DOCSLIB.ORG

Tribology & Mechanical Components Branch Overview Dr. Robert F

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Tribology & Mechanical Components Branch Overview Dr. Robert F Tribology & Mechanical Components Branch Overview Dr. Robert F. Handschuh NASA Glenn Research Center Cleveland, Ohio, U.S.A. Abstract: An overview of NASA Glenn Research Center's Tribology & Mechanical Components Branch is provided. Work in space mechanisms, seals, oil-free turbomachinery, and mechanical components is presented. An overview of current research for these technology areas is contained in this overview. Tribology &Mechanical Components Branch Overview Dr. Robert F. Handschuh NASA Glenn Research Center Cleveland, Ohio, U.S.A. Topics • View from 30,000 feet • Structures and Materials Division • Tribology &Mechanical Components Branch • Branch teams • Oil-free bearing research activities • Tribology activities • Seals Team activities • Drive system activities • Summary NASA Glenn Research Center Materials and Structures Division Capabiliti Materia ls and Structures Division Propulsion and Power System Components Aeroshells Surface mobility systems TPS; Cooled strs. Nozzles Cryogenic tanks In-space & on-surface modules Nacelles Rotor discs and systems Combustors Turbine vanes Engine fan system Energy absorbing systems Mechanisms Mechanical drive systems Oil-Free engines Human health systems Injectors Thrusters High-power motors Bearings and flywheels Space lubricants Solid oxide fuel cells, batteries Protective Coatings High temp. and cryogenic seals Sensors Porous membranes Thermoelectrics BN nanotubes ore R&T Capabilities Probabilistic methods Matl. and strl. Concepts Design technology Mechanical power transfer Health prognostics Experimental methods Impact dynamics Blast mechanics Measurement technology Structural mechanics Structural dynamics Aeroelasticity Material modeling Joining technology Durability and life Material characterization Failure and damage growth Fatigue and fracture Functional materials Processing technologies High temp. and cryo seals Metallic alloys Shape memory alloys Ceramic materials Computational materials Protective coatings Multifunctional Materials Surface science Extreme environment effects Lubricant chemistry Materials science High temperature chemistry Friction and wear Tribology & Mechanical Components Branch r “NASA ʼs one-stop-shop for all its mechanisms & lubrication needs” Branch Organization: â Oil-Free Turbomachinery – Dr. Chris DellaCorte â Space Mechanisms & Lubrication – Dr. Phil Abel â Aerospace Seals – Dr. Bruce Steinetz â Aero Drive Systems – Dr. Robert Handschuh • Tribology & Mechanical Components Branch Oil-Free Turbomachinery Space Mechanisms & Lubrication From basic research to app lication • Aero / Space application • Accelerated space lubricant life testing under vacuum • World-leading bearing experts • New mechanism concepts for planetary environment • Advanced modeling methods • New space lubricant development • Foil bearing predictive design • Terramechanics modeling & testing for efficient wheels Aerospace Seals Research Aero Drive Systems Heat Shield • Gear fatigue research Interface Seal • High speed gear lubrication • Drive system diagnostics • Fatigue crack modeling • Dynamic mechanical components • Rotorcraft transmission systems Docking Seal • Advanced rolling element and • Space habitat seals for extreme environments wave bearing technologies • Structural / thermal