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Manufacturing of Porous Polydimethylsiloxane (PDMS) Plates Using Solvent Evaporation Induced Phase Separation Technique 溶剂蒸发诱导相分离技术制备多孔聚二甲基硅氧烷(PDMS)板
M. Abshirini, M. Altan, Yingtao Liu, M. Saha, L. Cummings, T. Robison
This paper presents the fabrication and characterization of porous polydimethylsiloxane (PDMS) plates. The framework for obtaining porous PDMS is based on the solvent evaporation induced phase separation technique. A mixture of PDMS, water, and tetrahydrofuran (THF) with different concentrations is prepared. The three phases are stirred to reach a highly stable and viscous solution. The THF and water phases are evaporated during a curing cycle by applying a stepping heat treatment. The porous PDMS sheets with a wide range of pore sizes are fabricated by controlling the ratio of water to THF in the mixture. The confocal microscopy images are used to characterize the average pore size and the pore size distribution in the structures. Dogbone samples following the ASTM standard D412 are cut from the porous plates by utilizing a designed cutting die and mechanical press. The specimens are tested under tensile loading to evaluate the effect of the pore size on the mechanical properties of the porous structure. The results demonstrate the ability of the proposed solvent evaporation method to control the stiffness of the porous structure by changing the non-solvent to the solvent ratio in the mixture.
本文介绍了多孔聚二甲基硅氧烷(PDMS)板的制备和表征。制备多孔PDMS的框架是基于溶剂蒸发诱导相分离技术。制备了不同浓度的PDMS、水和四氢呋喃(THF)的混合物。这三个阶段被搅拌,以达到高度稳定和粘性的溶液。THF和水相在固化循环中通过应用步进热处理蒸发。通过控制混合物中水与四氢呋喃的比例,制备了具有宽孔径范围的多孔PDMS片材。用共聚焦显微镜图像表征了结构的平均孔径和孔径分布。使用设计的切割模具和机械压力机从多孔板上切割出遵循ASTM标准D412的犬骨样品。在拉伸载荷作用下对试样进行试验,以评价孔隙尺寸对多孔结构力学性能的影响。结果表明,溶剂蒸发法可以通过改变混合物中非溶剂与溶剂的比例来控制多孔结构的刚度。
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引用次数: 0
Blue Shift in Ultraviolet Absorption Spectra of Oxygen Doped Titanium Nitride Thin Films 氧掺杂氮化钛薄膜紫外吸收光谱的蓝移
M. Roy, Dhananjay Kumar
The objective of this study is to investigate the effect of film thickness on the bandgap of oxygen (O2)-doped titanium nitride (TiN) thin films. To accomplish this, high-quality two-dimensional O2-doped TiN films have been prepared on single-crystal sapphire substrates using a pulsed laser deposition method. The film thicknesses were varied from 3 to 100 nm by varying the number of laser pulses, while other deposition parameters are kept constant. X-ray diffraction (XRD) patterns have shown that the films grow in (111) orientation on the sapphire substrate. The increase in the intensity of the XRD (111) peak also demonstrates a better orientational alignment of the TiN films with substrate as the film thickness increases. The x-ray rocking curve has been used to measure the full width half maxima (FWHM) for each film. The FWHM values has been found to vary from 0.07 to 0.2° as the film thickness decreases. This is taken to indicate that the grain size decreases with a decrease in film thickness. Ultraviolet visible spectroscopy measurements in the wavelength range (200–800 nm) have been performed as well, which indicates an increase in the bandgap of O2-doped TiN films with a decrease in film thickness. The decrease in the film thickness leads to a blue shift of the peak in the ultraviolet-visible absorption (UV-A) region; this blueshift is accompanied by an increase in the bandgap of O2-doped TiN from 3.2 to 3.8 eV. The change in the bandgap due to a change in film thickness has been explained using the quantum confinement effect.
