The Influence of Heat Generation In the Contact Zone on Bearing Fatigue Behavior

Böhmer, Hans-Jürgen; Lösche, Thomas; Ebert, Franz-Josef; Streit, Edgar

doi:10.1115/1.2834090

Cited by 17 publications

(4 citation statements)

References 3 publications

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“…The contact force vector fQg contributed by a ball is expressed as Fig. 7 The S-N Curve [11] 031101-4 / Vol. 134, JULY 2012 Transactions of the ASME where Q i is a contact force component and a is the contact angle between a ball and the inner race.…”

Section: Housingmentioning

confidence: 99%

“…Although not directly written on catcher bearings, Taktak [10] et al determined that the friction coefficient decreases as the sliding interface temperature increases and that the shear stress due to sliding also decreased. Although not directly written on catcher bearings, Böhmer et al [11] conducted experiments to determine the influence of heat generation in the contact zone and found that: (i) heat generated in the contact zone increased contact pressure, the size of contact zone, and the amount of sliding, and (ii) fatigue strength for rolling contact fatigue decreased as the temperature increases.…”

Section: Introductionmentioning

confidence: 99%

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Catcher Bearing Life Prediction Using a Rainflow Counting Approach

Lee

Palazzolo

2012

Journal of Tribology

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Catcher bearings (CB) are an essential component for rotating machine with active magnetic bearings (AMBs) suspensions. The CB's role is to protect the magnetic bearing and other close clearance component in the event of an AMB failure. The contact load, the Hertzian stress, and the sub/surface shear stress between rotor, races, and balls are calculated, using a nonlinear ball bearing model with thermal growth, during the rotor drop event. Fatigue life of the CB in terms of the number of drop occurrences prior to failure is calculated by applying the Rainflow Counting Algorithm to the sub/surface shear stress-time history. Numerical simulations including high fidelity bearing models and a Timoshenko beam finite element rotor model show that CB life is dramatically reduced when high-speed backward whirl occurs. The life of the CB is seen to be extended by reducing the CB clearances, by applying static side-loads to the rotor during the drop occurrence, by reducing the drop speed, by reducing the support stiffness and increasing the support damping and by reducing the rotor (journal)-bearing contact friction.

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Section: Housingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Catcher Bearing Life Prediction Using a Rainflow Counting Approach

Lee

Palazzolo

2012

Journal of Tribology

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“…when elements dilate and thus, the performance of ball bearing is evaluated. Böhmer et al [12] demonstrated the influence of the generated heat flux by friction on the fatigue behavior of a ball bearing. Muzychka and Yovanovitch [13] built their research on Blok's findings [14] to estimate the contact resistance associated with maximum temperature in case of an elliptical contact.…”

Section: Introductionmentioning

confidence: 99%

Thermo-dynamical modelisation of the degradation of a ball bearing in variables use conditions

Belmiloud

Lachi

Pron

et al. 2020

Mechanics & Industry

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Many sources of heat can emanate from the operation of a rotating machine, and one of which is the friction among the different parts of the ball bearings. Over time, these frictions may lead to a tearing of matter of the rings or on the rolling elements that cause some type of degradation by flaking. Flaking, in turn, produces a repetitive shock as a new source of thermal energy. This work proposes a physical model for the study of the thermal heating of a ball bearing during operation. The resolution of the energy balance is achieved by the Nodal method where both the heating due to friction and the heat induced by the passage of the balls on defect are taken into account. The proposed thermal model is validated through an experimental thermal analysis. The obtained results show that the temperature increases in the position of defect ball ring with increasing rotational speed. The same results are obtained for the influence of radial load.

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“…In spite of the more demanding operating conditions, longer service lives and higher reliability is required. While classical subsurface fatigue is rare as failure mode in aerospace bearings due to designs with Hertzian contact stresses below the fatigue stress limit [22], surface initiated fatigue is the most important failure mode in high speed aerospace bearings. Surface initiated fatigue is a consequence of either overrun hard contamination particle indentations, mounting/handling damages in the rolling contacts, corrosion pittings or mixed friction regime in the rolling contact caused by frictional heating due to high rolling/sliding speeds.…”

Section: Materials and Surface Technologies For High Efficient Aerospmentioning

confidence: 99%

The Evolution of Reliability and Efficiency of Aerospace Bearing Systems

Gloeckner¹,

Rodway²

2017

ENG

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The worldwide air traffic underwent a rapid development in recent decades. Between the early 70s and the late 90s of the last century civil air traffic doubled every 15 years. The civil aviation market will continue to grow with 4% -5% each year within the next 20 years. This enormous growth represents major challenges for airframers, engine makers, suppliers, airlines, air traffic management and ground infrastructure. In addition, the public debate on the worldwide civil air traffic is dominated by environmental and climate issues, even though only 2% of the man-made carbon dioxide (CO 2 ) emissions are due to air transportation. Therefore the aerospace industry will have to focus on a low-emission and quite air traffic, and on the conservation of natural resources and our environment. The end-use consumer and environmental policy requirements for aircrafts of the next generation translate into components with improved efficiency and reliability. Rolling bearings are one of these components which significantly determine the reliability and mechanical efficiency of aerospace applications such as aircraft and rotorcraft engines and transmission systems. They have to withstand very demanding operating conditions. Especially main shaft bearings in modern aircraft engines experience high rotational speeds and temperatures. Furthermore aerospace bearings have to meet the highest reliability standards and require low-weight design solutions. These operating conditions and requirements present a continuous challenge for improvements in all fields of bearing technology. This article presents solutions in aspects of materials, design, analysis, and surface technologies in order to meet the environmental, reliability, and economical requirements of advanced aerospace bearing systems. State of the art bearing analysis and advanced bearing design solutions contributing to lower friction power losses and increased systems efficiency are discussed. Weight, functional, and maintenance benefits are presented with the example of highly integrated aircraft engine main shaft bearings. It is also shown that the progress in bearing materials and surface technology devel-

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The Influence of Heat Generation In the Contact Zone on Bearing Fatigue Behavior

Cited by 17 publications

References 3 publications

Catcher Bearing Life Prediction Using a Rainflow Counting Approach

Catcher Bearing Life Prediction Using a Rainflow Counting Approach

Thermo-dynamical modelisation of the degradation of a ball bearing in variables use conditions

The Evolution of Reliability and Efficiency of Aerospace Bearing Systems

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