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Clamp Load Retention of Bolted Joints Under Alternating and Superposed Thermal Stress

[+] Author Affiliations
Markus Duchardt, Christina Berger, Ulrich Wuttke

Technische Universität Darmstadt, Darmstadt, Germany

Paper No. IMECE2011-63571, pp. 539-545; 7 pages
doi:10.1115/IMECE2011-63571
From:
  • ASME 2011 International Mechanical Engineering Congress and Exposition
  • Volume 3: Design and Manufacturing
  • Denver, Colorado, USA, November 11–17, 2011
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5489-1
  • Copyright © 2011 by ASME

abstract

Current efforts for using lighter materials are essentially determined by economic and ecological parameters. The automotive industry can expect a 8 to 10 percent improvement in fuel usage with a mere 10 percent reduction in vehicle weight. Lighter vehicles facilitate easier braking, and reduced collision impact, thereby creating a superior driving experience for consumers. Magnesium and aluminium alloys are common materials for a wide range of applications including engine and power train components, as well as under-hood applications with operating temperatures of up to 150°C. Today’s state-of-the-art joining method for lightweight materials is the use of aluminium fasteners. Several studies have been conducted to describe and analyze the static load behaviour of bolted joints; to date, however, the pre-load retention behaviour under alternating as well as superposed thermal stress has yet to be characterized. The current research project investigates effect of alternating stress on the bolted joint while also considering such variables as different material combinations, varying levels of load, and changes in temperature. Our main focus is on the embedding amounts and the surface pressure limits of the substrate(s), with special consideration made for time-dependent deformation mechanisms. Furthermore, based on the generated material parameters, the deformation behaviour will be reproduced and simulated.

Copyright © 2011 by ASME

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