Nonlinear Dynamic Analysis of Bolted Joints: Detailed and Equivalent Modelling

Research output: Chapter in Book/Report/Conference proceedingChapter

Authors

  • N. Jamia
  • H. Jalali
  • J. Taghipour
  • M. I. Friswell
  • H. H. Khodaparast

Details

Original languageEnglish
Title of host publicationNonlinear Structures and Systems, Volume 1 - Proceedings of the 38th IMAC, A Conference and Exposition on Structural Dynamics, 2020
EditorsGaetan Kerschen, Matthew R.W. Brake, Ludovic Renson
PublisherSpringer
Pages215-221
Number of pages7
ISBN (Print)9783030476250, 9783030476267
DOIs
Publication statusPublished - 13 Sep 2021

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652
Publication type

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

A standard finite element analysis of individual components in aero engine and other systems shows a high accuracy compared to experimental measurements of the system response. However when it comes to assemblies, the conventional linear approaches fail to deliver good accuracy. This is due to the uncertain physical phenomena in the contact interface of the joints. A nonlinear contact problem is introduced by the joint and influences the overall dynamic behavior of the engine assembly. Therefore, the linear dynamic models must be coupled with nonlinear analysis of the assembly to investigate the accurate dynamics of the nonlinear system. Flanges are widely used joints that represent the main source of nonlinearities in assemblies. In this study, a finite element simulation of two bolted flanges is considered to identify the nonlinear behavior of the bolted flange joint caused by the presence of friction in contact interfaces. A detailed model of a bolted joint was built in ANSYS in order to evaluate the energy dissipated in a bolted joint and therefore provide accurate modeling of joint interfaces. Due to the high cost of the detailed model, an equivalent model was derived and predictions from this model are compared to the detailed model results in order to provide a robust model for designing bolted joints.