A sampling method to measure surface roughness of circular flat

2014 ◽  
Author(s):  
Kai Meng ◽  
Yongjian Wan ◽  
Fan Wu ◽  
Lijun Shen ◽  
Weihong Song
Keyword(s):  
Surface Roughness ◽  
Sampling Method ◽  
Measure Surface Roughness

Electrical Characterization of Low-Profile Copper Foil for Reduced Surface Roughness Loss

2016 ◽  
Vol 2016 (1) ◽  
pp. 000358-000363 ◽  
Author(s):  
Qianfei Su ◽  
A. Ege Engin ◽  
Jerry Aguirre
Keyword(s):  
Surface Roughness ◽  
Cross Sections ◽  
Transmission Lines ◽  
High Frequency ◽  
Printed Circuit Board ◽  
Electrical Characterization ◽  
Cavity Resonator ◽  
Circuit Board ◽  
Low Profile ◽  
Measure Surface Roughness

Abstract Signal attenuation in transmission lines is a major issue for reliable transmission in high frequency range. Knowledge of the electrical parameters of printed circuit board (PCB), including dielectric constant and loss tangent, is critical. Moreover, surface roughness has a great effect on loss in high frequency. This paper demonstrates an effective simulation fitting method for electrical material characterization. Cavity resonator is chosen as the circuit for characterization. A methodology is presented to measure surface roughness from cross sections, and compared with values extracted from resonator measurements. Several materials and copper foils treatments, including low-profile, are analyzed in this paper.

EFFECTS OF SOME MACHINING VARIABLES IN LATHE FACING USING A PROFILOMETER TO MEASURE SURFACE ROUGHNESS

1992 ◽  
Vol 5 (2) ◽  
pp. 243-253 ◽  
Author(s):  
NOURREDINE BOUBEKRI ◽  
SHIHAB ASFOUR ◽  
MORRIS H. SCHNEIDER
Keyword(s):  
Surface Roughness ◽  
Measure Surface Roughness

Polymer-Based Capacity Micromachined Ultrasonic Transducer for Surface Roughness Measurement

2015 ◽  
Vol 661 ◽  
pp. 22-28 ◽  
Author(s):  
Gia Thinh Bui ◽  
Yi Ze Chen ◽  
Da-Chen Pang
Keyword(s):  
Surface Roughness ◽  
Ultrasonic Transducer ◽  
Roughness Measurement ◽  
Surface Roughness Measurement ◽  
Measure Surface Roughness ◽  
Capacitive Micromachined Ultrasonic Transducer ◽  
Signal Output ◽  
Good Signal ◽  
Reception Mode ◽  
Maximum Signal

A polymer-based capacitive micromachined ultrasonic transducer (CMUT) is developed to measure surface roughness. The transducer is designed with two groups in a ratio of two to one. By using air-coupled ultrasound, the transducer can evaluate surface roughness in five modes: full transmission/ full reception, majority transmission/ majority reception, majority transmission/ minority reception, minority transmission/ majority reception, and minority transmission/ minority reception. Experimentation shows the CMUT can identify the surface roughness using a sample of sandpaper with surface roughness Rrms ranging from 11.4μm to 179.8μm. The results indicate that the full transmission/ full reception mode has maximum signal output and the minority transmission/ majority reception mode can obtain a good signal output with a better energy efficiency rating.

scholarly journals Analysis of chip geometry and surface roughness at low speed turning in various commercial steels

2018 ◽  
Vol 159 ◽  
pp. 02018 ◽  
Author(s):  
Mudjijanto ◽  
Sulistyo ◽  
Rusnaldy
Keyword(s):  
Surface Roughness ◽  
Rapid Development ◽  
Tool Material ◽  
Shear Angle ◽  
Test Material ◽  
Low Speed ◽  
Measure Surface Roughness ◽  
Material Hardness ◽  
Small Industries

Rapid development of technology in manufacturing facilitates the industry to produce mass, high quality and affordable products. The challenge for small industries in manufacturing is to compete for product quality. Small manufacturing industries in controlling the quality of product deal with financial problems. Chip and surface roughness of low speed machining were tested to control the quality of material mechanical properties. The purpose of this study is to investigate the relation between chip characteristic and surface roughness with material hardness. This study used a conventional lathe with low rotation, cutting depth of 1 mm, dry turning process with variations of feed rate of 0.1 mm/rev, 0.2 mm/rev and 0.3 mm/rev, test material of AISI steel (1020, 1045, 1090, D2 and 4340) and tool material from carbides. Stereoscopic Optical Microscopy (SOM) was used to measure temporary shear angle while surface roughness tester was used to measure surface roughness. The results show that the shear angle of the chip and the surface roughness correlated with the hardness of the material.