本研究的目的是研究薄膜厚度对氧掺杂氮化钛(TiN)薄膜带隙的影响。为了实现这一目标,使用脉冲激光沉积方法在单晶蓝宝石衬底上制备了高质量的二维o2掺杂TiN薄膜。在其他沉积参数保持不变的情况下,通过改变激光脉冲数使薄膜厚度在3 ~ 100 nm之间变化。x射线衍射(XRD)结果表明,薄膜在蓝宝石衬底上呈(111)取向生长。XRD(111)峰强度的增加也表明随着薄膜厚度的增加,TiN薄膜与衬底的取向排列更好。x射线摇摆曲线被用来测量每个薄膜的全宽半最大值(FWHM)。随着膜厚的减小,FWHM值在0.07 ~ 0.2°之间变化。这表明晶粒尺寸随着薄膜厚度的减小而减小。在波长范围内(200 ~ 800 nm)进行了紫外可见光谱测量,结果表明o2掺杂TiN薄膜的带隙随着膜厚度的减小而增大。薄膜厚度的减小导致紫外-可见吸收区(UV-A)峰蓝移;这种蓝移伴随着o2掺杂TiN的带隙从3.2 eV增加到3.8 eV。由于薄膜厚度的变化而引起的带隙的变化已经用量子约束效应解释了。
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引用次数: 0
Evaluation of Fatigue Crack Growth Characteristics on Stainless Steel SS 316 LN Using Acoustic Emission Technique 声发射技术评价不锈钢ss316ln疲劳裂纹扩展特性
R. Prakash, M. Thomas
Results of online acoustic emission (AE) monitoring during fatigue crack growth rate (FCGR) experiments on a stainless steel SS 316 LN are presented in this paper. Two specimen geometries — viz., standard compact tension (C(T)) specimens as well as side-grooved C(T) specimens were considered for experiments at ambient temperature and at 600°C (873K). There is a good correspondence between crack length increment and the increase in AE cumulative count and cumulative energy during the experiments. The side grove introduced on the thickness direction of the test specimen constrains the plastic zone ahead of the crack tip, thereby enforcing plane strain conditions at the crack. Reduced AE activity at initial stages of crack growth was observed for side grooved samples. The transition to Stage-II crack growth was observed using acoustic emission (AE) technique which otherwise was not visible from the fatigue crack growth plot. The work further attempts to correlate the AE parameters obtained during elevated temperature (873K) fatigue crack growth in stainless steel. For the purpose of acquiring AE signals outside the heated zone, a waveguide was used to transmit the acoustic waves from the specimen at high temperature. A correlation between crack advance and AE parameters was obtained from the elevated temperature tests.
本文介绍了不锈钢ss316ln疲劳裂纹扩展速率在线声发射监测结果。在环境温度和600°C (873K)下的实验中,考虑了两种试样几何形状-即标准紧绷(C(T))试样和侧槽C(T)试样。实验过程中,裂纹长度增量与声发射累计次数和累积能量的增加有较好的对应关系。在试件厚度方向上引入的侧凹槽约束了裂纹尖端前方的塑性区,从而加强了裂纹处的平面应变条件。侧槽试样裂纹扩展初期声发射活性降低。利用声发射(AE)技术观察了向ii阶段裂纹扩展的过渡,否则在疲劳裂纹扩展图中无法看到。该工作进一步尝试将不锈钢在高温(873K)疲劳裂纹扩展过程中获得的声发射参数联系起来。为了获取受热区外的声发射信号,采用波导传输高温下试样的声波。通过高温试验,得到了裂纹扩展与声发射参数的相关关系。
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引用次数: 0
Nano-Scale Wettability of Free-Standing Capped Carbon Nanotube Arrays 独立帽状碳纳米管阵列的纳米尺度润湿性
Miray Ouzounian, Travis Shihao Hu
Countless organisms in nature have adapted high-aspect-ratio micro-/nano-fibrillar arrays on their functional surfaces for achieving special and often optimized functionalities using earthly abundant materials. At the core of nanoscience and nanotechnology, rationally mimicking nature offers a promising route to create multifunctional superstructures that capture organisms and biological materials’ intriguing responsive and self-adjusting properties. Prior work has demonstrated that hierarchical vertically aligned multi-walled carbon nanotube (VA-MCNT) arrays can achieve ten folds of adhesive force comparing to the fibrillar structures of the gecko toe pads. However, little is known with regard to their wettability at the ultimate atomistic level, and how this may influence the adhesive performance and/or self-cleaning capabilities, despite water condensation and bridging are common phenomena at this length scale. In present study, molecular dynamics (MD) simulations were performed using Large-Scale Atomic / Molecular Massively Parallel Simulator (LAMMPS). Results indicate that commonly believed hydrophobic defect free CNTs (i.e., carbon sp2 hybridization without any dangling bonds) become super-hydrophilic at this length/temporal scale. The critical factors that influence the number of H-Bonds in water are: i) tube-tube spacing; and ii) shape/size and position of the water nanodroplet; and iii) how many droplets exists and how many nanotubes are bridged by the droplets. Chirality has little effect on the water interfacial behaviors. Future work will focus on the effect of water condensation and bridging on the adhesive and self-cleaning properties of carbon-based bio-inspired fibrillar dry adhesives considering defects and saline water.
