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Artykuły w czasopismach na temat "Single Material SPR"
1
He, Xiao Cong. "Sheet Material Property Effects upon Dynamic Behavior in Self-Pierce Riveted Joints." Materials Science Forum 675-677 (February 2011): 999–1002. http://dx.doi.org/10.4028/www.scientific.net/msf.675-677.999.
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Self-pierce riveting (SPR) technology offers an alternative to resistance spot welding (RSW) for joining sheet materials. It has been found that the SPR technology produced a much stronger joint than the RSW in fatigue test. For efficient design of SPR structures, the knowledge of dynamic characteristics of the SPR beams is essential. In this paper, the free transverse vibration characteristics of single lap-jointed cantilevered SPR beams are investigated in detail. The focus of the analysis is to reveal the influence on the natural frequency and natural frequency ratio of these beams caused by variations in the material properties of sheet materials to be jointed. It is shown that the transverse natural frequencies of single lap jointed cantilevered SPR beams increase significantly as the Young’s modulus of the sheet materials increases, but change slightly corresponding to the change in Poisson’s ratio. It is also found that the material density of the sheets have significant effects on the free transverse vibration characteristics of the beams.
2
Dorozinska, H. V. "INFLUENCE MATERIAL OF PRISM ON THE SENSITIVITY OF SPR SENSORS." Optoelektronìka ta napìvprovìdnikova tehnìka 55 (December 31, 2020): 179–85. http://dx.doi.org/10.15407/iopt.2020.55.179.
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Theoretical analysis of the influence of the sensor prism material on the basis of the phenomenon of surface plasmon resonance (SPR) on its sensitivity and temperature stability of the measurement result is carried out. The analysis was performed for the infrared wavelength range of excitation surface plasmon radiation (980... 1550 nm) using materials for prisms with different refractive indices, namely: glass ceramics Zerodur (n D = 1,5423), optical glasses N-FK51A (n D = 1, 4865) and N-BK7 (n D = 1,5167) with low refractive index, single crystal material CaF 2 (n D = 1.4339), as well as flints N-SF2 (n D = 1,6475) and N-SF11 (n D = 1,7845). The temperature stability of the measurement result was determined for the temperature range from 20 °C to 70 °C, which corresponds to the operating temperature range of most refractometers and commercial SPR sensors. The coefficient of temperature shift of the minimum reflection characteristic for the investigated materials was calculated as the ratio of the magnitude of the angular shift ∆θ to the corresponding change of temperature ∆Т, which caused this shift. The results of the study showed that for all materials, regardless of the refractive index value, the temperature effect decreases with increasing wavelength of radiation. For the material with a lower refractive index (CaF 2 ), the temperature coefficient was 2 times higher than for flint glass (N-SF11). According to the results of the analysis, it was found that the sensitivity of the SPR sensor increases threefold from 52.83 deg./RIU to 173.16 deg./RIU when the refractive index of the prism changes from n D = 1.79 to n D = 1.43. It was also found that increasing the wavelength of the radiation increased both the sensitivity of the SPR sensor and temperature stability regardless of the prism material. The results of the study can be used both to develop new SPR sensors and to optimize the modes of operation of existing ones, in particular the choice of optimal sensitivity at a given range of measurement of the refractive index of the test substance.
3
Liu, Chunlan, Yang Gao, YaChen Gao, Yong Wei, Ping Wu, and Yudong Su. "Enhanced sensitivity of fiber SPR sensor by metal nanoparticle." Sensor Review 40, no. 3 (2020): 355–61. http://dx.doi.org/10.1108/sr-12-2019-0310.
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Purpose This paper aims to clarify the relationship between the performance of the metal nanoparticles and the sensitivity of the fiber surface plasma resonance (SPR) sensor. It proposes modeling the sensing effects of a single-mode fiber SPR sensor with a cone angle structure decorated with metal nanoparticles. This study uses the metal nanoparticles to the realize enhanced sensitivity of refractive index sensing. Design/methodology/approach This paper opted for an exploratory study using a simulation approach of finite-difference time-domain (FDTD). Specifically, the effect of size, the material and the shape of the metal nanoparticle on sensing performance are investigated theoretically. Findings In conclusion, it is evident that the localized SPR (LSPR) effect weakens as the diameter of the gold nanosphere increases, the SPR effect enhances and the SPR sensitivity increases first and then decreases. The metal nanoparticle with the different materials and different shapes also have different LSPR and SPR sensitivity and wavelength length dynamic range. The investigation shows that, by changing parameters, the reflection spectra of the fiber SPR sensor exhibit an obvious transition from LSPR to SPR characteristics, and enhanced sensitivity of the refractive index is realized. Originality/value This paper fulfills an identified need to study how the sensitivity of the fiber SPR sensor can be enhanced by the metal nanoparticle. After the optimization of parameters, the sensitivity of 5,140 nm/RIU is achieved, which provides a new research direction for sensitivity enhancement of fiber SPR sensor.