Surface Roughness of Nanohybrid Composites with Different Monomers after Finishing and Polishing with Different Polishing Systems

2020 ◽  
Vol 835 ◽  
pp. 41-49
Author(s):  
Youssef Alaa Soliman ◽  
ELsayed Moustafa Mahmoud ◽  
Mohammed A. Gepreel ◽  
Rania Reda Afifi
Keyword(s):  
Surface Roughness ◽  
Bisphenol A ◽  
Resin Composite ◽  
Pairwise Comparison ◽  
Composite Resins ◽  
Dimer Acid ◽  
Atomic Force ◽  
Measure Surface Roughness ◽  
Significant Difference ◽  
Free Monomer

Background: The most frequently used monomer in commercial composite resins is bisphenol A glycidyl dimethacrylate. Bisphenol A glycidyl dimethacrylate free monomer and the long chain dimer acid based monomer were considered as an alternative method to improve mechanical and physical properties of composite resins. Objective: To study the surface roughness of different nanohybrid composites with different monomer compositions after finishing and polishing with different polishing systems. Materials and Methods: 72 composite disk specimens were prepared and divided into 3 groups (n=24) according to the resin composite that were used (harmonizekerr, venus diamondheraeuskulzer and n'duranceseptodont). Each group was subdivided into 4 subgroups (n=6) according to the polishing technique that was used (Jiffy natural universal wheelsultradent, sof-lex spiral wheels 3m espe, hilusterkerr or enhance system dentsply). Atomic force microscope was used to measure surface roughness. Results: There was statistical significant difference in surface roughness measuring among different n'durance, venus diamond and harmonize groups (Kruskal Wallis Test p<0.05). Post hock pairwise comparison revealed that venus diamond showed statistically significant higher surface roughness when compared with either n'durance and harmonize. Among the polishing systems, jiffy natural universal wheels produce the least surface roughness. Conclusion: Different monomer compositions may have direct effect on the final surface polish of the restorative materials. Clinical significance: The use of jiffy natural universal wheels may be found to result in the smoothest surface finish with the least clinical steps.

scholarly journals Acoustic Roughness Measurement of Railhead Surface Using an Optimal Sensor Batch Algorithm

2020 ◽  
Vol 10 (6) ◽  
pp. 2110 ◽  
Author(s):  
Wootae Jeong ◽  
Dahae Jeong
Keyword(s):  
Surface Roughness ◽  
Displacement Sensors ◽  
Measure Surface Roughness ◽  
High Measurement ◽  
Train Operation ◽  
Measurement Algorithm ◽  
Rolling Noise ◽  
Conventional Systems ◽  
Measurement Deviation ◽  
Mobile Measurement

Contact and friction between wheel and rail during train operation is the main cause of the rolling noise for which railways are known. Therefore, it is necessary to accurately measure the surface roughness of wheels and rails to monitor railway noise and predict noise around tracks. Conventional systems developed to measure surface roughness have large deviations in measured values or low repeatability. The recently developed automatic mobile measurement platform known as Auto Rail Checker (ARCer) uses three displacement sensors to reduce measurement deviation and increase the accuracy of existing systems. This paper proposes enhancing the chord offset synchronization algorithm applied to the existing ARCer for high measurement precision with only two displacement sensors. As a result, when the two sensor-based measurement algorithm was applied, the spectrum level at λ = 0.314 m, the wavelength amplification associated with wheel diameter, was reduced to at least 6 dB in comparison with that of the three sensors based algorithm. We also verified the accuracy of the proposed batch algorithm through a field test on an operating rail track with a corrugated rail surface.

