JAST & STLE 共催ウェビナー 2021

 

このたび,日本トライボロジー学会では,アメリカ STLE(Society of Tribologists and Lubrication Engineers)との共催によりウェビナーを開催することになりました.アルゴンヌ国立研究所のAaron Greco博士,サンディア国立研究所John Curry博士をお迎えし,それぞれ下記の要領で実施いたします.特に,若手の学生,研究者・技術者の方のご参加をお待ち申し上げます.

1日目

日時

2021年12月8日(水) 10:00~11:30(日本時間)
2021年12月7日(火) 20:00~21:30(米国東部標準時)

講師

Aaron Greco 博士
Argonne National Laboratory, USA

講演題目

The effect of electrical current on premature white etching crack failures within wind turbine bearings
(風力タービン用軸受の白色亀裂を伴う早期損傷に及ぼす電流の影響)

要旨

Premature fatigue failures associated with local regions of microstructural degradation (i.e. White Etching Cracks (WECs)) are the predominate mode of failure within wind turbine drivetrain bearings. Although WECs have been reported in the field for over a decade, the conditions leading to this failure, and the process by which this failure culminates, are both highly debated. The present work, conducted by researchers at Argonne National Laboratory in the United States intends to highlight the effect that these realistic conditions have on the formation of WEC failures at the benchtop scale. It was documented that the levels of electrical current documented uptower are able to significantly accelerate the formation of WECs within several commercially available wind lubricants. However, very small levels of current, <25 mA seem, to have a minimal effect on the formation of WECs by the 300 million contact cycle run out limit. Once the methodology of inducing WECS via these means was established, the effect of lubricant formulation via variable base fluid and additive composition was studied.

形式

Zoom を用いた英語での開催です.

登録方法

下記のリンクより登録してください.登録者にはURLをメールにてご案内いたします.

◆ご登録はこちら(1日目:12/8)◆
登録締切:2021年12月7日

2日目

日時

2021年12月9日(木) 10:00~11:30(日本時間)
2021年12月8日(水) 20:00~21:30(米国東部標準時)

講師

John Curry 博士
Sandia National Laboratories, USA

講演題目

Structural, Environmental and Mechanochemical Interactions in Solid Lubricant Material Systems
(固体潤滑材料システムにおける構造,環境,機械化学的相互作用)

要旨

Sliding interfaces are common aspects of nearly all mechanical assemblies and devices, where maintenance free, low friction and low wear operation of solid lubricants are ideal, if not required. These critical interfaces are typically subjected to extreme environments, wide margins of operating temperatures, and expected to operate predictably. The materials featured in these studies are well established (Molybdenum Disulfide [MoS2]; Diamond-like Carbon [DLC]) yet many fundamental questions, especially those related to aging, remain within the community. This talk will explore environmental factors influencing mechano-chemical surface interactions during sliding and how microstructural differences can alter their behavior. The role of microstructure in degradation mechanisms related to performance in MoS2 films under terrestrial (water, oxygen) environments will be discussed, alongside new characterization methods coupled with molecular dynamics simulations to aid in predicting their behaviors to better understand fundamental mechanisms. Preliminary work detailing simple process modification approaches for plasma enhanced chemical vapor deposition (PECVD) of DLC to influence adhesion and initial friction behavior will be discussed. Lastly, we will demonstrate the promise of nanocrystalline noble metal alloys towards tribochemical production of DLC-like films and their promise as self-lubricating materials.
This work was funded by the Laboratory Directed Research and Development program at Sandia National Laboratories, a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under Contract DE-NA0003525. Any subjective views or opinions that might be expressed in the paper do not necessarily represent the views of the U.S. Department of Energy or the United States Government.

形式

Zoom を用いた英語での開催です.

登録方法

下記のリンクより登録してください.登録者にはURLをメールにてご案内いたします.

◆ご登録はこちら(2日目:12/9)◆
登録締切:2021年12月8日