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Reference: Hodkinson, Pauline H., (1978). Failure analysis of pressure vessels with defects. DPhil. University of Oxford.Citable link to this page:


Failure analysis of pressure vessels with defects

Abstract: A combined theoretical and experimental study of the criteria governingthe failure analysis of pressure vessels with defects has been performed.The fields of fracture mechanics (linear elastic and elastic-plasticbehaviour), failure governed by large scale plastic deformation and energybalance methods are critically reviewed. All three approaches are shownto have relevance in the complete failure analysis of a structure withdefects.An experimental study of the failure mechanisms of precracked polycarbonateand maraging steel plates and model polycarbonate vessels ispresented. Room temperature, static loading tests are performed on 85andnbsp;mmwide, 5andnbsp;mm thick compact specimens of polycarbonate (0.013 andle; aandfrasl;W andle; 0.810).For comparison, 51andnbsp;mm wide maraging steel compact specimens are monotonicallyloaded at room temperature. The influence of through-thicknessconstraint on the fracture toughness and slow crack growth characteristicsof the steel is investigated using plates of varying thickness (3.1andnbsp;mmandndash;25.4andnbsp;mm)and initial crack length (0.386 andle; aandfrasl;W andle; 0.766 for 3.1andnbsp;mm thicksheet); various ancillary studies (scanning electron microscopy, surfacedeformation studies) complement the results.The crack growth behaviour of longitudinal through (0.704 andle; c / andradic;DT/2andle; 1.434) and deep part-through (dandfrasl;T = 0.700 and 0.878) cracks in 50.8andnbsp;mm and102andnbsp;mm diameter (5andnbsp;mm and 6andnbsp;mm wall thickness) polycarbonate cylinders isalso studied.Bowling and Townley's two-criteria approach to failure i.e. LEFM onthe one hand and limit analysis on the other, is shown to provide a usefulmethod for assessing the relative importance of crack initiation, inthe presence of limited crack tip plasticity and general yield as failurecriteria for a given sized defect. Thus, for crack tip plasticity fullycontained by an outer elastic field i.e. not general yield, the LEFMparameter, KIc (with the possibility of a plasticity correction factorfor thin sheet) can be used to predict crack initiation. For the lowstrain-hardening maraging steel, Irwin's plane strain plasticity correction,1andfrasl;6andpi; (KIc/andsigma;y)2 is shown to be applicable to sheet thicknesses comparableto 1andfrasl;andpi; (KIc/andsigma;y)2 i.e. twice Irwin's plane stress plastic zone radius.

Type of Award:DPhil Level of Award:Doctoral Awarding Institution: University of Oxford Notes:This thesis was digitised thanks to the generosity of Dr Leonard Polonsky


Ruiz, C. (Carlos)More by this contributor



Dr. C. RuizMore by this contributor


 Bibliographic Details

Issue Date: 1978Identifiers

Urn: uuid:28499f85-1968-412e-a139-e3f6bc6af439

Source identifier: 603839989 Item Description

Type: Thesis;

Language: eng Subjects: Pressure vessels Materials Fatigue Fracture mechanics Tiny URL: td:603839989


Autor: Hodkinson, Pauline H. - institutionUniversity of Oxford facultyMathematical and Physical Sciences Division - - - - Contributors R



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