【摘要】：柔性薄膜材料在生物醫(yī)學和電子工程等領(lǐng)域有著廣泛地應用,然而在實際應用中,柔性薄膜材料經(jīng)常會因本身界面結(jié)合強度、抗拉強度等力學性能不足,造成薄膜的斷裂和剝離等失效現(xiàn)象。由于柔性薄膜材料的力學性能好壞直接關(guān)系到元件的可靠性、穩(wěn)定性及壽命,因此,為了提升柔性薄膜材料元器件的使用性能而研究柔性薄膜材料的力學性能有著重要的意義。鼓包法是可以測量柔性薄膜材料彈性模量和界面結(jié)合強度等力學參數(shù)的實驗方法。數(shù)字散斑的優(yōu)點在于可以不和測量物體接觸就可以測出物體的變形,具有精度高,并可以給出視野范圍內(nèi)的全場變形等優(yōu)點。本文將數(shù)字散斑方法和鼓包法結(jié)合起來,研究了萘鈉處理劑對PVDF柔性薄膜材料彈性模量的影響,以及硬質(zhì)薄膜/柔性基底結(jié)構(gòu)的界面剪切強度。主要研究內(nèi)容及結(jié)果如下:(1)采用數(shù)字散斑方法研究了萘鈉處理劑對PVDF薄膜力學性能的影響。在鼓包測量儀上,安裝固定好實驗薄膜,利用步進電機驅(qū)動油壓缸將油壓施加在樣品薄膜上使其發(fā)生鼓包變形,利用數(shù)字散斑技術(shù)記錄下變形過程,根據(jù)相關(guān)公式計算出PVDF薄膜的彈性模量分布在2.27~2.61 GPa之間,實驗結(jié)果表明萘鈉處理劑對PVDF薄膜的彈性模量并無顯著影響。(2)采用數(shù)字散斑方法對銅/聚偏氟乙烯(PVDF)基底柔性層狀復合薄膜的界面剪切強度進行了研究。首先將PVDF薄膜粘結(jié)在有中心孔的鋼制基座上并完全覆蓋中心通油孔,之后將制作好的銅薄膜采用環(huán)氧樹脂慢干膠粘結(jié)在PVDF薄膜表面,最后將制成的實驗樣品安放在鼓包測量儀上進行實驗。在PVDF基底上施加均勻油壓直到層狀結(jié)構(gòu)界面發(fā)生破壞。用這種方法,計算出的剪切強度穩(wěn)定分布在40.9-53.2 kPa之間。(3)采用Abaqus有限元軟件建立了二維條件下的硬質(zhì)薄膜/柔性基底結(jié)構(gòu)的有限元模型,分析了模型中應變分布和發(fā)生破壞時界面處應變變化。計算結(jié)果表明,由于硬質(zhì)薄膜的阻礙作用,使柔軟基底的水平拉伸變形區(qū)域縮小,并集中于加壓區(qū)域的邊緣。柔性薄膜在剪切面位置發(fā)生了壓縮變形,正是這種壓縮變形和硬質(zhì)薄膜剪切面處的拉伸變形相互作用,使得當壓強升高為1800 kPa時剪切面發(fā)生破壞,并產(chǎn)生較大的離面位移。本論文利用數(shù)字散斑技術(shù)對柔性薄膜材料的力學性能進行了研究。實驗結(jié)果表明數(shù)字散斑技術(shù)可以有效地測量PVDF薄膜材料的彈性模量和銅/聚偏氟乙烯(PVDF)基底柔性層狀復合薄膜的界面剪切強度。
[Abstract]:Flexible thin film materials are widely used in biomedicine and electronic engineering. However, in practical applications, flexible thin film materials often lack of mechanical properties such as interfacial bonding strength and tensile strength. The failure phenomena such as fracture and peeling of thin films are caused. Because the mechanical properties of flexible thin film materials are directly related to the reliability, stability and life of the components, it is of great significance to study the mechanical properties of flexible thin film materials in order to improve the service performance of flexible thin film materials. Drum cladding method is an experimental method for measuring mechanical parameters such as elastic modulus and interfacial bonding strength of flexible film materials. The advantage of the digital speckle is that it can measure the deformation of the object without contact with the measured object. It has the advantages of high precision and can give the whole field deformation in the field of view and so on. In this paper, the effect of sodium naphthalene treatment on the elastic modulus of PVDF flexible thin film and the interfacial shear strength of rigid film / flexible substrate structure were studied by combining digital speckle method with drum method. The main contents and results are as follows: (1) the effect of sodium naphthalene treatment agent on the mechanical properties of PVDF thin films was studied by digital speckle method. On the drum measuring instrument, the fixed experimental film is installed, and the oil pressure is applied to the sample film by the step motor drive oil cylinder. The deformation process is recorded by the digital speckle technique, and the deformation process is recorded by the digital speckle technique, and the deformation process is recorded by the digital speckle technique. The elastic modulus distribution of PVDF thin films is calculated to be between 2.27 GPa and 2.61 GPa. The experimental results show that sodium naphthalene has no significant effect on the elastic modulus of PVDF films. (2) the interfacial shear strength of copper / polyvinylidene fluoride (PVDF) thin films is studied by digital speckle method. First, the PVDF film is bonded to the steel base with the center hole and completely covered with the central oil hole, then the copper film is bonded to the surface of the PVDF film with epoxy resin slow-drying adhesive, and then the copper film is bonded to the surface of the PVDF film by epoxy resin slow-drying adhesive. Finally, the experimental samples were placed on the drum measuring instrument to carry on the experiment. The uniform oil pressure was applied on the PVDF substrate until the interface of the layered structure was destroyed. Using this method, the stable distribution of shear strength is between 40.9 and 53.2 kPa. (3) the finite element model of rigid film / flexible substrate structure under two-dimensional conditions is established by using Abaqus finite element software. The strain distribution in the model and the strain change at the interface during failure are analyzed. The results show that the horizontal tensile deformation region of the soft substrate is reduced due to the hindrance of the rigid film, and it is concentrated on the edge of the compression region. The compression deformation of the flexible film occurs at the shear plane. It is the interaction between the compression deformation and the tensile deformation at the shear plane of the rigid film, which results in the failure of the shear plane and the large off-plane displacement when the pressure increases to 1800 kPa. In this paper, the mechanical properties of flexible thin film materials were studied by digital speckle technique. The experimental results show that the digital speckle technique can effectively measure the elastic modulus of PVDF thin films and the interfacial shear strength of copper / polyvinylidene fluoride (PVDF) thin films.
【學位授予單位】：湘潭大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB383.2

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