protection seals • Non-contacting turbine seals Oil-Free Turbomachinery CAD Foil air bearings TGIR Award for Level I Milestone: “Core Hot Bearing Tests” (OFTET) Oil-Free enabling technologies ? r PM304 bushings for industrial furnaces and valves " P10 , Oil-Free Key Facilities & Capabilities ambient pressure test rig Coating deposition research facility MicroTurbine proof-of-concept & environmental durability test facility Hot high-speed Shaft rotordynamic thrust foil bearing rig simulator test facility Space Tribology & Materials BEARING RIG Full Scale Bearing Tests Other Facilities: SPIRAL ORBIT TRIBOMETER *Vapor Pressure of Fluids Accelerated Lubricant Life VACUUM 4-BALL *Radiation Damage of Testing Under Realistic Accelerated Bulk Property Polymers Conditions Testing of Lubricants . Nano-Structured Lubricants for Tribology Carbon nanostructure transformation by industrially scalable GRC developed process Heating soot to high temperatures in an inert atmosphere graphitizes the carbon to form nano-onions. Addition of a small amount of nano-onions to oil improved the lifetime by a factor of 8x while decreasing the friction by a factor of 2.6 Spiral Orbit Tribometer (SOT) SOT Nano-grease Friction Traces Rotating plate 1000 moo 3000 moo (tilted up for clarity) - I Rotation u 3 Spiral orbit Ball orbit -^ '^ ® Nano-onions mixed with oil (I^'ytox : ^ 143AB) form a nano-grease. When tested in the SOT, which mimics the motion of a ball bearing, significant friction and lifetime improvements o. in air are realized. of Orbits Surface Science Tools Raman Dft„ema.ek-91- --p-d to aiff—t c Chermam b—fi w .m.s.e rwtn mir.na my ccz aaw RedNbnP^MYn.gWan: CF3 V.G. w^.C.F^ 0 FT-IR 0 1 2 3 ,um Depth (,,Metres) AFM Auger NASA GRC Seal Team NASA GRC Seal Team contributions have influenced several flight projects: - Shuttle main landing gear door environmental seals - Thermal barrier (braided carbon fiber rope) for nozzle joints of Shuttle and Atlas V SRM’s Thermal barrier for Shuttle and Atlas V SRM nozzle joints NASA GRC Seal Team Overview • NASA GRC Seal Team contributions have influenced several flight projects: – X-38 rudder/fin seals – X-37 flaperon seals Shel Mechanical seal attac Shelf/sealing surface: AETB-8 ,tile ;on'alumin structure Low Impact Docking System (LIDS) • LIDS is a system under development by NASA JSC designed to: – Provide gender-neutral (androgynous) interface permitting docking and berthing between any two space vehicles – Reduce impact loads between two mating space craft – Become new Agency standard for docking/berthing systems Seal Test Facilities alignment Drive System Test Facilities Spur Gear Fatigue Test Rigs Spiral Bevel / Face Gear Test Facilities Gear Noise / Dynamics Test Facility Split Torque Test Facility OH-58 Transmission Test Facility High Speed Helical Gear Train Facility Drive System Analytical Capabilities Finite Element Based Structural - Thermal Planetary Gear Dynamics High Speed Gearing Results NASA - ARL/VTD - Bell Helicopter 100 - _ ___ = -'" Bearing Losses 80 Total ` _...._.._..... Gear Meshing Losses Losses 60 (hp) 40 WIndage Losses 20 0 8000 10000 12000 14000 16000 18000 20000 Input Torque (in*lb) ' 2.85 4.7 0.15 P Windage = C3 C N D v 99 70 ------------ - f Dawson Model 1% Lube 60 ----------------- —v— Dawson Model 0.75% Lube -------- --- - - • _-_-_-_-_-_-_---f-_-_-_ - Daswson Model Lube •:- ------_-- •• -••• 98 - • %% Dawson Model 0.25% Lube 50 • • • --- ,------ • —^ Dawson Model - No Lube '------ • .