Gear failure analysis
Mary Beckman, Contributing Editor
| TLT Webinars April 2019
When gears fail it is most often due to fatigue and overloading. The most common form of distress and failure is actual breakage, but other modes of distress include surface fatigue known as pitting, normal and abnormal wear and plastic flow.
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New type of magnesium battery
Dr. Neil Canter, Contributing Editor | TLT Tech Beat April 2019
Much of the focus of new battery development has been to improve the performance of lithium-ion batteries. But these batteries have suffered in the past from negative characteristics such as flammability, which is leading researchers to look at other options. Read Full Article
– The TLT Archives Collection provides individuals web access to previous articles dating back to 2012. Quickly find articles using the keyword search on www.stle.org or find articles through popular search engines like Google and Yahoo. Click here to find the TLT Archives Collection
Featured article from Tribology Transactions
Biobased Poly-phosphonate Additives from Methyl Linoleates
By,Girma Biresaw, Grigor B. Bantchev & Rogers E. Harry-O’Kuru
Poly-dialkyl phosphonates were synthesized by reacting methyl linoleate with dimethyl, diethyl, and di-n-butyl phosphites in the presence of free radical initiator and positively identified and characterized using gas chromatography–mass spectrometry (GC-MS), nuclear magnetic resonance (NMR; 1H, 13C, 31P), and Fourier transform infrared (FTIR). Neat poly-dialkyl hosphonates and their blends in high-oleic sunflower oil (HOSuO) and polyalphaolefin (PAO-6) base oils were investigated for their physical, chemical, and tribological properties. At room temperature, the poly-dialkyl phosphonates displayed much better solubility in HOSuO than in PAO-6. Solubility in the base oils increased in the order dimethyl<diethyl<di-n-butyl. Relative to methyl linoleate, the neat polydialkyl phosphonates displayed higher density, higher kinematic viscosity, higher oxidation stability, and better cold flow (lower pour point and cloud point) properties. As an additive (0–10% w/ w) in HOSuO, increasing concentration of poly-di-n-butyl phosphonate resulted in increasing onset and peak oxidation temperatures and decreasing cloud point. Poly-di-n-butyl phosphonate blends in HOSuO also showed lower four-ball antiwear (AW) coefficient of friction (COF) and wear scar diameter (WSD) than corresponding blends with zinc dialkyl dithiophosphate (ZDDP). As an additive (0–10% w/w) in PAO-6 base oil, poly-di-n-butyl phosphonate displayed lower four-ball antiwear COF and comparable WSD relative to similar blends of ZDDP in PAO-6. The results indicate that poly-dialkyl phosphonates are promising biobased AW additives with comparable or better performance than current petroleum-based commercial AW additives such as ZDDP.
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is STLE’s bi-monthly scientific journal that contains peer-reviewed experimental and theoretical technical papers on lubrication, friction and wear of materials from the macro- to the nano-scale. STLE members have full online access and can search the complete archives. Join STLE today to access this and many other member benefits!
STLE News & Notes
Tribology Frontiers Conference abstract submission deadline extended to April 15, 2019
We invite authors to submit abstracts for consideration as podium presentations or for the poster competition in one of the following eight tracks: (1) surfaces and interfaces, (2) biotribology, (3) fluid lubrication, (4) lubricants, (5) machine elements and systems, (6) energy/environment/manufacturing, (7) tribochemistry, and (8) materials tribology. https://2019stlefrontiers.abstractcentral.com/
Poster presenters may submit a traditional 150 word abstract. We are asking the Oral presenters to submit the 150 word abstract as a summary and then upload a one-page extended abstract in Word format based on the conference template to be archived by on the STLE website. The deadline to submit abstracts is April 15, 2019.
Raise your profile through sponsorship and help STLE provide top-notch services at its Annual Meeting!
Want to heighten your company’s exposure at the upcoming STLE in Nashville and demonstrate your support of the Society’s 2019 Annual Meeting & Exhibition? There’s no better way than through Sponsorship!
Don’t Delay! Make sure your company stands out at the industry’s premiere Meeting and tradeshow event! Contact Tracy Nicholas VanEe TODAY at 630-922-3459 or email@example.com
STLE 2019 Exhibition show floor is SOLD OUT
The 2019 STLE Exhibition show floor is SOLD OUT. See who is exhibiting
We are in the process of expanding to accommodate additional booth space demand now. Please contact Tracy Nicholas VanEe at firstname.lastname@example.org
or call 630-922-3459 to reserve
Get your copy of the 2019 Annual Meeting advance program
The full technical program for the 2019 STLE Annual Meeting & Exhibition has been released in a 40-page advance program.