自然界中无数的生物已经在它们的功能表面上采用了高纵横比的微/纳米纤维阵列,以利用地球上丰富的材料实现特殊的、通常是优化的功能。在纳米科学和纳米技术的核心,合理地模仿自然为创造多功能上层结构提供了一条有希望的途径,这些上层结构可以捕捉生物体和生物材料的有趣的响应和自我调节特性。先前的研究表明,与壁虎趾垫的纤维结构相比,分层垂直排列的多壁碳纳米管(VA-MCNT)阵列可以获得十倍的粘附力。然而,关于它们在最终原子水平上的润湿性,以及这可能如何影响粘合剂性能和/或自清洁能力,知之甚少,尽管水凝结和桥接是这种长度尺度上的常见现象。本研究采用大规模原子/分子大规模并行模拟器(LAMMPS)进行分子动力学模拟。结果表明,通常认为无疏水缺陷的碳纳米管(即没有悬空键的碳sp2杂化)在这个长度/时间尺度上变得超亲水。影响水中氢键数目的关键因素有:1)管间距;(ii)纳米水滴的形状/大小和位置;iii)有多少液滴存在,有多少纳米管被液滴桥接。手性对水界面行为影响不大。未来的工作将集中在考虑缺陷和盐水的情况下,研究水的凝结和桥接对碳基仿生纤维干胶的粘接和自清洁性能的影响。
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引用次数: 0
Effect of Friction on Residual Stress Distribution Induced by Split Sleeve Cold Expansion Process 摩擦对裂套冷胀过程残余应力分布的影响
Mithu Dey, Dave Kim, H. Tan
Residual Stress distribution and parametric influence of friction are studied for the split sleeve cold expanded holes in Al 2024 T351 alloy, by developing a three-dimensional finite element model of the process. Fastener holes in the alloy are necessary for the manufacturing process, but they create a potential area for stress concentration, which eventually leads to fatigue under cyclic loading. Beneficial compressive residual stress distribution as a result of the split sleeve cold expansion process provides retardation against crack initiation and propagation at the critical zones near hole edges. In this parametric study, the influence of friction between contact surfaces of the split sleeve and mandrel is numerically investigated. Hole reaming process after split sleeve cold expansion is often not discussed. Without this post-processing procedure, split sleeve cold expansion is incomplete in practice, and its purpose of providing better fatigue performance is invalidated. This study presents results and an overview of the significance of friction with the consideration of the postprocessing of split sleeve cold expansion. The numerical results show that with increasing friction coefficient, compressive residual stress reduces significantly at the mandrel entry side, which makes the hole edge more vulnerable to fatigue. The different aspects of finite element modeling approaches are also discussed to present the accuracy of the prediction. Experimental residual stress observation or visual validation is expensive and time-consuming. So better numerical prediction with the transparency of the analysis design can provide critical information on the process.