- "'"" 97 Windage .........::-- --,..........._......::::::::::: .... ..... 40-.. EfÞciency Power - ---, .. ............. :... ' ........- , -------- - (%) Loss - --- ........... .. ... ......... _ ................... .....,- - ,.. (hp) 30 96 -------- ---- -------tom:........ ---- -- 20 / 0 Experimental Results 12500 RPM 95 d —,0— Experimental Results 15000 RPM • •^^• Analytical Prediction 12500 RPM 10 ...... _ .. ^.....- k - -—-------------- • • y* • Analytical Prediction 15000 RPM 94 0 1000 2000 3000 4000 5000 6000 8000 10000 12000 14000 Gearbox Power (hp) Input Shaft Speed (RPM) Condition Based Maintenance Objectives: Increase reliability and decrease false alarms for mechanical component diagnostics. Demonstrate integration of oil debris and vibration based damage detection techniques results in improved capability. Approach: Instrument and monitor all GRC gear fatigue test facilities and work with other govt. agencies, university, and industry Condition Based Maintenance Vibration Techniques 151 ^^15 (FM4,NA4) and Oil ,j Debris ^q 10 7 f J^ 11 S 10^ f i, r +r r ° RW r.-- n • ^ ^ n ^ ^ 500 100D 1500 2000 2500 3000 3.50 1 Reading Number 1 - r 0.9 Damage CLa 0.8 0.7 0.6 7@- 0.5 Inspect 0.4 Output of 0.3 0.2 Fuzzy Logic Model 0. 1-, Normal 0 0 500 1000 1500 2000 2500 3000 3500 Reading Number Wave Bearing Technology Bearing Concept Test Facility • Improved stability and cooling • Ability to tailor stiffness and damping • Use of hard sleeves Advanced Gear Material Surface Fatigue Results Fracture Toughness Gear Number Number of Median life Material of tests (million failures completed cycles) AMS 15 21 134 6308B [Ref. 10] AISI 25 33 200 9310 [Ref. 13] Ferrium 5 10 361 ® C69 [present study] Ferrium C69 AISI 9310 b, e^07 o4y1' r r,' • Excellent Contact Fatigue • Poor Fracture Toughness Space Mechanism Wear Dither Damage Assessment Low Cycle Bending Fatigue 650 600 550 500 Bending 450 Stress 400 Index (ksi) 350 300 250 200 1e+0 1e+1 1e+2 1e+3 1e+4 1e+5 Cycles Civil Tiltrotor Drive System Configuration r To Mid-Wing Gearbox Variable /Multi-Speed n Gearbox Tilt Axis Combiner Gearbox Gearbox Reduction Gearbox Hover Ratio 131.4: 1 Forward Flight Ratio 243.6 : 1 Penn State Univ. - NASA NRA R&D Rotorcraft Configuration —^ Assemble Model Flight r—— ——^ . Condition I I Pilot Flight Control System Inputs System Model . I I I I Powertrain • Control Law I I System Dynamics Gear Performance Subsonic Rotary Wing: High Fidelity Design Tools Windage Test Facility, NASA-GRC Drive Motor Speed Increasing '- Gearbox - Dr. Robert F. Handschuh, Army Research Lab, NASA - Glenn Mark A. Stevens, NASA Glenn Research Center In-Line Two Speed Advanced RC Drive System r J Wet / Dry Clutch Input Output Over-Running Clutch High Speed Operation (hover): Wet/ Dry Clutch engaged, Over-Running Clutch over-running Low Speed Operation (cruise): Wet/ Dry Clutch disengaged, Over-Running Clutch driving Dr. Robert F. Handschuh (October 2007) Variable / Multi-Speed Drive Facility Concept Flywheel Flywheel Torsional Drive Load Motor Transmission Concept Summary • Four main focus areas in the drive system area: * Oil-Free Turbomachinery * Tribology –Surface Science * Seals –Static and Dynamic * Drive System Technologies • Currently conduct /manage research within our center as well as at contractor and university locations • Involved in analytical and experimental developments • Work closely with the space &aerospace industry, other government agencies / NASA centers, NESCÉ..
