Didukh I. An estimation of the life time of tubular structural elements at the stage of fatigue surface cracks propagation

Українська версія

Thesis for the degree of Candidate of Sciences (CSc)

State registration number

0403U000343

Thesis Registration Form

0403U000343.pdf

Applicant for

Specialization

  • 01.02.04 - Механіка деформівного твердого тіла

27-12-2002

Specialized Academic Board

Д 35.226.02

Karpenko Physico-Mechanical Institute of NASU

Essay

The dissertation is devoted the problems of assessing the life time of tubular structural elements at the stage of surface cracks propagation under cyclic loading effect with account of residual stresses. The mathematical model is based on a partial differential equation to determine the kinetics of fatigue cracks in a three-dimensionаl elastoplatic body under high-cycle or low-cycle fatigue. In this equation, the basic parameter, responsible for crack growth rate, is the effective crack tip opening displacement range. To investigate the fatigue crack growth kinetics in structural elements, in dependence on stress ration using the proposed differential equation, it is sufficient to use the diagram of fatigue fracture alone for a certain value of stress ratio, thus allowing us to save the materials and time of experimental investigations for construction of fatigue curves.The residual life time and growth of fatigue surface semi- elliptical cracks for such structural elements as: thick-walled pipers; tubular welded joints of marine stationary platforms, tubular elements of equipment for extracting mineral resources from the ocean bottom have been assessed

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