通过建立三维有限元模型,研究了Al 2024 T351合金裂套冷扩孔残余应力分布及摩擦参数的影响。合金中的紧固件孔在制造过程中是必需的,但它们会产生潜在的应力集中区域,最终导致循环载荷下的疲劳。由于裂套冷膨胀过程产生的有利的残余压应力分布在孔边缘附近的临界区域阻滞了裂纹的萌生和扩展。在参数化研究中,数值研究了劈裂套与芯轴接触面间摩擦力的影响。劈裂套筒冷胀后的扩孔工艺往往不被讨论。如果没有这一后处理程序,裂套冷胀在实际应用中是不完整的,其提供更好疲劳性能的目的也就失效了。本研究提出了结果,并概述了考虑裂套冷膨胀后处理的摩擦的意义。数值结果表明,随着摩擦系数的增大,心轴入口侧残余压应力显著减小,使孔边缘更容易发生疲劳;本文还讨论了有限元建模方法的不同方面,以说明预测的准确性。实验残余应力观察或视觉验证既昂贵又耗时。因此,更好的数值预测与分析设计的透明度可以提供关键信息的过程。
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引用次数: 1
Development of a Strain-Controlled Graphene-Based Highly Sensitive Gas Sensor 应变控制石墨烯型高灵敏度气体传感器的研制
Xiangyu Qiao, Qinqiang Zhang, Ken Suzuki
Small-size wearable multi-gas sensor with high selectivity and sensitivity is demanded for detecting various harmful gases with high sensitivity in chemical plants, various mines, volcanos, oil and gas fields. Graphene is considered to be the most promising gas-sensitive material due to its large specific surface area and high electron mobility. Many studies have shown that it has a high sensitivity to many gases such as NH3, CO, NO2, H2O, and so on. However, the lack of gas selectivity limits the further application of graphene to gas sensing field. In this study, a first-principle calculation was used to investigate the effect of strain on the gas adsorption behavior of graphene. As a result, it was found that the adsorption behavior of H2O and CO molecules was changed by strain. The adsorption energy of both gases increased monotonically with strain. For carbon monoxide molecules, desorption occurred when the applied tensile strain reached about 5%. These analytical results clearly indicated that there is a possibility of the high selectivity of plural gases by applying appropriate critical strain at which its adsorption changes to desorption. To verify this result, the strain-controlled sensor using graphene was developed. The sensor is composed of graphene and electrodes mounted on a deformable substrate. The high-quality graphene is synthesized on copper by LPCVD (low pressure chemical vapor deposition), and then transferred to the PDMS (Polydimethylsiloxane) substrate using PMMA (Poly methyl methacrylate) as a support layer. It was found that the graphene was monolayer and successfully transferred to the target substrate. The effect of strain on the adsorption of some gases was validated by measuring the change of the resistivity of graphene under the application of uniaxial strain.
化工厂、各种矿山、火山、油气田等需要高灵敏度检测各种有害气体,需要小尺寸、高选择性、高灵敏度的可穿戴式多气体传感器。石墨烯由于其大的比表面积和高的电子迁移率被认为是最有前途的气敏材料。许多研究表明,它对许多气体如NH3、CO、NO2、H2O等都有很高的灵敏度。然而,缺乏气体选择性限制了石墨烯在气敏领域的进一步应用。在本研究中,采用第一性原理计算来研究应变对石墨烯气体吸附行为的影响。结果发现,应变改变了H2O和CO分子的吸附行为。两种气体的吸附能随应变单调增加。对于一氧化碳分子,当施加的拉伸应变达到约5%时发生解吸。这些分析结果清楚地表明,施加适当的临界应变,使其吸附转变为脱附,就有可能使多种气体具有高选择性。为了验证这一结果,开发了石墨烯应变控制传感器。该传感器由石墨烯和安装在可变形基板上的电极组成。采用LPCVD(低压化学气相沉积)技术在铜上合成了高质量的石墨烯,然后以PMMA(聚甲基丙烯酸甲酯)作为支撑层转移到PDMS(聚二甲基硅氧烷)衬底上。发现石墨烯是单层的,并成功地转移到目标衬底上。通过测量单轴应变作用下石墨烯电阻率的变化,验证了应变对某些气体吸附的影响。
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引用次数: 2
Effects of Defects on Nanoporous Graphene and MoS2 纳米多孔石墨烯和二硫化钼缺陷的影响
P. Oviroh, Lesego Mohlala, T. Jen
Nanoporous 2D materials such as grapheme and MoS2 promises better filtrations in water channels. However certain parameters that affects these materials for effective deployment need to be studied. In this paper, molecular dynamics (MD) simulation was performed to study the effects of defects that could increase the prospect of tuning the efficiency of the materials in the transportation, catalysis and mechanical reaction efficiency. Consideration of the interfaces between them could lead to improved functionalities of the materials. This paper systematically compares MoS2 and graphene membranes to highlight specific features and benefits. the Young’s modulus of the pristine monolayer MoS2 was calculated to be 447GPa while that of the defective MoS2 was found to be in the range of (314–374) GPa. The Young’s Modulus for Graphene was 783.2 GPa. The relative variation of the Young’s modulus on MoS2 is in the range (13–35) % while that of graphene is (13–21) %. From the results obtained, the maximum pressure that the MoS2 can withstand depends not just on the spacing and size of the nanopores, but also on the area of the defects in the membrane. These findings could help build and proliferate tunable filtration nanodevices and other applications.