Load more

Recommended publications
  • Lubrication Chemistry Viewed from DFT-Based Concepts and Electronic Structural Principles
    Int. J. Mol. Sci. 2004, 5, 13-34 International Journal of Molecular Sciences ISSN 1422-0067 © 2004 by MDPI www.mdpi.org/ijms/ Lubrication Chemistry Viewed from DFT-Based Concepts and Electronic Structural Principles Li Shenghua*, Yang He and Jin Yuansheng State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, P.R. China Tel.: +86 (10) 62772509, Fax: +86 (10) 62784691, E-mail: [email protected] URL: http://www.pim.tsinghua.edu.cn/sklt/sklt.html *Author to whom correspondence should be addressed. Received: 16 April 2003 / Accepted: 16 October 2003 / Published: 26 December 2003 Abstract: Fundamental molecular issues in lubrication chemistry were reviewed under categories of solution chemistry, contact chemistry and tribochemistry. By introducing the Density Functional Theory(DFT)-derived chemical reactivity parameters (chemical potential, electronegativity, hardness, softness and Fukui function) and related electronic structural principles (electronegativity equalization principle, hard-soft acid-base principle, and maximum hardness principle), their relevancy to lubrication chemistry was explored. It was suggested that DFT, theoretical, conceptual and computational, represents a useful enabling tool to understand lubrication chemistry issues prior to experimentation and the approach may form a key step in the rational design of lubrication chemistry via computational methods. It can also be optimistically anticipated that these considerations will gestate unique DFT-based strategies to understand sophisticated tribology themes, such as origin of friction, essence of wear, adhesion in MEMS/NEMS, chemical mechanical polishing in wafer manufacturing, stress corrosion, chemical control of friction and wear, and construction of designer tribochemical systems. Keywords: Lubrication chemistry, DFT, chemical reactivity indices, electronic structural principle, tribochemistry, mechanochemistry.
    [Show full text]
  • The Use of Artificial Intelligence in Tribology—A Perspective
    lubricants Perspective The Use of Artificial Intelligence in Tribology—A Perspective Andreas Rosenkranz 1,*, Max Marian 2,* , Francisco J. Profito 3, Nathan Aragon 4 and Raj Shah 4 1 Department of Chemical Engineering, Biotechnology and Materials, University of Chile, Santiago 7820436, Chile 2 Engineering Design, Friedrich-Alexander-University Erlangen-Nuremberg (FAU), 91058 Erlangen, Germany 3 Department of Mechanical Engineering, Polytechnic School, University of São Paulo, São Paulo 17033360, Brazil; fprofi[email protected] 4 Koehler Instrument Company, Holtsville, NY 11742, USA; [email protected] (N.A.); [email protected] (R.S.) * Correspondence: [email protected] (A.R.); [email protected] (M.M.) Abstract: Artificial intelligence and, in particular, machine learning methods have gained notable attention in the tribological community due to their ability to predict tribologically relevant pa- rameters such as, for instance, the coefficient of friction or the oil film thickness. This perspective aims at highlighting some of the recent advances achieved by implementing artificial intelligence, specifically artificial neutral networks, towards tribological research. The presentation and discussion of successful case studies using these approaches in a tribological context clearly demonstrates their ability to accurately and efficiently predict these tribological characteristics. Regarding future research directions and trends, we emphasis on the extended use of artificial intelligence and machine learning concepts in the field of tribology including the characterization of the resulting surface topography and the design of lubricated systems. Keywords: artificial intelligence; machine learning; artificial neural networks; tribology 1. Introduction and Background Citation: Rosenkranz, A.; Marian, M.; There have been very recent advances in applying methods of deep or machine Profito, F.J.; Aragon, N.; Shah, R.
    [Show full text]
  • TRIBOLOGY Lecture 3: FRICTION
    Video Course on Tribology Prof. Dr Harish Hirani Department of Mechanical Engineering Indian institute of Technology, Delhi Lecture No. # 03 Friction Welcome to the third lecture of video course on Tribology. Topic of this lecture is friction. It is interesting. We experience friction in day to day life when you walk we experience friction, when we cycle we experience friction, when we drive we experience friction. This is very common mode which we experience every day. TRIBOLOGY Lecture 3: FRICTION And often when you go to mall, we find this kind of signal or warning that slippery when the floor is wet. So, you need to be careful when you walk resending the water place as lubricant layer. Some Typical Values of Coefficient of Friction for Metals sliding on themselves Metals Sliding on themselves µ Aluminum 1.5 Copper 1.5 Copper((oxide film not penetrated) 0.5 Gold 2.5 Iron 1.2 Platinum 3 Silver 1.5 Steel(mild steel) 0.8 Steel(tool steel) 0.4 Observations: 1. μ > 1.0 2. Mild steel vs Tool steel 3. μ depends on environment. And it reduces the friction. So, we need to walk with more force. So, the overall the friction force turn out to be same. I have gone through number of books and found number of variation in coefficient of friction. So, I am just showing on the first slide of this course that typical value of coefficient friction which is often quoted in books. We say these values are static coefficient of friction or this value belongs to static coefficient of friction.
