A Multiscale Approach for Nonlinear Dynamic Response Predictions With Fretting Wear

Armand, Jason; Pesaresi, Luca; Salles, Loïc; Schwingshackl, Christoph W.

doi:10.1115/1.4034344

Cited by 24 publications

(16 citation statements)

References 23 publications

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“…However no record of this investigation performed on very flexible dampers can be found in literature. Furthermore, the results of similar investigation performed on solid UPDs [12][13][14][23][24][25][26][27]] cannot be applied here as normal loads and contact conditions of solid and flexible dampers differ.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Testing Friction Flexible Dampers: Challenges and Peculiarities

2018

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This paper deals with the dynamic of blades with strip dampers. The purpose is 1) to present the results of the dynamic numerical calculation, 2) to demonstrate the need for the experimental data on the blade-strip contact to be used as input to the calculation, 3) to propose a new test rig design to obtain them and 4) to test the key components of the new test rig. The forced responses of two blades coupled by a strip damper are calculated at different excitation and centrifugal force values. The dependence of the numerical results on the contact parameter values is confirmed in this significant reference case. The design of a new test rig is then proposed: both the blade frequency response function and the contact hysteresis cycles at the blade-strip contact are measured. It is shown how contact parameters can then be derived from experimental data. The main novelty of the test rig here proposed is the strip loading system, which simulates the uniform pressure distribution provided by the centrifugal force in real operating conditions. This loading system is non-contact and uses compressed air. Classical loading systems which see dead weights directly connected to the strip are assessed and their expected inadequacy is confirmed. The compressed air system is tested by measuring the pressure produced between strip and blades: pressure is uniform across the contact patch, constant in time and its mean value corresponds to realistic pressure values actually experienced by strip dampers during service.

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Section: Introductionmentioning

confidence: 99%

Modeling and Testing Friction Flexible Dampers: Challenges and Peculiarities

2018

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“…where E and ν are Young's modulus and Poisson ratio of the material, respectively. where ⊗ is the discrete convolution product and K zz (i, j) are the discrete influence coefficients [25] which are used to obtain the normal displacement resulting from unit pressure on the element (i, j).…”

Section: (C) Contact Analysismentioning

confidence: 99%

“…The entire process is repeated until either the criterion of the maximum number of cycles or total wear volume is met. Unlike the initial study performed in [25], the introduction of roughness at the contact interface in the present work allows the extraction of the contact stiffness values from the contact solver, which are then used to calibrate the penalty coefficients of the dynamic contact elements. Therefore, the stiffness distribution can be updated at each iteration as part of the multi-scale strategy, which is different compared to [25], where this distribution was assumed to be constant at the interface, and not evolving with the progression of wear.…”

Section: (E) Multi-scale Analysismentioning

confidence: 99%

A modelling approach for the nonlinear dynamics of assembled structures undergoing fretting wear

et al. 2019

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Assembled structures tend to exhibit nonlinear dynamic behaviour at high excitation levels due to the presence of contact interfaces. The possibility of building predictive models relies on the ability of the modelling strategy to capture the complex nonlinear phenomena occurring at the interface. One of these phenomena, normally neglected, is the fretting wear occurring at the frictional interface. In this paper, a computationally efficient modelling approach which enables considerations of the effect of fretting wear on the nonlinear dynamics is presented. A multiscale strategy is proposed, in which two different time scales and space scales are used for the contact analysis and dynamic analysis. Thanks to the decoupling of the contact and dynamic analysis, a more realistic representation of the contact interface, which includes surface roughness, is possible. The proposed approach is applied to a single bolted joint resonator with a simulated rough contact interface. A tendency towards an increase of real contact area and contact stiffness at the interface is clearly observed. The dynamic response of the system is shown to evolve over time, with a slight decrease of damping and an increase of resonance frequency, highlighting the impact of fretting wear on the system dynamics.

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“…As discussed earlier, it is necessary to account for variable contact stiffness across the contact area in order to obtain a more accurate prediction of the nonlinear response of a friction joint system. In the multiscale approach that is proposed here, the local contact stiffness is computed using a Boundary-Element -Method-based contact solver previously developed and validated by the authors [40,41].…”

Section: Multiscale Approach For Variable Contact Stiffnessmentioning

confidence: 99%

On the effects of roughness on the nonlinear dynamics of a bolted joint: A multiscale analysis

Armand

Salles

Schwingshackl

et al. 2018

European Journal of Mechanics - A/Solids

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Accurate prediction of the vibration response of friction joints is of great importance when estimating both the performance and the life of build-up structures. The contact conditions at the joint interface, including local normal load distribution and contact stiffness, play a critical role in the nonlinear dynamic response. These parameters strongly depend on the mating surfaces, where the surface roughness is well known to have a significant impact on the contact conditions in the static case. In contrast, its effects on the global and local nonlinear dynamic response of a build-up structure is not as well understood due to the complexity of the involved mechanisms. To obtain a better understanding of the dependence of the nonlinear dynamic response on surface roughness, a newly proposed multiscale approach has been developed. It links the surface roughness to the contact pressure and contact stiffness, and in combination with a multiharmonic balance solver, allows to compute the nonlinear dynamic response for different interface roughness. An application of the technique to a single bolted lap joint highlighted a strong impact of larger roughness values on the pressure distribution and local contact stiffness and in turn on the nonlinear dynamic response.

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A Multiscale Approach for Nonlinear Dynamic Response Predictions With Fretting Wear

Cited by 24 publications

References 23 publications

Modeling and Testing Friction Flexible Dampers: Challenges and Peculiarities

Modeling and Testing Friction Flexible Dampers: Challenges and Peculiarities

A modelling approach for the nonlinear dynamics of assembled structures undergoing fretting wear

On the effects of roughness on the nonlinear dynamics of a bolted joint: A multiscale analysis

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