng)彎曲變形的位移。選取7個(gè)牛骨試件,分別在其厚度為1mm、0.8mm、0.6mm、0.5mm、0.3mm(高度均為50mm,寬均為10mm)的狀態(tài)下進(jìn)行試驗(yàn)。牛骨試件被放置于由兩個(gè)電極板產(chǎn)生的外電場(chǎng)中(電極板外接高壓穩(wěn)態(tài)直流電源)。在外電場(chǎng)的作用下(外接電源分別在200v、400v、600v、800v、1000v的狀態(tài)下進(jìn)行實(shí)驗(yàn))骨試件會(huì)發(fā)生彎曲變形,即骨的力電性質(zhì)。利用高倍數(shù)字光學(xué)顯微鏡以及數(shù)字圖像處理技術(shù)觀測(cè)和計(jì)算骨試件自由端的位移。研究骨逆壓電效應(yīng)的各種性質(zhì)。 通過實(shí)驗(yàn)發(fā)現(xiàn):同一試件,隨著電壓的減小,試件位移逐漸減小。不同試件之間,相同電壓作用下,試件位移雖然不同,但是隨著電壓的變化,其位移大小的變化趨勢(shì)是一樣的。同一試件,隨著厚度的減小,在相同電壓下試件位移變大。在外電場(chǎng)作用下不同試件之間,隨著厚度的變化(電壓相同)位移大小不同,但趨勢(shì)相同。不同的試件在相同厚度的情況下,相同外電壓作用下,位移大小不同,有的相差很大。 同時(shí)實(shí)驗(yàn)研究了產(chǎn)生外電場(chǎng)的電極板在一端接地的情況下試件位移的大小及其它性質(zhì)。采用4種加載電場(chǎng)的方式進(jìn)行測(cè)試,第1、2種加載方式以及第3、4種加載方式分別為不改變接地的電極而是通過電源輸出電壓的極性改變電場(chǎng)方向,然而前兩種加載方式與后兩種加載方式接地的極板方向不同,第1、2種加載方式右側(cè)極板接地,第3、4種加載方式左側(cè)極板接地。在通過改變電源輸出電壓的極性來改變電場(chǎng)方向的情況下,牛骨薄梁試樣在外電場(chǎng)作用下位移的方向沒有發(fā)生變化,且大小幾乎相同。而在通過儀器自身的改變(改變接地極板的方向)來改變電場(chǎng)方向的情況下,牛骨薄梁試樣在外電場(chǎng)作用下位移的方向會(huì)發(fā)生變化,正向位移大小要大于負(fù)向位移的大小,這種現(xiàn)象隨著外接電壓的增加以及牛骨試件厚度的減小而越發(fā)明顯。
[Abstract]:Bone is an anisotropic material with piezoelectric properties, but its piezoelectric properties are very complicated because of the complex microstructure of bone. Because of the effect of stress in bone, electrical signals may affect the growth of bone cells, so it is very important to study the piezoelectric effect of bone. However, it is not enough to study the positive piezoelectric effect of bone. Therefore, we also need to explore the inverse piezoelectric effect of bone. In this paper, the displacement of bending deformation of bovine bone thin beam specimen with inverse piezoelectric effect has been measured. Seven bovine bone specimens were tested under the condition of 0. 3 mm (50 mm in height and 10 mm in width) with a thickness of 0. 6 mm and 0. 5 mm. The bovine bone specimen is placed in an external electric field generated by two electrodes (the electrode plate is externally connected to a high voltage steady-state DC power supply). Under the action of an external electric field (the external power supply is tested at the condition of 200v / 400v / 600V / 100V respectively), the bone specimen will bend and deform, that is, the mechanical and electrical properties of the bone. The displacement of free end of bone specimen was observed and calculated by high power digital optical microscope and digital image processing technology. The properties of inverse piezoelectric effect of bone were studied. It is found that the displacement of the same specimen decreases with the decrease of voltage. The displacement of different specimens is different under the same voltage, but the change trend of displacement is the same with the change of voltage. With the thickness decreasing, the displacement of the same specimen increases at the same voltage. Under the action of external electric field, the displacement of different specimens varies with the change of thickness (same voltage), but the trend is the same. Under the same thickness and the same external voltage, the displacement of different specimens varies greatly. At the same time, the displacement and other properties of the electrode plate with external electric field are studied under the condition of earthing at one end. Four ways of loading electric field were used to test. The first two loading modes and the third four loading modes changed the electric field direction by the polarity of the output voltage instead of changing the grounding electrode, respectively. However, the first two loading modes are different from the latter two ways in the direction of the earthing plate, the first and the second loading modes are the right side polar plate grounding, and the third one is the fourth loading mode, the left pole plate is grounded. When the direction of electric field is changed by changing the polarity of the output voltage of the power supply, the direction of displacement of the specimen of the thin beam of bovine bone does not change under the action of the external electric field, and the magnitude is almost the same. In the case of changing the direction of the electric field by changing the instrument itself (changing the direction of the electrode plate), the direction of the displacement of the specimen of the thin beam of bovine bone will change under the action of the external electric field, and the magnitude of the forward displacement is larger than the magnitude of the negative displacement. This phenomenon becomes more and more obvious with the increase of the external voltage and the decrease of the thickness of the bovine bone specimen.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：O482.41;R312

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