    [Show full text]
  • Static Friction at Fractal Interfaces
    Dorian Hanaor, Yixiang Gan and Itai Einav (2016). Static friction at fractal interfaces. Tribology International, 93, 229-238. DOI: 10.1016/j.triboint.2015.09.016 Static friction at fractal interfaces Dorian A. H. Hanaor, Yixiang Gan, Itai Einav School of Civil Engineering, University of Sydney, NSW 2006, Australia https://doi.org/10.1016/j.triboint.2015.09.016 Abstract: Tribological phenomena are governed by combined effects of material properties, topology and surface- chemistry. We study the interplay of multiscale-surface-structures with molecular-scale interactions towards interpreting static frictional interactions at fractal interfaces. By spline-assisted-discretization we analyse asperity interactions in pairs of contacting fractal surface profiles. For elastically deforming asperities, force analysis reveals greater friction at surfaces exhibiting higher fractality, with increasing molecular-scale friction amplifying this trend. Increasing adhesive strength yields higher overall friction at surfaces of lower fractality owing to greater true-contact-area. In systems where adhesive-type interactions play an important role, such as those where cold-welded junctions form, friction is minimised at an intermediate value of surface profile fractality found here to be in the regime 1.3-1.5. Our results have implications for systems exhibiting evolving surface structures. Keywords: Contact mechanics, friction, fractal, surface structures 1 Dorian Hanaor, Yixiang Gan and Itai Einav (2016). Static friction at fractal interfaces. Tribology
    [Show full text]
  • Tribology of Polymer Blends PBT + PTFE
    materials Article Tribology of Polymer Blends PBT + PTFE Constantin Georgescu 1,* , Lorena Deleanu 1,*, Larisa Chiper Titire 1 and Alina Cantaragiu Ceoromila 2 1 Department of Mechanical Engineering, Faculty of Engineering, “Dunarea de Jos” University of Galati, 800008 Galati, Romania; [email protected] 2 Department of Applied Sciences, Cross-Border Faculty, “Dunarea de Jos” University of Galati, 800008 Galati, Romania; [email protected] * Correspondence: [email protected] (C.G.); [email protected] (L.D.); Tel.: +40-743-105-835 (L.D.) Abstract: This paper presents results on tribological characteristics for polymer blends made of polybutylene terephthalate (PBT) and polytetrafluoroethylene (PTFE). This blend is relatively new in research as PBT has restricted processability because of its processing temperature near the degradation one. Tests were done block-on-ring tribotester, in dry regime, the variables being the PTFE concentration (0%, 5%, 10% and 15% wt) and the sliding regime parameters (load: 1, 2.5 and 5 N, the sliding speed: 0.25, 0.5 and 0.75 m/s, and the sliding distance: 2500, 5000 and 7500 m). Results are encouraging as PBT as neat polymer has very good tribological characteristics in terms of friction coefficient and wear rate. SEM investigation reveals a quite uniform dispersion of PTFE drops in the PBT matrix. Either considered a composite or a blend, the mixture PBT + 15% PTFE exhibits a very good tribological behavior, the resulting material gathering both stable and low friction coefficient and a linear wear rate lower than each component when tested under the same conditions. Keywords: polybutylene terephthalate (PBT); polytetrafluoroethylene (PTFE); blend PBT + PTFE; block-on-ring test; linear wear rate; friction coefficient Citation: Georgescu, C.; Deleanu, L.; Chiper Titire, L.; Ceoromila, A.C.