Click here to download your PDF copy of the Advance Program
Find all STLE 2019 conference details on the 365 Mobile App – Download the app today
The Society of Tribologists and Engineers has released the 2019 Meetings App through the STLE 365 Mobile App. The 2019 Meetings App. Use the STLE 365 meetings app to:
- Create your personal itinerary
- Review the meeting’s up-to-the minute schedule
- Interactively map the entire conference
- See a list of all 1,600 attendees
- See a list of the more than 100 exhibitors displaying at the trade show
- Review a list of the many special events and sponsors
- Use the badge-scanning lead-retrieval system
- Review details on the student posters
- Tap into a Nashville city map that includes information on weather, food and places to visit and entertain.
You can download the STLE app at iOS App Store, the Google Play Store just search "STLE 365" or by using the following auto-detect link on your device:
Members sign-in using your STLE ID and Password. If you have any issues logging in please contact me for assistance, email@example.com
. All non-members simply create a new account using the non-member option.
Use the STLE 365 app to stay connected with the organization all year round or use it for your annual meeting needs. To access the meeting portion of the app click on the “Events App” Icon and select the 74th STLE Annual Meeting & Exhibition.
2019 Keynote Address will explore Racing into the Future – Impact of Tribology on Vehicle Electrification
Electric mobility is quickly moving from someday to today as electric cars are becoming common, and even electric scooters and bikes are entering the mobility scene. The benefits of electrification are many, including reduced emissions and maintenance, and improved performance. It is also unsettling to many engineers who have spent a career enabling conventional engines and transmissions. While the needs of electric powertrains are different, the fundamentals are the same. We have been learning about those needs on the racetrack, through Formula E, as well as in conventional automotive powertrains. This talk will share some of these lessons and point the way of future tribology efforts.
The 2019 keynote address will be presented by Jeff Hemphill, Chief Technical Officer, Americas, with Schaeffler Group USA Inc. Join Jeff and STLE we explore the future of electric vehicles.
Click here to learn more
Don’t miss one of the first ever technical sessions on tribology in Electric Vehicles this May, Hosted by STLE Engine and Drivetrain Technical Committee for details on how to attend visit
Rooms are filling up fast. Reserve your room for the STLE 2019 Annual Meeting in Nashville
The Omni Nashville Hotel, STLE2019 Headquarter Hotel, has sold out. There are still individual rooms on certain nights available. We recommend calling the Omni Nashville Hotel directly at (800)843-6664 to see if they can accommodate you.
Rooms at the overflow hotels are filling up fast. If you are having issues finding a room online we recommend call the hotel directly to see if they can accommodate you.
Hilton Garden Inn Nashville Downtown Hotel
305 Korean Veterans Boulevard
Nashville, TN 37201
Click here to reserve a room at the Hilton Garden Inn
Hyatt Place Nashville Downtown
301 3rd Avenue South
Nashville, TN 37201
Click here to reserve a room at the Hyatt Place
for details on all the STLE 2019 hotels
NEW 2019 App Challenge – New Questions available every Monday
Join us for the 2019 STLE App Challenge running Jan. 14th through Jun. 30th - Only available on the STLE App
Congratulations to the winners of round three
1. Jason Papacek
3. Andrea Fernandez Vega
The STLE app challenge is an ongoing contest for 2019 that’s asks players to answer tribology and lubrication related questions. Every Monday new questions will be posted to the STLE Challenge through the STLE 365 app. Answer questions correctly to gain points. Players with the top three scores at the end of the each month win.
Winners will each receive a $10 Amazon Gift Card. In addition, all winners will be entered into a grand prize drawing.
Learn more about the STLE Challenge
. Challenge questions will resume on Monday, April 1, 2019.
STLE Local Section Events
Local sections are the best place to receive tribology and lubrication knowledge. Take a look below to see local section activities taking place close to you.
Central Illinois Section Meeting
Peoria, IL | Apr 3
Louisiana Section Meeting
Ruston, LA | Apr 4
Canton & Cleveland Sections Joint Meeting
Fairlawn, OH | Apr 9
Philadelphia Section Education Course
Oreland, PA | Apr 11
Houston Section Meeting
Houston, TX | Apr 12
Alberta Section Meeting
Calgary, AB | Apr 15
Pittsburgh Section Meeting
Pittsburgh, PA | Apr 16
Hamilton Section Meeting
Ontario, Canada | Apr 16
Northern California Section Meeting
Richmond, CA | Apr 17
Chicago Section Meeting
Sugar Grove, IL | Apr 18
For a list of all events including, Section activities, certification exams and industry event please view the STLE Calendar.
The Society of Tribologists & Lubrication Engineers (STLE) is the premier technical society serving the needs of over 13,000 individuals and 250 companies and organizations that comprise the tribology and lubrication engineering business sector. STLE members are employed by the world’s leading corporations, academic institutions and by governmental agencies dealing with science and technology. STLE supports these distinguished technical experts with a variety of professional education and certification programs.
Not yet an STLE member? Learn more about the
benefits of membership