Bolted joint; Elastic rough contact; Nonlinear dynamics; Accurate prediction; Contact conditions; Contact stiffness; Interface roughness; Multi scale analysis; Multi-scale approaches; Rough contact; Vibration response; Materials Science (all); Mechanics of Materials; Mechanical Engineering; Physics and Astronomy (all)
Abstract :
[en] 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.
Disciplines :
Mechanical engineering
Author, co-author :
Armand, J.; Imperial College London, London, United Kingdom
Salles, Loïc ; Université de Liège - ULiège > Aérospatiale et Mécanique (A&M) ; Imperial College London, London, United Kingdom
Schwingshackl, C.W.; Imperial College London, London, United Kingdom
The authors are grateful to Innovate UK and Rolls-Royce plc for providing the financial support for this work and for giving permission to publish it. This work is part of a collaborative R&T project 'sILOET II Project 10’ which is co-funded by Innovate UK and Rolls-Royce plc and carried out by Rolls-Royce plc and the Vibration UTC at Imperial College London.The authors are grateful to Innovate UK and Rolls-Royce plc for providing the financial support for this work and for giving permission to publish it. This work is part of a collaborative R&T project ‘SILOET II Project 10’ which is co-funded by Innovate UK and Rolls-Royce plc and carried out by Rolls-Royce plc and the Vibration UTC at Imperial College London.
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