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Title: The elastic-plastic behaviour of pipe bends subjected to cyclic loading
Author: Blomfield, J.
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1970
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The research work described in this thesis was directed towards attempting to solve the problem of predicting the elastic-plastic behaviour of pipe bends subjected to in-plane bending and internal pressure and to relate the results to the failure of bends due to low cycle fatigue. To this end a survey of the elastic theories of pipe-bends was conducted which resulted in the problem being expressed in terms of thin shell theory. A comparison of the rival methods of elastic-plastic stress and strain analysis was made and an improved theoretical presentation of these methods is proposed to aid future understanding and discussion. Tests using strain gauges on full size pipe bend specimens were conducted in order to measure and compare theoretically predicted elastic-plastic strains based upon cyclic stress-strain curves. The pipe bends were cycled until fatigue occurred and the results compared with the failures that occur in small fatigue specimens. Finally the ways in which the above results could be used in design procedures is discussed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available