Effective tearing modulus: a model for brittle fracture and tearing instability
Technical Report
·
OSTI ID:6022897
The objective of this study was to determine a model for the transition regime and upper shelf fracture resistance of low-strength/high-toughness structural steels. The success of the model was measured in two ways: (1) the condition for fracture specimen maximum load, intersection of applied and material effective tearing modulus curves, was satisfied for compact tension data in the transition and upper shelf fracture regimes; (2) maximum load attained by surface-flawed intermediate test vessels (ITV's) was accurately calculated by using the model and associated compact tension data. The fracture model attribute of stress-dependent plastic zone constraint was thought to be primarily responsible for its thickness insensitivity. Metallurgical fracture mode insensitivity of the model in the transition regime was thought to be primarily due to the use of a plastic zone addition to the physical crack size. Calculation of the fracture model parameters (crack driving/resistance forces and their derivatives with respect to the plastic-zone-corrected crack) was enhanced by the availability of and relationship to linear elastic fracture mechanics formulas. Ligament size criteria consistent with the fracture model were determined empirically for the compact tension specimen. Pressure vessel analyses indicated that model accuracy was acceptable provided that the average hoop stress was less than the yield stress.
- Research Organization:
- Knolls Atomic Power Lab., Schenectady, NY (USA)
- DOE Contract Number:
- AC12-76SN00052
- OSTI ID:
- 6022897
- Report Number(s):
- KAPL-4190; ON: DE86008785
- Country of Publication:
- United States
- Language:
- English
Similar Records
A Unified Cohesive Zone Approach to Model Ductile Brittle Transition in Reactor Pressure Vessel Steels
Computer model for ductile fracture: applications to the Charpy V-notch test. Phase one report
Calculating the tearing resistance of ductile steels: Final report
Journal Article
·
Fri Aug 01 00:00:00 EDT 2014
· Engineering Fracture Mechanics
·
OSTI ID:1162202
Computer model for ductile fracture: applications to the Charpy V-notch test. Phase one report
Technical Report
·
Sun Dec 31 23:00:00 EST 1978
·
OSTI ID:6518272
Calculating the tearing resistance of ductile steels: Final report
Technical Report
·
Mon May 01 00:00:00 EDT 1989
·
OSTI ID:6238978