NDLI: Prediction of Initiation Toughness Under Small Scale Yielding (SSY) and J0.2BL vs. Q Fracture Locus Using Local Approach Methodologies in 304SS

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Wasylyk, A. Sherry, A. H. Sharples, J. K.
Copyright Year	2012
Abstract	Structural integrity assessments of structures containing defects require valid fracture toughness properties as defined in national and international test standards. However, for some materials and component geometries, the development of valid toughness values — particularly for ductile fracture — is difficult since sufficiently large specimens cannot be machined. As a consequence, the validity of fracture toughness properties is limited by the development of plasticity ahead of the crack tip and the deviation of crack tip conditions at failure from small scale yielding. This paper described the use of local approach models, calibrated against invalid test data, to define initiation toughness in 304 stainless steel pipe material. Three fracture toughness geometries were tested, shallow cracked single edge cracked specimens tested under three point bending, deep cracked single edge cracked specimens tested under three point bending, and deep cracked single edge cracked specimen tested under tension. Initiation toughness and J-Resistance curves were defined for each specimen using the multi-specimen technique. All initiation toughness values measured were above the specimen validity limits. The fracture conditions at initiation were analysed using three local approach models: the Generalised Rice & Tracey, High Constraint Rice & Tracey and the Work of Fracture. The adequacy of local approaches to define the fracture conditions under large strains in 304 stainless steels was demonstrated. A modified boundary layer analysis combined with the local approach models was used to predict the “valid” initiation toughness under small scale yielding condition in this material by defining a J-Q fracture locus. The analytically derived fracture locus was compared to the J-Q values obtained experimentally and shown to be consistent.
Sponsorship	Pressure Vessels and Piping Division
Starting Page	473
Ending Page	480
Page Count	8
File Format	PDF
ISBN	9780791855027
DOI	10.1115/PVP2012-78770
Volume Number	Volume 3: Design and Analysis
Conference Proceedings	ASME 2012 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2012-07-15
Publisher Place	Toronto, Ontario, Canada
Access Restriction	Subscribed
Subject Keyword	Fracture (process) Stainless steel Plasticity Ductile fracture Tension Fracture (materials) Pipes Boundary layers Failure Fracture toughness
Content Type	Text
Resource Type	Article

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