High temperature fastener fatigue

Update item information
Publication Type thesis
School or College College of Engineering
Department Mechanical Engineering
Author Hobbs, James Mark
Title High temperature fastener fatigue
Date 2010-08
Description This work was commissioned in response to high temperature fatigue failures in a bolted connection that rotates at high speed. There was concern about the loss of preload in the fasteners at high temperature due to thermal expansion in the fasteners. A substitution of fastener material was made and the failures ceased. The two major focuses of this work are preload and fatigue behavior of fasteners. Preload can be determined by many different methods with varying degrees of accuracy. After investigating and testing different methods of measuring preload, a new method is proposed herein that is application specific, eliminating the need for many of the assumptions common to other methods. Modeling and testing also confirmed that the preload of original fasteners was being completely lost at elevated temperature, and the new fasteners were maintaining preload. Fatigue testing was also performed on the fasteners to determine the fatigue behavior of the fasteners and the effects of temperature on fatigue life. It was determined that maintaining preload at temperature is the most important factor on fastener life in this application, and that temperature does not have great effect over the temperature range considered.
Type Text
Publisher University of Utah
Subject Fastener; Fatigue; High temperature; Measurement; Preload
Subject LCSH Bolts and nuts -- Fatigue; Bolts and nuts -- Thermal fatigue
Dissertation Institution University of Utah
Dissertation Name MS
Language eng
Rights Management ©James Mark Hobbs
Format Medium application/pdf
Format Extent 10,819 bytes
Identifier us-etd2,161971
Source Original in Marriott Library Special Collections, TA7.5 2010.H63
ARK ark:/87278/s6862ww7
Setname ir_etd
Date Created 2012-04-23
Date Modified 2017-08-30
ID 192137
Reference URL https://collections.lib.utah.edu/ark:/87278/s6862ww7