Effects of localized geometric imperfections on the stress behavior of pressurized cylindrical shells

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Title: Effects of localized geometric imperfections on the stress behavior of pressurized cylindrical shells
Author: Rinehart, Adam James
Abstract: The influence of dent imperfections on the elastic stress behavior of cylindrical shells is explored . This problem is of central importance to the prediction of fatigue failure due to dents in petroleum pipelines . Using an approximate technique called the Equivalent Load Method , a semi -analytical model of two -dimensional dent stress behavior is developed . In the three -dimensional situation , decreased dent localization , in particular dent length , and increased dent depth are confirmed to cause dent stress concentration behavior to shift from having a single peak at the dent center to having peaks at the dent periphery . It is demonstrated that the equivalent load method does not predict this shift in stress behavior and cannot be relied upon to analyze relatively small , deep imperfections . The two stress modes of dents are associated with two modes of dent fatigue behavior that have significantly different fatigue lives . A method for distinguishing longer lived Mode P dents from shorter lived Mode C dents based on two measured features of dent geometry is developed and validated . An approach for implementing this analysis in the evaluation of real dents is also suggested .
URI: http : / /hdl .handle .net /1969 .1 /37
Date: 2004-09-30

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Effects of localized geometric imperfections on the stress behavior of pressurized cylindrical shells. Available electronically from http : / /hdl .handle .net /1969 .1 /37 .

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