4
He, Xiao Cong, Ian Pearson, and Ken W. Young. "Three Dimensional Finite Element Analysis of Transverse Free Vibration of Self-Pierce Riveting Beam." Key Engineering Materials 344 (July 2007): 647–54. http://dx.doi.org/10.4028/www.scientific.net/kem.344.647.
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Self-pierce riveting (SPR) is nowadays widely used in the car manufacturing industry where aluminium alloys are used for body construction. For the design of mechanical structures, formed by the joining of component parts, a knowledge of the vibration characteristics of different joint types (adhesive bonding, spot welding, SPR etc) is essential. The free transverse vibration characteristics of single lap-jointed encastre SPR beams are investigated theoretically in this paper using the three dimensional finite element method (FEM). Numerical examples are provided to show the influence on the natural frequencies, natural frequency ratios and mode shapes of these beams caused by variations in the material properties (E and υ) of the sheet material. It is shown that the transverse natural frequencies of single lap jointed encastre SPR beams increases significantly as the Young’s Modulus of the sheets increases, but only slight changes are encountered for variations of Poisson’s Ratio. It is found that an exponential curve gives an acceptable fit to the relationship between natural frequency and Young’s Modulus. As expected, odd modes shapes were found to be symmetrical about the mid-length position and even modes were anti-symmetrical.
5
Jepps, Lewis, Paul Briskham, Neil Sims, and Luca Susmel. "Investigation into the Effect of Interlock Volume on SPR Strength." Materials 16, no. 7 (2023): 2747. http://dx.doi.org/10.3390/ma16072747.
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During the design of automotive structures assembled using Self-Piercing Rivets (SPRs), a rivet and die combination is selected for each joint stack. To conduct extensive physical tensile testing on every joint combination to determine the range of strength achieved by each rivet–die combination, a great deal of lab technician time and substrate material are required. It is much simpler and less material-consuming to select the rivet and die solution by examining the cross sections of joints. However, the current methods of measuring cross sections by measuring the amount of mechanical interlock in a linear X–Y direction, achieved with the flared rivet tail, do not give an accurate prediction of joint strength, because they do not measure the full amount of material that must be defeated to pull the rivet tail out of the bottom sheet. The X–Y linear interlock measurement approach also makes it difficult to rapidly rank joint solutions, as it creates two values for each cross section rather than a single value. This study investigates an innovative new measurement method developed by the authors called Volumelock. The approach measures the volume of material that must be defeated to pull out the rivet. Creating a single measurement value for each rivet–die combination makes it much easier to compare different rivet and die solutions; to identify solutions that work well across a number of different stacks; to aid the grouping of stacks on one setter for low-volume line; and to select the strongest solutions for a high-volume line where only one or two different stacks are made by each setter. The joint stack results in this paper indicate that there is a good predictive relationship between the new Volumelock method and peel strength, measured by physical cross-tension testing. In this study, the Volumelock approach predicted the peel strength within a 5% error margin.
6
Dai, Xiaoyu, Yanzhao Liang, Yuting Zhao, Shuaiwen Gan, Yue Jia, and Yuanjiang Xiang. "Sensitivity Enhancement of a Surface Plasmon Resonance with Tin Selenide (SnSe) Allotropes." Sensors 19, no. 1 (2019): 173. http://dx.doi.org/10.3390/s19010173.
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Single layers of tin selenide (SnSe), which have a similar structure as graphene and phosphorene, also show excellent optoelectronic properties, and have received much attention as a two-dimensional (2D) material beyond other 2D material family members. Surface plasmon resonance (SPR) sensors based on three monolayer SnSe allotropes are investigated with the transfer matrix method. The simulated results have indicated that the proposed SnSe-containing biochemical sensors are suitable to detect different types of analytes. Compared with the conventional Ag-only film biochemical sensor whose sensitivity is 116°/RIU, the sensitivities of these SnSe-based biochemical sensors containing α-SnSe, δ-SnSe, ε-SnSe, were obviously increased to 178°/RIU, 156°/RIU and 154°/RIU, respectively. The diverse biosensor sensitivities achieved with these three SnSe allotropes suggest that these 2D materials can adjust SPR sensor properties.