    [Show full text]
  • 3Rd Edition A.R
    WEAR – MATERIALS, MECHANISMS AND PRACTICE Editors: M.J. Neale, T.A. Polak and M. Priest Guide to Wear Problems and Testing for Industry M.J. Neale and M. Gee Handbook of Surface Treatment and Coatings M. Neale, T.A. Polak, and M. Priest (Eds) Lubrication and Lubricant Selection – A Practical Guide, 3rd Edition A.R. Lansdown Rolling Contacts T.A. Stolarski and S. Tobe Total Tribology – Towards an integrated approach I. Sherrington, B. Rowe and R. Wood (Eds) Tribology – Lubrication, Friction and Wear I.V. Kragelsky, V.V. Alisin, N.K. Myshkin and M.I. Petrokovets Wear – Materials, Mechanisms and Practice G. Stachowiak (Ed.) WEAR – MATERIALS, MECHANISMS AND PRACTICE Edited by Gwidon W. Stachowiak Copyright © 2005 John Wiley & Sons Ltd, The Atrium, Southern Gate, Chichester, West Sussex PO19 8SQ, England Telephone (+44) 1243 779777 Chapter 1 Copyright © I.M. Hutchings Email (for orders and customer service enquiries): [email protected] Visit our Home Page on www.wiley.com Reprinted with corrections May 2006 All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except under the terms of the Copyright, Designs and Patents Act 1988 or under the terms of a licence issued by the Copyright Licensing Agency Ltd, 90 Tottenham Court Road, London W1T 4LP, UK, without the permission in writing of the Publisher. Requests to the Publisher should be addressed to the Permissions Department, John Wiley & Sons Ltd, The Atrium, Southern Gate, Chichester, West Sussex PO19 8SQ, England, or emailed to [email protected], or faxed to (+44) 1243 770620.
    [Show full text]
  • Tribology Module3: Wear
    Tribology Module3: Wear Q.1. Why subsurface cracks are formed due to cyclic load? Ans: Cyclic loading often causes repetitive reversal of stresses, such as compressive stress to tensile stress. Due to such change in stresses, material experiences tiredness. Microstructure in-homogeneity, under tiring load condition, helps the formation of subsurface cracks. Q.2. What is zero wear limits? Ans: “Zero wear” means wear of material surfaces remains within the order of the surface finish. In other words “Zero wear limit” is the initial surface roughness of the material. Q.3. If indium has so high affinity that causes adhesive wear then why do we use it? Can indium be used as lubricant between two steel surfaces? Ans: Because of high affinity of indium, it is used to bond certain non-metallic such as glass, glazed, xeramics, mica, quartz, various metallic oxides, etc. It can be used as solid lubricant between two steel surfaces. Q.4. In adhesion wear taking place between similar materials, which surface is likely to get more damage? Won’t the chuck of particles be with the lower surface in case of similar surface? Ans: The outcome of adhesive wear is growing roughness and creation of lumps above the original surface. Lose of material from the surface depends on the softness of material. Softer material loses more material compared to harder material. In other words nothing can be said about which surface (lower/upper) will lose more material. Lose of material will depend on local hardness of the material. Q.5. What is “back transfer”? Ans: In adhesive wear, material is transferred from one material to other.
    [Show full text]
  • Molecular Tribology
    R.M. Overney Molecular Tribology Friction, wear and adhesion, the three major aspects of Tribology play an important role in mankind’s efforts to conserve energy. Friction and drag alone account for about one third of the energy needed to run our machines in the industrialized World. This does not account for energy losses due to consequential wear and failure of equipment. It is argued that about 1-2 percent of the GDP could be recovered with appropriate tribological solutions that entail besides liquid phase lubrication also effective solid phase solutions. The challenge is still to connect rational molecular designs to the phenomenological process parameters that attempt to describe the energy dissipation during frictional sliding. Historical Developments The Laws of Friction The Science of Tribology (Greek tribos : rubbing ) encompasses the study of adhesion , friction , lubrication and wear . All of these rate dependent processes are dissipative in nature. They involve interfaces that are transient. While adhesion studies are concerned with the formation and destruction of interfaces involving motions normal to the interface, friction studies concentrate on lateral motions of adjacent surfaces in contact. One very important aspect of friction studies has been the behavior of the third medium, referred to as lubricant. In contrast to lubrication that typically concentrates on fluid media (the exception are solid lubricants), wear is the visual manifestation of plastic deformations in solid material that occur in the course of dynamic contact. Leonardo da Vinci (1452-1519)) can be named as the father of modern Tribology . He studied a wide variety of subtopics form friction, lubrication and wear, to bearing materials and geometries, gears, screw-jacks, and rolling-element bearings.
