Results 241 to 250 of about 1,275,740 (271)

Micro-pitting and wear assessment of engine oils operating under boundary lubrication conditions

Tribology International, 2019
Current state-of-the-art engine oils tend to enhance micro-pitting damage in rolling contacts under certain operating conditions. ZDDP anti-wear additive was shown to promote such behavior.
Roland Larsson, Marcus Björling
exaly   +2 more sources

Micro-pitting Damage of Bearing Steel Surfaces under Mixed Lubrication Conditions: Effects of Roughness, Hardness and ZDDP Additive

Tribology International, 2019
Micro-pitting presents a failure of the rolling/sliding contact metal asperities operating under boundary/mixed lubrication conditions. The studies have shown that micro-pitting failure competes with mild wear and that lubricant additives can have either
Roland Larsson, Tobias Hultqvist, Aleks Vrcek   +2 more
exaly   +2 more sources

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Damage Mechanisms of Initiating Micro-Pitting on 42CrMo4 Hardened and Tempered Steel

Key Engineering Materials, 2007
A deep comprehension of the damage mechanisms involved in contact fatigue should optimize material and heat treatment choice for a specific application. In this work rolling disc-on-disc contact fatigue tests have been performed on a hardened and tempered UNI EN 42CrMo4 .
BARELLA, SILVIA, BONIARDI, MARCO VIRGINIO, CINCERA, SILVIA MARIA, D'ERRICO, FABRIZIO   +3 more
openaire   +2 more sources

Fabrication of micro pits based on megasonic assisted through-mask electrochemical micromachining

Ultrasonics, 2020
Through-mask electrochemical micromachining (TMEMM) is the primary method to fabricate micro pits with controlled size, location, and density. In order to improve the machining localization and deep etching capability in TMEMM process, a novel method which combined megasonic vibration to TMEMM process is presented in this paper.
Ke, Zhai, Liqun, Du, Yikui, Wen, Shuxuan, Wang, Qiang, Cao, Xi, Zhang, Junshan, Liu   +6 more
openaire   +2 more sources

Study on wear resistance of micro-pits texture on turning surface

2017 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO), 2017
Cutting tools with surface micro-textures can effectively improve the wear resistance of the tool and improve cutting conditions. The effects of average output power on the morphology and quality of the micro-textures were analyzed by laser processing technology.
Qianqian Cai, Yiquan Li, Umair Ayub, Zhanjiang Yu, Jinkai Xu, Huadong Yu   +5 more
openaire   +1 more source

Synergistic Boiling Enhancement on Hierarchical Micro-Pit/Carbon Nanotube Surfaces

ACS Applied Materials & Interfaces
Pool boiling offers exceptional heat transfer performance, making it crucial for advanced thermal management. However, simultaneously optimizing both critical heat flux (CHF) and heat transfer coefficient (HTC) is challenging due to the inherent trade-off between promoting bubble nucleation and mitigating detrimental bubble coalescence.
Zhiming Xu, Hongpeng Jiang, Xiaoliang Wang, Zhirong Zhang, Yunfeng Qiu, Jie Xu, Debin Shan, Bin Guo   +7 more
openaire   +2 more sources

The Lubrication Effect of Micro-Pits on Parallel Sliding Faces of SiC in Water

Tribology Transactions, 2002
Silicon carbide is regarded as a promising material for sliding bearings and mechanical seals working in water. In order to improve its load carrying capacity (or anti-seizure ability) in water, micro-pits were formed on one of the contact surfaces by ion reaction etching.
Xiaolei Wang, Koji Kato, Koshi Adachi
openaire   +1 more source

An Investigation on the Influence of Misalignment on Micro-pitting of a Spur Gear Pair

Tribology Letters, 2015
This study investigates the impacts of the angular misalignment that is tangent to the plane of action of spur gears on the contact fatigue life of micro-pitting crack nucleation using a computational approach. The governing equations of the mixed elastohydrodynamic lubrication are solved to determine the surface traction distributions.
openaire   +1 more source

Development of Workpiece Positioning System for Machining Micro-Pits of Hip Implant

Applied Mechanics and Materials
This paper describes a development of Electrical Discharge Machining (EDM) system for biomedical application. In general, the mechanism of EDM comprises of mechanical structure and electronic control system. This laboratory scale of the EDM system has a capability to accommodate the machining of hip implant which employs low power generator. The holder
Azli Yahya, Nasrul Humaimi, Kartiko Nugroho, Zahran Khudzari, Jaysuman Puspanathan   +4 more
openaire   +1 more source

Interaction between Two Pre-Existing Micro Pits on Pitting Propagation

CORROSION 2012, 2012
Abstract In the petroleum industry, pipeline failures are mostly the result of localized pitting corrosion which demonstrates the worst-case scenario for leaks as compared to metal loss due to uniform corrosion. When pitting nucleation occurs, numerous pits are generated within a short interval.
Zhenjin Zhu, Nima Tajallipour, Sina Fardisi, Patrick J. Teevens   +3 more
openaire   +1 more source