scholarly journals Effect of Henna Addition on the Surface Roughness and Hardness of Polymethylmethacrylate Denture Base Material: An In-vitro Study

2017 ◽  
Author(s):  
Amal Nawasrah ◽  
Mohammed Gad ◽  
Mai El Zayat
Keyword(s):  
Surface Roughness ◽  
Base Material ◽  
In Vitro Study ◽  
Acrylic Resin ◽  
Control Group ◽  
Denture Base ◽  
Hardness Tester ◽  
Measure Surface Roughness ◽  
New Type

Statement of problem: Henna has been added to polymethylmethacrylate (PMMA) as a new type of antifungal agent; however, its effect on the latter&rsquo;s physical properties has not been investigated. Purpose: This study aimed to evaluate the effect of the addition of various henna concentrations on the surface roughness and hardness of PMMA denture base material. Materials and Methods: A total of 99 specimens of rectangular-shaped (10&times;20&times;3 mm3) acrylic specimens were prepared from heat-cured acrylic resin. Specimens were divided into one control group without the addition of henna and five test groups, which were prepared by adding Yamani henna powder to acrylic powder at concentrations of 1wt%, 2.5wt%, 5wt%, 7.5wt%, and 10wt%. The polymer was added to the monomer before being mixed, packed, and processed using the conventional water bath method. After processing, specimens were finished and polished, then kept in distilled water for 48+2 h. A profilometer and Vickers hardness tester were used to measure surface roughness and hardness respectively. Statistical data analysis was conducted via SPSS version 20.0 (IBM, USA). Results: The addition of henna at varying concentrations significantly increased surface roughness values (P &le; 0.01) while decreasing hardness (P &le; 0.0001). The most favorable addition value was 1% henna between all henna groups. Conclusion: The addition of henna to the acrylic resin may negatively affect the surface properties of PMMA acrylic denture base.

scholarly journals Effect of Fluoride Gels on the Surface Roughness of Different Composite Resins

2020 ◽  
Vol 14 (1) ◽  
pp. 474-481
Author(s):  
Marcela Monice Arruda ◽  
Marina Augusto Toppino ◽  
Gabriela Monteiro Barbosa ◽  
Hilton Túlio Costi ◽  
Cecy Martins Silva ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Morphological Changes ◽  
Composite Resins ◽  
Scanning Electron Microscopy Data ◽  
Fluoride Treatment ◽  
Measure Surface Roughness ◽  
Two Samples ◽  
Before And After ◽  
Gel Treatment ◽  
Microscopy Data

Background: The pH of fluoride gels influences the roughness of composite resins, which affects their clinical durability. Objective: To evaluate the effect of fluoride gels (1.23% acidified phosphate fluoride and neutral fluoride) on the morphology of different composite resins after finishing and polishing. Methods: We prepared sixty specimens with a diameter of 5 mm and a height of 2 mm. The specimens were then divided into six groups (n = 10), according to the type of composite resin (Z250 micro-hybrid (Z), Filtek Z350 XT nanoparticles (XT), and Tetric N-Ceram nano-hybrid (TC)) and fluoride gel treatment (1.23% acidified phosphate (APF) or neutral fluoride (NF)) to measure surface roughness (Ra). The material was light-cured using an LED-curing unit (Elipar Freelight Deep Cure-3M/ESPE) for 20 s with a light intensity of 1.200 mW/cm2. Ra measurements were performed before and after treatment with different fluoride gels using a rugosimeter (Mitutoyo SJ210). After Ra, we selected two samples from each group for evaluation using scanning electron microscopy. Data were analyzed using the Shapiro-Wilk, ANOVA, and Tukey tests, with a significance of 5%. Results: The average Ra before and after NF did not differ statistically. The average Ra values of the groups treated with APF showed statistically significant differences. The photomicrographs of the groups treated with NF were similar to those of the groups without fluoride treatment. The APF-treated groups showed significant morphological changes. Conclusion: NF did not promote changes in the morphology of the evaluated composite resins, in contrast to APF, which caused significant changes.

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