7
Lu, Yi, Xiao Cong He, and Yi Feng Wang. "Study on Mechanical Properties of Self-Piercing Riveted Joints about Titanium Alloy." Applied Mechanics and Materials 723 (January 2015): 856–59. http://dx.doi.org/10.4028/www.scientific.net/amm.723.856.
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Adopting self-piercing riveting (SPR) joining, a new light sheet material joining method, to examine the joining of copper-titanium alloy (H62-TA1) sheet and titanium-aluminum alloy (TA1-Al5052) sheet. Also, using quasi-static mechanical test to figure out mechanical properties of H62-TA1 SPR single-lap joint and TA1-Al5052 SPR single-lap joint. In this study, using Dixon guidelines to eliminate abnormal value and adopting coefficient of variation method to validate reliability of test datum. The results show that failure mode of H62-TA1 joints is that the rivets are pulled out, failure mode of TA1-Al5052 joints is that the bottom sheet fracture. And tensile displacement and energy absorption of H62-TA1 joints are higher than that of TA1-Al5052 joints.
8
Kim, Min Gun, Jin Hak Kim, Kun Chan Lee, and Won Yi. "Assessment for Structural Stiffness and Fatigue Life on Self-Piercing Rivet of Car Bodies." Key Engineering Materials 297-300 (November 2005): 2519–24. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.2519.
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The highest structural stiffness of an SPR joint was exhibited in the specimen constituted with 5J32 and ASPH, and the lowest stiffness in that constituted with the single 5J32 combination. Even though the structural stiffness of an SPR joint specimen is roughly the same with another type of joint, the fatigue life is different according to sheet material and its thickness. The results of numerical analysis are nearly identical to those of experiments. Thus, it can be that FEM modeling in accordance with FEMFAT is effective in assessing the stiffness and fatigue life of SPR joints, and can be an alternative to experimental analysis.
9
Liu, Min, Xu Yang, Bingyue Zhao, Jingyun Hou, and Ping Shum. "Square array photonic crystal fiber-based surface plasmon resonance refractive index sensor." Modern Physics Letters B 31, no. 36 (2017): 1750352. http://dx.doi.org/10.1142/s0217984917503523.
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Based on surface plasmon resonance (SPR), a novel refractive index (RI) sensor comprising a square photonic crystal fiber (PCF) is proposed to realize the detection of the annular analyte. Instead of hexagon structure, four large air-holes in a square array are introduced to enhance the sensitivity by allowing two polarization directions of the core mode to be more sensitive. The gold is used as the only plasmonic material. The design purpose is to reduce the difficulty in gold deposition and enhance the RI sensitivity. The guiding properties and the effects of the parameters on the performance of the sensor are numerically investigated by the Finite Element Method (FEM). By optimizing the structure, the sensor can exhibit remarkable sensitivity up to 7250 nm/RIU and resolution of [Formula: see text] RIU with only one plasmonic material, which is very competitive compared with the other reported externally coated and single-layer coated PCF-based SPR (PCF–SPR) sensors, to our best knowledge.
10
Hossain, Md Biplob, and Md Masud Rana. "DNA Hybridization Detection Based on Resonance Frequency Readout in Graphene on Au SPR Biosensor." Journal of Sensors 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/6070742.
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This paper demonstrates a numerical modeling of surface plasmon resonance (SPR) biosensor for detecting DNA hybridization by recording the resonance frequency characteristics (RFC). The proposed sensor is designed based on graphene material as biomolecular recognition elements (BRE) and the sharp SPR curve of gold (Au). Numerical analysis shows that the variation of RFC for mismatched DNA strands is quiet negligible whereas that for complementary DNA strands is considerably countable. Here, graphene is used to perform faster immobilization between target DNA and probe DNA. The usage of graphene also changes the RFC that ensure hybridization of DNA event by utilizing its optochemical property. In addition, proposed sensor successfully distinguishes between hybridization and single-nucleotide polymorphisms (SNP) by observing the variation level of RFC and maximum transmittance. Therefore, the proposed frequency readout based SPR sensor could potentially open a new window of detection for biomolecular interactions. We also highlight the advantage of using graphene sublayer by performing the sensitivity analysis. Sandwiching of each graphene sublayer enhances 95% sensitivity comparing with conventional SPR sensor.