Experimental Investigation on Friction and Wear Performance of C/C Composite Finger Seal

2021 ◽  
Vol 144 (2) ◽  
Author(s):  
Zhang Yan-chao ◽  
Zhou Rui-min ◽  
Yin Ming-hu ◽  
Zhang Yong-tao ◽  
Hu Hai-tao ◽  
...  
Keyword(s):  
Performance Test ◽  
Base Alloy ◽  
Friction Pair ◽  
Good Choice ◽  
Wear Loss ◽  
Test Results ◽  
Durability Test ◽  
Friction Characteristics ◽  
Before And After ◽  
Pin On Disc

Abstract In order to find a good friction pair for the finger seal, the pin-on-disc friction tests matching the actual working conditions of finger seal are designed based on the performance simulation of finger seal and the similarity principle of PV value, in which the friction characteristics between pins with two different materials (C/C composite or cobalt-base alloy GH605) and discs with two different coatings (Cr3C2 or Al2O3) are tested and analyzed respectively; the test results show that the wear loss of all the friction pairs increases with the load increasing, but the friction coefficient of the C/C composite pin (no matter contacting with Cr3C2 or Al2O3 coating) is much less than that of GH605 pin; in the four kinds of friction pairs, the C/C–Cr3C2 pair has the greatest friction characteristics and least wear loss. Then, to verify the application feasibility of C/C composite in the finger seal further, the bench-scale performance test of the finger seal with C/C–Cr3C2 pair (the finger seal is made of C/C composite, and the rotor surface is coated with Cr3C2) is carried out with a self-developed testing rig; according to the leakage and wear results before and after the durability test lasted for 60 h, there is little distinct trace of destruction on the friction surfaces of finger seal with C/C–Cr3C2 pair after the durability test, which is in good agreement with the result of pin-on-disc friction test; besides, after the durability test, the static leakage of finger seal with C/C–Cr3C2 pair becomes lower than that before and is lower than that of finger seal made of GH605. The test results in this paper indicates that the C/C–Cr3C2 pair has nice friction characteristics and can be a good choice for the friction pair of the finger seal.

scholarly journals Effect of Temperature on the Tribological Properties of Selected Thermoplastic Materials Cooperating with Aluminium Alloy

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7318
Author(s):  
Anita Ptak ◽  
Paula Taciak ◽  
Wojciech Wieleba
Keyword(s):  
Aluminium Alloy ◽  
Contact Pressure ◽  
Tribological Properties ◽  
Polymer Materials ◽  
Effect Of Temperature ◽  
Test Results ◽  
Friction Process ◽  
Before And After ◽  
Pin On Disc ◽  
Two Parameters

This article concerns the tribological properties of three selected polymer materials: polyamide PA6, polyethylene PE-HD and polyetheretherketone composite PEEK/BG during sliding against aluminium alloy EN AW-2017A in the presence of hydraulic oil HLP 68. The tests were carried out under contact pressure p of 3.5–11 MPa at ambient temperature T ranging from −20 °C to +20 °C. The dependence of kinetic friction coefficient μk on the two parameters was determined through tribological tests carried out using a pin-on-disc tribometer. A five-level central composite rotatable design (CCRD) was adopted for the experiment. All the test results were statistically analysed. The microhardness of the surface of the polymeric material was measured before and after the friction process. The surface was also examined under SEM. Temperature and contact pressure have been found to have a significant effect on the tribological properties of the tested sliding pairs. Relative to the applied friction conditions, the surfaces after friction showed rather heavy signs of wear.

The Study of Anti-UV and Anti-Solarization of Strength Synthetic Fiber

2012 ◽  
Vol 573-574 ◽  
pp. 1224-1229
Author(s):  
Hai Yan Ni ◽  
Ying Jin Gan ◽  
Jin Ti You
Keyword(s):  
Fiber Bundle ◽  
Performance Test ◽  
High Strength ◽  
Uv Protection ◽  
National Standards ◽  
Synthetic Fiber ◽  
Test Results ◽  
Before And After ◽  
The Difference ◽  
Better Than

In view of anti-UV of the high strength synthetic fiber hoisting belt, the researcher compared the effects on anti-ultraviolet of SCJ-966 and HTUV100,through before and after intensity test and the test of Anti-solarization performance,then comparing with tests of fiber bundle strength,the reacher analyzed the effect of anti-UV and the difference on intensity.The result shows that:two UV performance are very good, far more than the European and national standards,and the webbing performance test results show that the UV protection of SCJ-966 UV protection is better than HTUV100, but the intensity rate is the former smaller than the latter, the extent damage of hoisting belt is the latter worse than the former.

