... or geometrical stress raisers can initiate fatigue cracks, causing the columns or pipelines to fail prematurely. In order to investigate the fatigue behavior of pipe joints, a resonant bending fatigue setup was designed, suitable for testing pipes within a diameter range from 6 in. to 20 in. In this setup...

... material was tested in a sour environment with initial flaw sizes in the range 1–2 mm. Fatigue crack growth rate tests have been performed to investigate the influence of crack depth on crack growth rate ( d a / d N ) . Initial results suggest that crack growth rates for deep flaws can increase by a factor...

... but that were identified prone to fatigue cracking in a stress assessment analysis under new service conditions. Credit on fatigue life in various codes and results from experimental data obtained from fatigue tested specimens with a controlled weld toe profile are given. Comments on the design of a controlled...

... found that stiffened panels are tolerant to fatigue cracking, the safety of such structural components with the presence of long cracks may be threatened when exposed to overload extreme conditions, i.e., brittle or ductile fracture may occur. The probability of brittle fracture of an aging hull...

... planning fatigue cracks risk analysis nondestructive testing mechanical engineering computing structural engineering interpolation Reliability- and risk-based inspection planning (RBI) for offshore facilities have been the issues of high practical interest for the offshore engineering...

... inspections and with inspection data make structural integrity assessments. The periodic inspection-assessment process can lead to the implementation of a fatigue crack repair by crack removal. Fracture mechanics analysis is used again to determine whether or not a repair will be effective. For the case...

... analyses performed upon five high strength steels fatigued in air and seawater are presented. These revealed fracture surface morphology distinctions that were a unique function of material, environment (air versus seawater), potential, and crack length, and that the enhanced fatigue crack growth rate...

... of environmental loading, assessment of defect tolerance using fatigue crack growth analysis is generally considered an important design parameter. In this paper, more than 60 crack growth data sets from 20 independent laboratories were collected and analyzed to develop crack growth rate equations for use...

... should be, to establish a certain residual fatigue life. [S0892-7219(00)00503-3] The fatigue cracks are back-calculated to the initial crack sizes. Furthermore, the ratio of fatigue cracks to fabrication cracks is considered. This ratio indicates the effective size of the hot spot area versus...

... reliability is investigated. It has been found that the updated system reliability is significantly affected by the inspection updating policy. Now with Brown & Root Energy Services, Halliburton AS, 4001 Stavanger, Norway Madsen, H. O., 1985, “Random Fatigue Crack Growth and Inspection...

...Inge Lotsberg; Gudfinnur Sigurdsson; Per Terje Wold Probabilistic methods has been used to develop a basis for an in-service inspection program for the Åsgard A FPSO hull structure with respect to fatigue cracks. Åsgard A is a floating production unit constructed for Statoil and was installed...