J and CTOD estimation equations for shallow cracks in single edge notch bend specimens
- Univ. of Illinois, Urbana, IL (United States). Dept. of Civil Engineering
Fracture toughness values determined using shallow cracked single edge notch bend, SE(B), specimens of structural thickness are useful for structural integrity assessments. Results from two dimensional plane strain finite-element analyses are used to develop J and CTOD estimation strategies appropriate for application to both shallow and deep crack SE(B) specimens. Crack depth to specimen width (a/W) ratios between 0.05 and 0.70 are modelled using Ramberg-Osgood strain hardening exponents (n) between 4 and 50. The estimation formulas divide J and CTOD into small scale yielding (SSY) and large scale yielding (LSY) components. For each case, the SSY component is determined by the linear elastic stress intensity factor, K[sub I]. The formulas differ in evaluation of the LSY component. The techniques considered include: estimating J or CTOD from plastic work based on load line displacement (A[sub pl/LLD]), from plastic work based on crack mouth opening displacement (A[sub pl/CMOD]), and from the plastic component of crack mouth opening displacement (CMOD[sub pl]). A[sub pl/CMOD] provides the most accurate J estimation possible.
- Research Organization:
- Nuclear Regulatory Commission, Washington, DC (United States). Div. of Engineering; Illinois Univ., Urbana, IL (United States). Dept. of Civil Engineering; Naval Surface Warfare Center, Annapolis, MD (United States). Carderock Div.
- Sponsoring Organization:
- NRC; Nuclear Regulatory Commission, Washington, DC (United States)
- OSTI ID:
- 6310496
- Report Number(s):
- NUREG/CR-5969; UILU-ENG--91-2013; CDNSWC/SME-CR--17-92; ON: TI93018015
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360603 -- Materials-- Properties
BENDING
CALCULATION METHODS
COMPUTERIZED SIMULATION
CRACK PROPAGATION
CRACKS
DEFORMATION
FINITE ELEMENT METHOD
FRACTURE MECHANICS
FRACTURE PROPERTIES
HARDENING
MECHANICAL PROPERTIES
MECHANICS
NOTCHES
NUMERICAL SOLUTION
PLATES
SIMULATION
STRAIN HARDENING
TENSILE PROPERTIES