Unjuk Kerja dan Emisi Gas Asap Genset Berbahan Bakar Biodiesel FAME

2019 ◽  
Vol 17 (3) ◽  
Author(s):  
Prawoto ◽  
Ihwan Haryono
Keyword(s):  
Performance Test ◽  
Acid Methyl Ester ◽  
Engine Performance ◽  
Load Test ◽  
National Standard ◽  
Variable Load ◽  
Durability Test ◽  
Exhaust Gas Emission ◽  
Before And After ◽  
Dummy Load

This paper describes performance and durability test results of three parallel stationary diesel engine using fatty acid methyl ester biodiesel blend fuel with composition B10 (10% biodiesel FAME), B15 (15% biodiesel FAME), and B0 (100% regular diesel fuel) as a baseline. Each engine was tested during 1000 hours. Performance and smoke test without generator was conducted on engine dynamometer before and after durability according to the National Standard of Indonesia. Performance test with variable load also conducted with generator attached using lamps as dummy load. Test result showed that all of three engines with difference fuel have relatively identical performance and not seen any significant decrease in performance during 1000 hour endurance test. Comparing to the B0, fuel consumption of B10 and B15 was higher in average of 1.4 % and 2.4 %, where are smoke emission decrease in order of 4.5% to 22.5%. For setting the engine at standard conditions, the best performance obtained for a mixture of 10% biodiesel (B10).Pada Makalah ini disampaikan hasil penelitian uji unjuk kerja dan ketahanan pada tiga mesin diesel stasioner (generator set) secara paralel dengan menggunakan bahan bakar campuran biodiesel-solar dengan komposisi B10 (10% biodiesel FAME), B15 (15% biodiesel FAME), dan B0 (100% solar) sebagai pembanding, masing-masing diuji selama 1000 jam. Uji unjuk kerja dan emisi gas asap mesin tanpa generator dilakukan pada engine dynamometer baik sebelum maupun sesudah uji ketahanan. Pengujian unjuk kerja dengan variasi beban dan generator terpasang juga dilakukan dengan menggunakan lampu sebagai beban. Hasil uji menunjukkan bahwa ketiga mesin dengan bahan bakar berbeda mempunyai unjuk kerja yang relatif identik dan tidak terlihat adanya penurunan unjuk kerja yang berarti selama uji ketahanan 1000 jam. Secara rata rata dibandingkan dengan B0, konsumsi bahan bakar Genset dengan B10 dan B15 lebih tinggi masing-masing sebesar 1,4 % dan 2,4 %, sedangkan emisi gas asap menurun antara 4,5 % sampai dengan 22,5 %.Untuk setting mesin pada kondisi standar, kinerja terbaik untuk campuran biodiesel 10% (B10).Keywords: Biodiesel, engine performance, durability, exhaust gas emission.

scholarly journals Effect of Reinforcement, Load and sliding distance on Al-4.5%wt Copper Matrix Hybrid Composites

2021 ◽  
Vol 10 (3S) ◽  
pp. 1-6
Author(s):  
K.C. Anantha Padmanbham ◽  
Mruthenjaya. M ◽  
Darshan B.G
Keyword(s):  
Hybrid Composites ◽  
Base Alloy ◽  
Copper Matrix ◽  
Stir Casting ◽  
Wear Loss ◽  
Casting Technique ◽  
Friction Stir ◽  
Matrix Microstructure ◽  
Pin On Disc ◽  
Composite Samples

Aluminum is prospectively a significant material for tribological appliances for the reason that of its less density and superior thermal conductivity. However, aluminium by itself displays deprived tribological properties. Hence, the investigation of the tribological performance of aluminium based composite materials is flattering increasingly significant. Hence in the present research tribological behavior of Al-4.5%wt copper reinforced with varying percentage of zircon sand (2% -8% in increments of 2 %) with and without 2%wt graphite of hybrid composite samples prepared by friction stir casting technique.. To know the allocation of particles and bonding flanked by reinforcement with matrix, microstructure of the composites and base alloy were premeditated by means of “Optical and Scanning Electron Microscopy”. The wear loss was computed employing pin on disc apparatus at room temp underneath dry sliding state. The investigation reveals that the wear rate of Al-4.5%wtCu alloy effected by composition, load and speed..

scholarly journals Study on the Self-Organization of an Fe-Mn-C-B Coating during Friction with Surface-Active Lubricant

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3025 ◽  
Author(s):  
Marcin Barszcz ◽  
Mykhaylo Pashechko ◽  
Krzysztof Dziedzic ◽  
Jerzy Jozwik
Keyword(s):  
Friction Pair ◽  
Self Organization ◽  
Sliding Velocity ◽  
Laminar Structure ◽  
Friction Process ◽  
Nickel Chromium ◽  
Before And After ◽  
Pin On Disc ◽  
Surface Active ◽  
Sliding Distance

