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Ductile fracture theories for pressurised pipes and containersTwo mechanisms of fracture are distinguished. Plane strain fractures occur in materials which do not undergo large-scale plastic deformations prior to and during a possible fracture deformation. Plane stress or high energy fractures are generally accompanied by large inelastic deformations. Theories for analyzing plane stress are based on the concepts of critical crack opening stretch, K(R) characterization, J-integral, and plastic instability. This last is considered in some detail. The ductile fracture process involves fracture initiation followed by a stable crack growth and the onset of unstable fracture propagation. The ductile fracture propagation process may be characterized by either a multiparameter (discrete) model, or some type of a resistance curve which may be considered as a continuous model expressed graphically. These models are studied and an alternative model is also proposed for ductile fractures which cannot be modeled as progressive crack growth phenomena.
Document ID
19770053550
Document Type
Reprint (Version printed in journal)
Authors
Erdogan, F. (Lehigh University Bethlehem, Pa., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1976
Publication Information
Publication: International Journal of Pressure Vessels and Piping
Volume: 4
Subject Category
STRUCTURAL MECHANICS
Funding Number(s)
CONTRACT_GRANT: NSF GK-42771X
CONTRACT_GRANT: NGR-39-007-011
Distribution Limits
Public
Copyright
Other