石墨烯和二硫化钼等纳米多孔二维材料有望在水渠中获得更好的过滤效果。然而,需要研究影响这些材料有效部署的某些参数。本文通过分子动力学(MD)模拟研究了缺陷对材料在运输、催化和机械反应效率方面的影响,从而增加了调节材料效率的前景。考虑它们之间的接口可以改善材料的功能。本文系统地比较了MoS2和石墨烯膜的特点和优点。原始单层MoS2的杨氏模量为447GPa,而缺陷单层MoS2的杨氏模量为(314 ~ 374)GPa。石墨烯的杨氏模量为783.2 GPa。二硫化钼的杨氏模量的相对变化范围为(13 ~ 35)%,石墨烯的相对变化范围为(13 ~ 21)%。从得到的结果来看,二硫化钼所能承受的最大压力不仅取决于纳米孔的间距和大小,还取决于膜中缺陷的面积。这些发现可能有助于构建和扩展可调谐过滤纳米器件和其他应用。
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引用次数: 0
An Investigation on Flexural Fatigue Behavior of CFRP Quasi-Isotropic Laminates CFRP准各向同性层合板弯曲疲劳性能研究
K. Panbarasu, V. Ranganath, R. Prakash
In this study, AS4/914 grade carbon fibre reinforced plastic (CFRP) laminates with two different quasi-isotropic (QI) layup sequences are compared for their performance under four point bend flexure fatigue loads. The QI laminates were designated and fabricated as Laminate-1 (L1) [0/45/-45/90]2S and Laminate-2 (L2) [0/90/45/-45]2S, respectively. These laminates were designed, such that the 0° layers are placed at a similar position in both the laminate systems by changing the other layers. During the test, load and displacement data was monitored online along with instantaneous number of constant load amplitude (CLA) fatigue cycles to calculate the stiffness degradation. Three load levels of 90%, 80%, and 70% of the ultimate flexure strength (UFS) were chosen for assessing the flexure fatigue behavior of the laminates. A few tests were also attempted under variable amplitude loads: (i) high amplitude cycles followed by low amplitude and (ii) low amplitude cycles followed by high amplitude to examine load sequence effect on fatigue life, if any, as compared to the fatigue life under CLA. It has been observed that the laminate L1 performs better under higher amplitudes, while the laminate L2 shows increased life under lower load and variable amplitudes. The results obtained in the form of data plots and failure modes, supported by microscopic images, are discussed in the paper.
在这项研究中,比较了两种不同的准各向同性(QI)铺层顺序的AS4/914级碳纤维增强塑料(CFRP)层压板在四点弯曲弯曲疲劳载荷下的性能。QI层压板分别被命名为Laminate-1 (L1) [0/45/-45/90]2S和Laminate-2 (L2) [0/90/45/-45]2S。这些层压板经过设计,使得通过改变其他层,0°层在两个层压板系统中放置在相似的位置。在试验过程中,在线监测载荷和位移数据以及恒载荷幅值(CLA)疲劳循环的瞬时次数,以计算刚度退化。选择90%、80%和70%的极限抗弯强度(UFS)三种载荷水平来评估层压板的抗弯疲劳行为。在可变振幅载荷下还尝试了一些试验:(i)高振幅循环后是低振幅,(ii)低振幅循环后是高振幅,以检查载荷顺序对疲劳寿命的影响,如果有的话,与CLA下的疲劳寿命相比。结果表明,层压板L1在高振幅下的性能更好,而层压板L2在低载荷和可变振幅下的寿命更长。本文讨论了以数据图和失效模式形式得到的结果,并辅以显微图像。
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引用次数: 1
Nanoscale Interphase Characterization of Porous CNT Buckypaper Composites in Correlation to Interlaminar Mode I Fracture 多孔碳纳米管纸复合材料层间I型断裂的纳米级界面表征
M. Y. Fard, Jack Mester, A. Pensky
In this conference paper, nanoscale material property data and ASTM mode I interlaminar fracture results for three-phase buckypaper samples are presented and analyzed. Vacuum filtration and surfactant-free methods were used to manufacture buckypaper membranes. Epoxy infused buckypaper membranes were placed in front of the crack tip in a stitch bonded carbon fiber polymer matrix composite. Peak Force Quantitative Nanomechanical Mapping (PFQNM), using probes with nominal tip radius in the range of 5–8 nm were used. PFQNM characterized the interphase region between a three-phase sample of carbon monofilament, epoxy resin, and multi-walled carbon nanotube (MWCNT) buckypaper. This experiment captured reproducible nanoscale morphological, viscoelastic, elastic and energy properties of porous MWCNT buckypaper samples. An enlarged interphase region surrounding the CNT buckypaper was found. The buckypaper and epoxy interphase thickness was found to be 50nm, higher than the 10–40nm reported for epoxy and carbon monofilaments. The observed MWCNT structure provides explanation of the increased surface roughness compared to the smooth carbon monofilaments. The increased surface roughness likely improves mechanical interlocking with the epoxy of adjacent lamina. The nanoscale interphase and subsurface characterization data provide explanation for a change in crack propagation toughness. Buckypaper exhibited inhomogeneous properties at micrometer length scales.
