AN EXPERIMENTAL STUDY ON THE RELAXATION OF BOLTS

Authors

  • Muhammad Abid Interdisciplinary Research Center, COMSATS Institute of Information Technology, Wah Cantt
  • Muhammad Shahid Khalil Department of Mechanical Engineering, University of Engineering and Technology, Taxila,
  • Hafiz Abdul Wajid Department of Mathematics, COMSATS Institute of Information Technology, Lahore Department of Electrical Engineering, Islamic University Medina, KSA

DOI:

https://doi.org/10.31436/iiumej.v16i1.539

Abstract

Loss of pre-load with time, commonly known as ‘Relaxation’ is an established phenomena. Behaviour of a bolted joint depends upon the pre-load in the bolts in use, not the pre-load introduced by the mechanic. Loss of pre-load is expected due to the many factors such as embedment relaxation, gasket creep, elastic interactions, and vibration loosening or stress relaxation. In a gasketed joint, due to the gasket flexibility, relaxation is always substantial during preliminary passes, as 80 to 100% loss is not uncommon in almost all the bolts, resulting in a dynamic behaviour. Pre-load in a gasketed joint is stabilized and retained to certain extent in the final passes only. In a non-gasketed joint, due to no gasket and no rotation its static behaviour is concluded. This paper highlights the factors affecting the amount of relaxation with time and presents important considerations that can reduce this. Both the short and long term relaxations are recorded and a ‘best fit’ model for relaxation behaviour is derived.

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Published

2015-05-26

How to Cite

Abid, M., Khalil, M. S., & Wajid, H. A. (2015). AN EXPERIMENTAL STUDY ON THE RELAXATION OF BOLTS. IIUM Engineering Journal, 16(1). https://doi.org/10.31436/iiumej.v16i1.539

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