Gerhard Poll
YOU?
Author Swipe
View article: Tribomechanical effects of cutting fluids in high-speed cutting
Tribomechanical effects of cutting fluids in high-speed cutting Open
The supply of cutting fluid (CF) has numerous positive effects on the cutting process. However, supplying CF to the contact zone at high pressure is associated with a high energy consumption for the pumps. Knowledge of the optimum CF-press…
View article: Investigation of local tribological conditions in the secondary shear zone for dry and wet machining using a microscale simulation model
Investigation of local tribological conditions in the secondary shear zone for dry and wet machining using a microscale simulation model Open
This study presents a microscale tribological simulation model to investigate local friction conditions in the secondary shear zone during both dry and wet machining. The precise characterization of tool-chip interactions, particularly the…
A Review of Testing and Suppression Strategies for Electrically Induced Failure in Rolling Bearings Open
Bearing voltages damage bearing surfaces and lead to early failure, particularly in motors powered by inverter-driven systems. With the growing adoption of electric vehicles, the operating conditions of their motor bearings have introduced…
Location- and time-resolved strain measurement in thrust roller bearings using thin-film sensors Open
Bearings play a crucial role in a broad range of engineering applications, such as automotive, aerospace and renewable energies. Particularly when it comes to larger and/or hard to replace/repair bearings, such as those in wind turbines, c…
Comprehensive Evaluation of the Rheological, Tribological, and Thermal Behavior of Cutting Oil and Water-Based Metalworking Fluids Open
Metalworking fluids (MWFs) are crucial in the manufacturing industry, playing a key role in facilitating various production processes. As each machining operation comes with distinct requirements, the properties of the MWFs have to be tail…
View article: Towards lifetime lubrication of wind turbine gearboxes: Technical and physical investigations on used oils
Towards lifetime lubrication of wind turbine gearboxes: Technical and physical investigations on used oils Open
Modern geared wind turbines rely on the adequate performance of their lubricant to ensure optimum operation of their main gearboxes. Potential oil ageing mechanisms, such as oxidation or additive depletion, can degrade oil performance over…
From Damage to Functionality: Remanufacturing of Thrust Roller Bearings by Tailored Forming Open
Axial and radial rolling bearings are critical components in various machines, particularly in large‐scale applications such as mining and heavy machinery. Failures in these bearings can cause significant operational downtime and high repl…
Biogenic palm oil-based greases with glycerol monostearate and soy wax: A rheological and tribological study Open
The increasing environmental concerns associated with conventional lubricants have led to a growing interest in sustainable alternatives, particularly biogenic grease. This study introduces a novel approach to synthesizing and characterizi…
Effects of contact path on lubricant distribution and EHL film formation Open
The dynamic motion of the rolling elements in rolling bearings leads to variations in the contact paths. The displacement of the rolling tracks and the contact width between adjacent rolling elements redistribute the lubricant, consequentl…
Frictional characteristics of elastomeric radial lip seals at extremely low temperatures Open
A novel low-temperature radial lip seal test rig was set up, allowing for simultaneous non-contact, telemetric measurements of both radial lip seal contact temperature and seal friction torque. Extreme cooling of the sealing contact zone d…
Enhancing practical modeling: A neural network approach for locally-resolved prediction of elastohydrodynamic line contacts Open
When modeling bearings in the context of entire transmissions or drivetrains, there are practical limits to the calculation resources available to calculate single bearings or even contacts. In settings such as these, curve-fitting methods…
Effect of Harmful Bearing Currents on the Service Life of Rolling Bearings: From Experimental Investigations to a Predictive Model Open
This study investigates the effects of harmful bearing currents on the service life of rolling bearings and introduces a model to predict service life as a function of surface roughness. Harmful bearing currents, resulting from electrical …
View article: Influence of the meniscus on wear in grease-lubricated oscillating rolling contacts
Influence of the meniscus on wear in grease-lubricated oscillating rolling contacts Open
Grease-lubricated rolling element bearings that perform oscillating motion are often prone to False Brinelling. Previous investigations on oscillating open contacts, i.e. no presence of a sticking zone, identified the replenishment of the …
Optimizing Stainless Steel Bearings: Enhancement of Stainless Steel Bearing Fatigue Life by Low-Temperature Forming Open
A proposed low-temperature forging method is presented to enhance stainless steel bearings by creating a martensitic subsurface layer, significantly boosting bearing fatigue life due to increased surface hardness. This technique induces be…
View article: Evaluating the Tribological Behaviour in Cutting Operations Using a Modified Ball-on-Disc Open Tribotester
Evaluating the Tribological Behaviour in Cutting Operations Using a Modified Ball-on-Disc Open Tribotester Open
Predicting the tribological behaviour in the secondary shear zone in the metal-cutting processes is considered a significant challenge in contemporary research. This work investigated the frictional performance in the secondary shear zone …
Optimizing Stainless Steel Bearings: The Impact of Low-Temperature Forming on Bearing Life Open
A proposed low-temperature forging method aims to enhance stainless steel bearings by creating a martensitic subsurface layer, significantly boosting bearing fatigue life due to increased surface hardness. This technique induces beneficial…
A Review on Sensor‐Integrating Machine Elements Open
This contribution summarizes the current state of research regarding so‐called sensor‐integrating machine elements as an enabler of digitalization in mechanical engineering and——if available—their application in industry. The focus is on t…
Enhancing the Performance of Rapeseed Oil Lubricant for Machinery Component Applications through Hybrid Blends of Nanoadditives Open
Bio-lubricants have demonstrated promising tribological and physical properties, suggesting their potential advantages in the lubrication of critical machinery components. This study investigates the impact of using blended individual and …
Fluid-structure interaction coupling for elastohydrodynamic lubricated micro structured contacts Open
The reduction of friction coefficient plays a great positive role in many technical fields.In the past decades of research, a fine surface-structuring is often used to reduce friction.Research [1,2] has shown that the application of textur…
View article: Enhancement of lubricant replenishment under limited lubricant supply in rolling bearings
Enhancement of lubricant replenishment under limited lubricant supply in rolling bearings Open
This paper proposes a stripe-shaped surface pattern, aiming to enhance oil replenishment in rolling bearings that operate in challenging conditions where starved lubrication can result in failure. The pattern can be created through a chemi…