    [Show full text]
  • A High-Temperature, Self-Lubricating, Powder Metallurgy Composite
    NASA Technical Memorandum 102355 Tribological Properties of PM212: A High-Temperature, Self-Lubricating, Powder Metallurgy Composite Christopher DellaCorte and Harold E. Sliney Lewis Research Center Cleveland, Ohio Prepared for the 1990 Annual Meeting of the Society of Tribologists and Lubrication Engineers Denver, Colorado, May 7-11, 1990 (_ASA-T,A-I02)55) TRI_UtOGICAL PRqP_RTIES OF N90-12o_9 PM212: A HIGh-TEMPERATURE, SLLF-LUBRICATING, P_W_ER M_TALLU_Y C_MPuSITE (NASA) 22 p CSCL OTA UnC|dS GSIZ] 0243Z48 NASA Technical Memorandum 102355 Tribological Properties of PM212: A High-Temperature, Self-Lubricating, Powder Metallurgy Composite Christopher DellaCorte and Harold E. Sliney Lewis Research Center Cleveland, Ohio Prepared for the 1990 Annual Meeting of the Society of Tribologists and Lubrication Engineers Denver, Colorado, May 7-11, 1990 (NASA-T'_-IO2355) TRI_ULOGICAL PRQPERTIES OF Ngo-12059 P_212: _ HIGo-TfMO_RATURE, SCLF-LU6_ICATING, P_N_ER METALLIJK_Y C_M_OS[TE (NASA) ZZ p CSCL _TA G._/Z] TRIBOLOGICAL PROPERTIES OF PM212: A HIGH-TEMPERATURE, SELF-LUBRICATING, PONDER METALLURGY COMPOSITE Christopher DellaCorte and Harold E. Sliney National Aeronautics and Space Administration Lewis Research Center Cleveland, Ohio 44135 ABSTRACT This paper describes a research program to develop and evaluate a new high temperature, self-lubricating powder metallurgy composite, PM212. PM212 has the same composition as the plasma-sprayed coating, PS212, which contains 70 wt % metal-bonded chromium carbide, 15 wt % silver and 15 wt % barium fluoride/calcium fluoride eutectic. The carbide acts as a wear resistant matrix and the silver and fluorides act as low and high temperature lubricants, respectively. The material is prepared by sequential cold press, cold isostatic pressing and sintering techniques.
    [Show full text]
  • Recent Advances in the Tribology and Bioengineering of the Skin
    RECENT ADVANCES IN THE TRIBOLOGY AND BIOENGINEERING OF THE SKIN 25 November 2014 Tribology Group and Biomedical One Birdcage Walk, London Division www.imeche.org/events/S6128 Seminar RECENT ADVANCES IN THE TRIBOLOGY AND BIOENGINEERING OF THE SKIN 25 November 2014, One Birdcage Walk, London RECENT ADVANCES IN THE TRIBOLOGY AND BIOENGINEERING BENEFITS OF ATTENDANCE: OF THE SKIN WILL PRESENT CUTTING EDGE SOLUTIONS AND • Analyse how modelling techniques are RADICAL NEW THINKING THAT used to elucidate the complex mechanics CHARACTERISE AND PREDICT of the skin with Dr. Georges Limbert THE BIOPHYSICS OF THE SKIN IN HEALTH AND DISEASE. • Understand how microclimate factors influence the integrity of the loaded skin This seminar will explore modelling techniques interface with Prof. Dan Bader for biotribology, including the latest advanced computational models for skin biophysics. • Learn how to tackle current challenges The principal goal is to explore how they in healthcare and personal care device are developed and can be implemented in development with Dr. Steve Franklin commercial, finite element codes to accelerate product development. • Study the prospects of consultant engineers in the high-growth ‘engineering for life sciences’ market AGENDA SNAPSHOT: (For the full programme, see page 2) • Predictive modelling of the static and dynamic friction behaviour of human skin • Biotribology: challenges in healthcare and personal care device development • Evaluation of the impact of sun exposure on the skin barrier using a biomechanics framework • Mechanical properties of the top-layers of human skin SPONSORSHIP & EXHIBITION OPPORTUNITIES GET INVOLVED Attending this event as either an exhibitor or sponsor will give you the opportunity to display your solutions, services and products to the right people at the right time.
