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A Proposal for Two Characteristic Ratios of ASTM-CTOD to BS-CTOD
Materials Science Forum, 2010There have been two different CTOD calculations, geometric CTOD calculation in BS7448 and J-based conversion in ASTM E1290 since the ASTM International revised E1290 in 2002, and it is useful to transform one CTOD into the other CTOD. In this study, analytical and experimental investigations into the ratio of ASTM E1290-CTOD to BS7448-CTOD were carried
Yoichi Kayamori +2 more
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Equivalent CTOD Ratio β for Engineering Assessment of CTOD Correction for Constraint Loss
Volume 1: Codes and Standards, 2008The critical CTOD δWP for structural components associated with plastic constraint loss in case of the brittle fracture over small-scale yielding condition can be corrected from CTOD fracture toughness δ by means of the “equivalent CTOD ratio β” defined as δ/δWP, which is based on the Weibull stress criterion. In this study, taking the case of specific
Mitsuru Ohata, Fumiyoshi Minami
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CTOD estimates of surface cracked wide plates in bending—II. Level-3 CTOD method
Engineering Fracture Mechanics, 1991Abstract The Welding Institute Level-3 crack tip opening displacement (CTOD) method was expanded to be applicable to plane strain (Plane-strain Level-3 CTOD method). The definition of the reference strain is a major source of uncertainty in the application of the Level-3 CTOD method.
Fujikubo Masahiko +2 more
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A Comparison Between BS7448-CTOD and ASTM E1290-CTOD in Linepipes
Volume 6: Materials Technology; C.C. Mei Symposium on Wave Mechanics and Hydrodynamics; Offshore Measurement and Data Interpretation, 2009ASTM E1290 previously used the plastic hinge model for the calculation of CTOD, but has changed its CTOD calculation to J-based conversion since 2002. In this study, the ratio of ASTM-CTOD to BS-CTOD was analytically predicted and experimentally evaluated in linepipes. It was demonstrated that the CTOD ratio changed according to CTOD itself, and took a
Yoichi Kayamori +2 more
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Transformation of CTOD δ5 to CTOD δBS and J-integral for 3PB- and CT-specimens
Engineering Fracture Mechanics, 1999Abstract A two-region empirical formula is proposed for the transformation of crack tip opening displacement (CTOD) δ 5 to the standard CTOD δ BS and the J -integral. Coefficients of the approximation are fitted to data sets of three-dimensional elastic–plastic finite element solutions for plane side and side-grooved three-point bend and ...
G.P. Nikishkov +2 more
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1986
Experiences and test results of IWM concerning the fracture mechanics characterization of multipass submerged arc and manual metal arc welds in thick components of C-Mn, steel are described. The influences of materials, fabrication parameters and testing variables on the fracture toughness in terms of critical CTOD are discussed.
J. G. Blauel, W. Burget
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Experiences and test results of IWM concerning the fracture mechanics characterization of multipass submerged arc and manual metal arc welds in thick components of C-Mn, steel are described. The influences of materials, fabrication parameters and testing variables on the fracture toughness in terms of critical CTOD are discussed.
J. G. Blauel, W. Burget
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A stretched zone method for ctod evaluation
International Journal of Fracture, 1991where Aa=~. h is the length (or width) of the stretched zone. Conventionally, the deformed crack tip is considered to be of a semi-circular type leading to a blunting angle of 45 degrees. However, viewpoints contrary to this have been expressed [3-5].
R. K. Pandey, P. Sundaram, A. N. Kumar
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Proposal for a new CTOD calculation formula
Engineering Fracture Mechanics, 2016Abstract A new CTOD calculation method is investigated in this work, considering the variation of crack tip blunting due to strain hardening. The calculation formula is constructed assuming that CTOD 45FEM based on three-dimensional elasto-plastic FEM is the target CTOD to be calibrated. A new factor f is introduced to correct the plastic term. In
Tomoya Kawabata +11 more
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Problems of Numerical CTOD Anlayses
1986The interest of fracture mechanics research in CTOD (crack-tip opening displacement) results from its close relationship to the asymptotic strain field. In theoretical investigations a realistic CTOD may therefore depend on a representative strain field in the near-tip region.
H. Amstutz, T. Seeger
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Numerical determination of plastic
AbstractIn previous works, a da/dN versus plastic crack tip opening displacement model was proposed to study fatigue crack growth. The plastic crack tip opening displacement, δp, which quantifies the crack tip plastic deformation, is determined numerically using the finite element method.
F.V. Antunes +3 more
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