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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

Contributors

Ruiz, C. (Carlos)More by this contributor

RoleSupervisor

 

Dr. C. RuizMore by this contributor

RoleSupervisor

 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

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

Fuente: https://ora.ox.ac.uk/objects/uuid:28499f85-1968-412e-a139-e3f6bc6af439



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