Heath, Thomas V., 1948- (1974) Some properties of bolted joints. PhD thesis, University of Warwick.

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Abstract

The roles of surface roughness and of surface flatness in determining the properties of structural joints are discussed. A method of measuring the effects of errors of form on joint stiffness is given. Measurements of the dynamic stiffness of annular bolted joints were taken for varying preloads and on joints with different surface finishes. Results obtained were of a form not previously seen. It was determined that the joint motion was the combination of a normal joint motion, which was uniform across the joint, and a dynamic deformation of the joint planforms resulting from the superimposition of a uniform dynamic load on to the non-uniform static joint preload provided by the bolts. This dynamic deformation varied as a function of position within the joint and in consequence the dynamic motion of the joint was not uniform with position. It was found that the phase relationship between the applied dynamic force and the resultant joint motion varied markedly with both bolt load and excitation frequency. A two degree of freedom mathematical model was developed to account for the unusual changes in the phase and magnitude of the dynamic joint stiffness, with these parameters. This model includes a negative stiffness. Experiments were performed to demonstrate the existence of this negative stiffness and a method was then developed for determining the static motion of a rectangular joint subjected to nonuniform loading.

Item Type:	Thesis or Dissertation (PhD)
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Library of Congress Subject Headings (LCSH):	Bolted joints
Date:	June 1974
Institution:	University of Warwick
Theses Department:	School of Engineering
Thesis Type:	PhD
Publication Status:	Unpublished
Supervisor(s)/Advisor:	Marples, V.
Extent:	110, [55] leaves
Language:	eng
URI:	http://wrap.warwick.ac.uk/id/eprint/34687

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