The paper presents a review of the actual situation on the knowledge of the ductile fracture propagation (DFP) control in very high strength, large diameter pipes tested at high hoop stresses, especially in the light of the recent years activity performed by CSM in cooperation with qualified pipe producers and gas companies. The results obtained in a series of full scale tests which demonstrate the good performance of X70 - X100 grade steels are first analysed in terms of traditional fracture parameters, such as the Charpy-V energy used so far for lower strength materials, without much success. Then recent efforts in the development of a 3D-FEM physical model based on CTOA ( Crack Tip Opening Angle) including a process zone associated with the crack tip and the constraint effects due to the soil backfill are also illustrated in conjunction with the first promising results obtained.
Designing against ductile fracture propagation in very high strength steel gas pipelines: A review
Vermeidung der duktilen Bruchfortschreitung in hochfesten Stählen für Gaspipelines durch geeignete Konstruktion: Eine Übersicht
2000
18 Seiten, 19 Bilder, 20 Quellen
Aufsatz (Konferenz)
Englisch
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