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Finite Element Stress Analysis and Strength Evaluation of Bonded Shrink Fitted Joints Under Impact Push-Off Loads

[+] Author Affiliations
Lijuan Liao, Toshiyuki Sawa

Hiroshima University, Higashihiroshima, Hiroshima, Japan

Paper No. IMECE2010-37213, pp. 9-20; 12 pages
doi:10.1115/IMECE2010-37213
From:
  • ASME 2010 International Mechanical Engineering Congress and Exposition
  • Volume 9: Mechanics of Solids, Structures and Fluids
  • Vancouver, British Columbia, Canada, November 12–18, 2010
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4446-5
  • Copyright © 2010 by ASME

abstract

Joints combining shrink fittings with anaerobic adhesives (bonded shrink fitted joints) have been appeared with advantages compared with those with shrink fittings only in light weight and high strength. This paper deals with the stress wave propagations and stress distributions of bonded shrink fitted joint in which a hollow cylinder is fitted at the middle part of a solid cylinder subjected to impact push-off loads with small strain rate. The stress stress wave propagations and stress distributions in bonded shrink fitted joint are analyzed in elastic and elasto-plastic deformation ranges using finite element method (FEM) as a four-body contact problem. The impact loads are applied to the joint by dropping a weight-hammer. The FEM code employed is ANSYS/LS-DYNA. The effects of the stiffness, the outside diameter and the height of hollow cylinder on the stress wave propagations at the interfaces are examined. The strength of the joint is clarified using the stress distributions obtained from numerical calculations. The normal stress near the upper edge of the outside interface of the adhesive layer increases as the rigidity and the outside diameter of the hollow cylinder decrease and the height of the hollow cylinder increases. The shear stress near the upper edge of the outside surface of the adhesive layer increases as the outside diameter and the height of the hollow cylinder increase; while it decreases as the rigidity of the hollow cylinder increases. The strength of bonded shrink fitted joint increases as the rigidity and the height of the hollow cylinder increase and the outside diameter of the hollow cylinder decreases. In addition, the characteristics of the joints subjected to impact loads are compared with those of the joints under static loads. It is observed that the characteristics of the joints subjected to impact loads are opposite to those subjected to static loads. Besides that, the attributes of the contact interface of shrink fitted joint under impact loads are compared with those of bonded shrink fitted joint under same external loads. It is found that opposite properties exist between of them. Furthermore, experiments are carried out to measure the strain response of bonded shrink fitted joints subjected to impact push-off loads. The numerical results are in a fairly good agreement with the experimental results and FEM results.

Copyright © 2010 by ASME

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