    [Show full text]
  • Modeling and Simulation in Tribology Across Scales : an Overview A.I
    Modeling and simulation in tribology across scales : An overview A.I. Vakis, Vladislav Yastrebov, J. Scheibert, L. Nicola, D. Dini, C. Minfray, A. Almqvist, M. Paggi, S. Lee, G. Limbert, et al. To cite this version: A.I. Vakis, Vladislav Yastrebov, J. Scheibert, L. Nicola, D. Dini, et al.. Modeling and simulation in tribology across scales : An overview. Tribology International, Elsevier, 2018, 125, pp.169-199. 10.1016/j.triboint.2018.02.005. hal-01802145 HAL Id: hal-01802145 https://hal.archives-ouvertes.fr/hal-01802145 Submitted on 7 Jun 2019 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Modeling and Simulation in Tribology Across Scales: an Overview A.I. Vakis, V.A. Yastrebov, J. Scheibert, L. Nicola, D. Dini, C. Minfray, A. Almqvist, M. Paggi, S. Lee, G. Limbert, J.F. Molinari, G. Anciaux, S. Echeverri Restrepo, A. Papangelo, A. Cammarata, P. Nicolini, R. Aghababaei, C. Putignano, S. Stupkiewicz, J. Lengiewicz, G. Costagliola, F. Bosia, R. Guarino, N.M. Pugno, G. Carbone, M.H. Müser and M. Ciavarella* A.I. Vakis R. Aghababaei Advanced Production Engineering, Engineering and Technology Department of Engineering, Aarhus University, Inge Lehmanns Institute Groningen, Faculty of Science and Engineering, Gade 10, 8000 Aarhus C, Denmark University of Groningen, Nijenborg 4, 9747 AG Groningen, the Netherlands S.
    [Show full text]
  • Contact Mechanics and Tribology Match
    FEATURE ARTICLE Jeanna Van Rensselar / Contributing Editor Beneath the Why contact mechanics and tribology are a natural match KEY CONCEPTCONCEPTSS • CoContacntact mechanics iiss a sometimes oveoverlookedrlooked bbutut ccriticalritical asaspectpect of ttribology.ribology. • FriFrictionction rereductionduction iiss maximizmaximizeded by lleveragingeveraging the dydynaminamic bbetweenetween ssurfaceurface mmaterialaterial gengineeringg aandnd lublubricationrication genengineering. gineering. g. ••A Atetexturedxtured bbearinbearingg susurfacrface acts ass a lublubricantricant ,reservoirreservoir,, sstoringtoring daandnd ddispens-ispens- ing ththee llubricantubricant directly taatt ththee ppotinintt of ccontactontact wherwheree iitt makes mmostost ssense.ense. 52 • JULY 2015 TRIBOLOGY & LUBRICATION TECHNOLOGY WWW.STLE.ORG surface: Leveraging both disciplines together can yield results neither can achieve alone. WHEN THE THEORY OF CONTACT MECHANICS WAS FIRST DEVELOPED IN 1882, lubricants were not factored into the equation at all. Experts say that may be due to the lack of powerful ana- lytical and numerical tools that necessitated simplicity.1 The omission of lubrication from contact mechanics theory was resolved four years later when Osborne Reynolds developed what is now known as the Reynolds Equation. It describes the pressure distribution in nearly any type of fluid film bearing. WWW.STLE.ORG TRIBOLOGY & LUBRICATION TECHNOLOGY JULY 2015 • 53 Even with that breakthrough, how- WHY IS IT THE STRIBECK CURVE?4 ever, it was decades later before
    [Show full text]