在这篇会议论文中,介绍和分析了纳米尺度材料性能数据和ASTM模式I三相巴克纸样品的层间断裂结果。采用真空过滤法和无表面活性剂法制备了纸膜。将注入环氧树脂的巴克纸膜置于缝接碳纤维聚合物基复合材料的裂纹尖端前。峰值力定量纳米力学制图(PFQNM),使用探针,标称尖端半径在5-8 nm范围内。PFQNM表征了碳单丝、环氧树脂和多壁碳纳米管(MWCNT)纸三相样品之间的相间区。本实验捕获了多孔MWCNT巴克纸样品的可重现的纳米尺度形态、粘弹性、弹性和能量特性。在碳纳米管纸周围发现一个扩大的相间区。纸和环氧树脂的界面厚度为50nm,高于环氧树脂和碳单丝的10-40nm。观察到的MWCNT结构提供了与光滑的碳单丝相比表面粗糙度增加的解释。增加的表面粗糙度可能会改善与相邻层的环氧树脂的机械联锁。纳米级界面和亚表面表征数据为裂纹扩展韧性的变化提供了解释。巴克纸在微米尺度上表现出不均匀性。
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引用次数: 0
Piezoelectric Performance of PVDF Composites for Transportation Engineering: A Multi-Scale Simulation Study 运输工程用PVDF复合材料压电性能的多尺度模拟研究
Xiao-Hong Yin, Jin Jian, Can Yang, T. Lei, Tao Cheng
In the present work, the poly (vinylidene fluoride) composite filled with the lead zirconium titanate (PVDF/PZT) was numerically investigated focusing on the improvement of piezoelectric performance parameters. With a multi-scale simulation strategy, effects of the PZT fillers’ orientation and length on the electrical outputs of the piezoelectric energy collectors buried in the roads were systematically examined. Specifically, at the micro-scale, based on our previous research results, Comsol Multiphysics connected with Matlab was utilized to create the unit cell of piezoelectric composites. The simulation results showed that parameters of PZT nano-fillers greatly affect the piezoelectric coefficients. For the macro-scale simulation, a road energy collector with innovative symmetrical cantilever structure was designed, with piezoelectric constants obtained at micro-scale simulation as inputs. The correlation between the output voltage of the energy-collector and PZT parameters (i.e., orientation and length) was successfully developed by applying the vehicle’s axle-load. This work provides a way for tailoring the piezoelectric performance of the macro components (i.e., sensors) through adjusting the states of the fillers inside the piezoelectric composites.
本文对钛酸锆铅填充聚偏氟乙烯复合材料(PVDF/PZT)进行了数值研究,重点研究了其压电性能参数的改善。采用多尺度仿真策略,系统研究了埋地压电集能器的方向和长度对集能器输出电流的影响。具体而言,在微观尺度上,在前人研究成果的基础上,利用Comsol Multiphysics结合Matlab构建压电复合材料的单元胞。仿真结果表明,PZT纳米填料的参数对压电系数有很大影响。在宏观模拟中,以微尺度模拟得到的压电常数为输入,设计了一种创新的对称悬臂结构道路能量集热器。通过施加车辆的轴载,成功地开发了能量收集器的输出电压与PZT参数(即方向和长度)之间的相关性。这项工作提供了一种通过调整压电复合材料内部填料的状态来定制宏观组件(即传感器)的压电性能的方法。
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引用次数: 0
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