This paper investigates the friction process between an Fe-based coating and C45 steel with surface-active lubrication, as well as examines the coating surface before and after tribological testing. As a result, it is possible to determine whether the surface undergoes self-organization during friction. Coatings were produced by hardfacing a subeutectic alloy Fe-Mn-C-B modified by silicon, nickel, chromium and copper. Tribological tests were performed using a pin-on-disc tribometer. The pin (coating) and the disc made of steel C45 were subjected to heat treatment (hardening and tempering). The tests were carried out under loads of 3 MPa, 7 MPa and 10 MPa at a constant sliding velocity of 0.4 m/s and a sliding distance of 5700 m using a surface-active lubricant (glycerine oil). Obtained results were compared with the published results of previous tests carried out under the same conditions but under a load of 20 MPa. Obtained microscopic and spectroscopic results demonstrate that that the friction pair materials (the coating made of subeutectic alloy Fe-Mn-C-B modified by Si, Ni, Cr, Cu and C45 steel) and the surface-active lubricant cause self-organization during friction. The friction surface of the coatings has a flay-laminar structure and is covered with triboreaction products. The surface shows the presence of wear-resistant compounds such as oxides, carbides, borides and nitrides.

Performance Test of N80 Expandable Casing

2010 ◽  
Vol 160-162 ◽  
pp. 1095-1099
Author(s):  
Bin Yang ◽  
De Zhi Zeng
Keyword(s):  
Wall Thickness ◽  
Performance Test ◽  
Outer Diameter ◽  
Test Results ◽  
Axial Deformation ◽  
Expansion Process ◽  
Collapse Strength ◽  
Mechanism Research ◽  
Before And After ◽  
Reliable Basis

A more comprehensive,systematic experimentical ground tests of the expansion process of expandable casing were performed. In the tests, 6 5 1/2"N80 casings were selected, of which five had been carried out expansion tests , another one casing was used to test the collapse strength , not been expanded. In the course of the tests,some important parameters of the expandable casing were measured before and after expansion,including the inner and outer diameter, wall thickness, ovality, wall thickness of inequality and the axial deformation, etc..These data provide a reliable basis for the mechanism research of the N80 casing expansion. After expansion tests, these six casing pipes had been performed the collapsing tests in Xi'an Tubular Goods Research Institute of CNPC.The test results show that after expansiong the collaps strength of expandable casing get decreased compared with unexpanded casing which provides a practical basis and reference for the design of expandable casing.

EVALUATION OF TiN COATING PROPERTIES DEPOSITED ON HS6-5-2C STEEL

Tribologia ◽  
2020 ◽  
Vol 291 (3) ◽  
pp. 23-31
Author(s):  
Joanna Kowalczyk
Keyword(s):  
Sliding Friction ◽  
Friction Pair ◽  
Linear Wear ◽  
Profile Measurement ◽  
Test Results ◽  
Tin Coating ◽  
Before And After ◽  
The Coefficient Of Friction ◽  
Nanohardness Tester ◽  
Tribological Parameters

The article presents selected properties of TiN coating on HS6-5-2C steel by Physical Vapour Deposition (PVD). The coating thickness was measured with a Calotest, and its hardness was measured with a nanohardness tester. Tribological parameters were determined, namely, the coefficient of friction and linear wear on the TRB3 tester operating in a ball-on-disk sliding friction pair. The disc was made of HS6-5-2C steel with a TiN coating and the ball of 100Cr6 steel without coating and with a-C:H coating, with Al2O3. The tests were performed under technically dry friction conditions. The coating structure observations were made using a scanning microscope, and the analysis of the geometric structure of samples, before and after tribological tests, were performed with an optical profile measurement gauge. The test results showed that the lowest linear wear was obtained for friction pairs with an Al2O3 ball and a steel ball with a-C:H coating applied.

Sunlight exposure: the effects on the performance of paragliding fabric

2018 ◽  
Vol 69 (05) ◽  
pp. 381-389
Author(s):  
MENGÜÇ GAMZE SÜPÜREN ◽  
TEMEL EMRAH ◽  
BOZDOĞAN FARUK
Keyword(s):  
Mechanical Properties ◽  
Aging Process ◽  
Air Permeability ◽  
Sunlight Exposure ◽  
Test Results ◽  
Coating Materials ◽  
Strength Tests ◽  
Before And After ◽  
The Relationship ◽  
Dark Blue

