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Title: Some properties of bolted joints
Author: Heath, Thomas V.
ISNI:       0000 0001 3551 6638
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 1974
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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.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: TA Engineering (General). Civil engineering (General)