Heath, Thomas V. (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 (PhD)
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Library of Congress Subject Headings (LCSH):	Bolted joints
Official Date:	June 1974
Dates:	Date Event June 1974 Submitted
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Publication Status:	Unpublished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

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