This study was designed to explore the relationship between sunlight exposure and the mechanical properties of paragliding fabrics which have different colors, densities, yarn counts, and coating materials. This study exposed 5 different colors of paragliding fabrics (red, turquoise, dark blue, orange, and white) to intense sunlight for 150 hours during the summer from 9:00 a.m. to 3:00 p.m. for 5 days a week for 5 weeks. Before and after the UV radiation aging process, the air permeability, tensile strength, tear strength, and bursting strength tests were performed. Test results were also evaluated using statistical methods. According to the results, the fading of the turquoise fabric was found to be the highest among the studied fabrics. It was determined that there is a significant decrease in the mechanical properties of the fabrics after sunlight exposure. After aging, the fabrics become considerably weaker in the case of mechanical properties due to the degradation in both the dyestuff and macromolecular structure of the fiber

PENGARUH MODEL PEMBELAJARAN KELILING KELOMPOK (ROUND CLUB) TERHADAP KETERAMPILAN MENULIS LAPORAN PERJALANAN SISWA KELAS V SDN 01 NAGARI BUKIK SIKUMPA

2020 ◽  
Author(s):  
Wirda Linda
Keyword(s):  
Standard Deviation ◽  
Performance Test ◽  
Writing Skills ◽  
Learning Model ◽  
Homogeneity Test ◽  
Test Results ◽  
Class V ◽  
Average Value ◽  
Normality Test ◽  
Lecture Method

This research is motivated by the low desire of students in writing travel reports. The lack of students' knowledge of the report concept, the lack of students' knowledge of the 5W + 1H report points of good and correct language, the lack of students' knowledge of the spatial, time and topic pattern and not yet reached KKM 75. The method used by the teacher has not been interesting, lecture method. The purpose of this study is to describe the skills of writing travel reports by using Round Club learning model which is viewed from the aspect of understanding the report concept, the use of 5W +1H report points, the spatial, time, and topic pattern.The population of this study is the students of class V Lessons Year 2017/2018 which amounted to 2 classes with the number 80. The sample of research as much as two classes taken by the sample of propotional.Class V.1 as experimental class and class V.2 as control class. The research instrument used is performance test. Provide an assessment by specifying the subject of the 5W + 1H report, as well as the spatial, time and topic pattern. Data were analyzed by 't' test by first testing normality, homogeneity, and hypothesis testing.The results showed that the average control class 68 with more than enough qualifications with standard deviation 16.96. 83 experimental class with good qualification and standard deviation of 15.42 and there is a significant influence on the result of writing skill of class V SDN 01 Nagari Bukik SikumpaSubdistrict, Lima Puluh Kota. This is evidenced by the average value of writing skills in the experiment class higher than the average value in the control class. Normality test results indicate that the two sample classes of  Lo  values in the control class -0.2141 are smaller than the normal 0.190 Lt distributed. Homogeneity test results that the variation of this study is homogeneous at a real level of 0.05, because Ftable 2.16 > Fhitung 1.21 and the results of data analysis then obtained = 2.78 > 1.70 t table, so H0 rejected and H1 accepted. It can be concluded that there is Influence. Using  Learning  Model of Student Group Writing  Skills Travel Report of students of class V SDN 01 Nagari Bukik Sikumpa Subdistrict, Kabupaten Lima Puluh Kota.KeyWords: model pembelajaran round club, menulis laporan perjalanan.

Physical and performance characteristics related to starter status, position, and division in Japanese collegiate American-football players

2021 ◽  
pp. 1-8
Author(s):  
Junta Iguchi ◽  
Minoru Matsunami ◽  
Tatsuya Hojo ◽  
Yoshihiko Fujisawa ◽  
Kenji Kuzuhara ◽  
...  
Keyword(s):  
Performance Test ◽  
Vertical Jump ◽  
American Football ◽  
Football Players ◽  
Jump Height ◽  
Test Results ◽  
Repetition Maximum ◽  
Vertical Jump Height ◽  
Division 1 ◽  
And Performance

BACKGROUND: Few studies have investigated the variations in body composition and performance in Japanese collegiate American-football players. OBJECTIVE: To clarify what characterizes competitors at the highest levels – in the top division or on the starting lineup – we compared players’ body compositions and performance test results. METHODS: This study included 172 players. Each player’s body composition and performance (one-repetition maximum bench press, one-repetition maximum back squat, and vertical jump height) were measured; power was estimated from vertical jump height and body weight. Players were compared according to status (starter vs. non-starter), position (skill vs. linemen), and division (1 vs. 2). Regression analysis was performed to determine characteristics for being a starter. RESULTS: Players in higher divisions and who were starters were stronger and had more power, greater body size, and better performance test results. Players in skill positions were relatively stronger than those in linemen positions. Vertical jump height was a significant predictor of being a starter in Division 1. CONCLUSION: Power and vertical jump may be a deciding factor for playing as a starter or in a higher division.

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