Nonlinear Joint Model Updating in Assembled Structures

Dynamic response of mechanical structures is significantly affected by joints. Joints introduce remarkable frictional damping and localized flexibility to the structure; hence, to obtain a more accurate representation of a system's dynamics, it is crucial to take these effects into account. This paper investigates the application of finite-element model updating on characterization of a nonlinear joint interface. A thin layer of virtual elements is used at a joint location to represent the nonlinear behavior of the coupling in the tangential direction. The material properties of the elements are described by a nonlinear constitutive stress-strain equation that defines the nonlinear state of the joint interface. In this study, Richard–Abbot elastic-plastic material was considered, which is capable of characterizing energy dissipation and softening phenomena in a joint at a nonlinear state. Uncertain material parameters are adjusted to minimize the residual between the numerical and experimental nonlinear frequency responses. Minimization was carried out based on iterative sensitivity-based optimization. The procedure was implemented on an assembled structure consisting of two steel threaded pipes coupled to each other by a nut interface. It was demonstrated that the proposed technique significantly reduced the uncertainties in the joint modeling and led to a more reliable description of the assembled structure.

• Record URL:
  • https://doi.org/10.1061/(ASCE)EM.1943-7889.0000759
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/07339399
• Supplemental Notes:
  • © 2014 American Society of Civil Engineers.
• Authors:
  • Alamdari, Mehrisadat Makki
  • Li, Jianchun
  • Samali, Bijan
  • Ahmadian, Hamid
  • Naghavi, Ali
• Publication Date: 2014-7

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: 04014042
• Serial:
  • Journal of Engineering Mechanics
  • Volume: 140
  • Issue Number: 7
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9399
  • EISSN: 1943-7889
  • Serial URL: http://ascelibrary.org/journal/jenmdt

Subject/Index Terms

• TRT Terms: Damping (Engineering); Finite element method; Joints; Nonlinear equations; Properties of materials; Resistance (Mechanics); Structures
• Subject Areas: Bridges and other structures; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 01515016
• Record Type: Publication
• Files: TRIS, ASCE
• Created Date: Feb 21 2014 3:16PM