Showing papers in "International Journal of Pressure Vessels and Piping in 1996"

TL;DR: In this paper, free vibrations of a thin circular-cylindrical shell in contact with an elastic medium are investigated, employing membrane theory, and the response of the elastic medium is represented by Winkler/Pasternak models.

TL;DR: In this article, a probabilistic method for the assessment of the suitability of corroded pipelines under pressure loading is described, taking into account the uncertainties of the variables that influence suitability.

TL;DR: In this article, a general analytical solution for an infinite elastic plate with a traction-free elliptic hole subjected to arbitrary biaxial loading is presented. But this solution is not suitable for the case of thin-walled cylindrical pressure vessels.

TL;DR: In this article, the effects of specimen thickness on crack tip deformation and fatigue crack growth rate (FCGR) were investigated on the specimens of Type 304 stainless steel and Inconel 718.

TL;DR: Comparisons show that recently proposed assessment methods are a singificant improvement in safety and accuracy over older techniques, and commonly used conditions for the assessment of non-coplanar cracks are shown to be unsafe.

TL;DR: In this article, the mechanisms of damage occurring in reformer furnace tubes are discussed, together with the methods of assessing the extent of damage and remaining life and the use of characteristic curves is described, these illustrating the extent and accumulated damage by creep.

TL;DR: In this article, the results of a series of burst tests on pipe-containing corrosion pits lying on a longitudinal axis are summarized and the finite element method is used to analyze the test data and to investigate geometric parameters not considered experimentally.

TL;DR: In this paper, the feasibility of producing the so-called "black/white joints" (ferritic/austenitic dissimilar steel joints) by laser beam welding (LBW) is discussed.

TL;DR: In this article, a simple technique called the elastic compensation method developed previously by Mackenzie & Boyle is used in combination with full-dimensional finite-element analysis to obtain limit and shakedown interaction diagrams for nozzle/cylinder intersections subject to combined internal pressure and in-plane nozzle moment loading.

TL;DR: In this article, the Mossgas plant converts natural gas from sub-sea wells located 85 km south of Mossel Bay, to synthetic fuels by reaction with steam and oxygen at very high temperatures over a nickel catalyst in the secondary reformer.

TL;DR: In this paper, a numerical model was developed for the computation of creep damages in a thick-walled tube subjected to an internal pressure and a thermal gradient, and the model predicts the changes in the creep damage rates during the life of the tube due to variation in stresses with time and through-thickness variations.

TL;DR: In this paper, a finite-volume procedure for determining the displacement fields and elastic stress distributions within structures that have axisymmetric geometries is presented, where an iterative technique is employed to solve these equations and provide the displacement field from which the strain and stress fields can be found.

TL;DR: In this paper, the inviscid fluid-dynamic forces acting on a pipe due to internal fluid flow are approximated by the plug-flow model with the slender-body theory.

TL;DR: In this paper, the effect of mechanical heterogeneity in welded joints on the fatigue damage behaviour and fatigue crack initiation life was also investigated, and the results indicated that the fatigue behaviour is markedly different in three zones of welded joint; there is a trend toward reduction in the fatigue life of HAZ as compared with the base metal.

TL;DR: In this article, a method was developed that allows the material constants of complex creep constitutive equations to be determined from the knowledge of the constitutive equation of a base material, and a set of normalized material property ratios.

TL;DR: In this article, the main features of two of the most widespread problems, namely intergranular stress corrosion cracking of sensitized stainless steel piping in boiling water reactors and of nickel alloy steam generator tubes in pressurized water reactors, are described together with remedial measures and crack growth models applicable to in-plant components.

TL;DR: In this paper, the fracture toughness of wrought and welded Type 316 material in long-term thermally aged and irradiated conditions was examined and the results indicated that whilst potentially detrimental microstructural changes have occurred during ageing, the degradation in mechanical properties is not large.

TL;DR: In this paper, three-dimensional finite element analyses have been conducted to calculate the stress intensity factors for internal and external low aspect ratio longitudinal semi-elliptic cracks in pipes with a ratio of internal radius to thickness of 10.

TL;DR: In this article, a simplified one-dimensional frost heave model was used to evaluate frost-heave, and a beam on elastic foundation finite element was employed to model the buried pipeline and determined the time-dependent creep displacements of frozen soil based on the elastic theory for the multi-layer half space.

TL;DR: In this article, the suitability of current small-scale tests to characterise the crack arrest behavior of structures is assessed and it is concluded that the "Pellini" drop-weight test is the most suitable test available at present to characterize structural crack arrest behaviour.

TL;DR: In this article, both full scale seam welded pipes and cross-weld specimens are studied with the damage mechanics concept using finite element, FE, technique, and the same mechanical model of multiple material zones is used for the two components.

TL;DR: In this article, a concept of structural creep-rupture strength is proposed to define the weldment creep strength reduction factor, and a damage mechanics approach is introduced to study the life reduction and ductility reduction due to the presence of a weld in structures at high temperature.

TL;DR: In this article, the stiffness and force matrices of a shell under distributed and concentrated loads and temperature gradient on distributed or concentrated elastic foundations are derived using the variational approach and a solution algorthm is proposed and applied to investigate the nature and variations of stresses produced in cylindrical shells with spherical and torospherical heads.

TL;DR: In this article, the authors provided the ratchetting rates for a series of carbon steel and stainless pressurised piping elbows when subjected to in-plane simulated seismic bending moments.

TL;DR: In this paper, the phenomenon of fatigue crack retardation, due to variable single peak overloads in IS-1020 steel, was studied and a single power law was developed to predict the delay period for a particular overload ratio.

TL;DR: A bibliographical review of the finite element methods applied for the analysis of pressure vessel structures/components and piping from the theoretical as well as practical points of view is given in this article.

TL;DR: In this paper, surface and through thickness residual stress measurements were performed on an aged cast austenitic-ferritic stainless steel pipe and on an orbital TIG weld representative of those of primary coolant pipes in pressurized water reactors.

TL;DR: In this paper, the authors reported the RTNDT and KId results obtained from instrumented impact and drop-weight tests of 9Cr1Mo welds, which were obtained using electrodes of diameter 2-5, 3-15 and 4-mm.

TL;DR: In this paper, a simple method of deriving lower bound limit loads for thin shell structures is presented, based on the method of elastic compensation, previously developed by Mackenzie and Boyle, which is here extended to thin shell finite-element analysis using generalised yield criteria.

TL;DR: In this paper, the calculation of bolt forces in circular flange joints under tension has been studied and tables and a chart are created to simplify their use for the design of bolt and flange in the joints.