Results 161 to 170 of about 1,592 (205)

CTOD Testing of Welds

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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Proposal for a new CTOD calculation formula

Engineering Fracture Mechanics, 2016
Abstract 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, Tetsuya Tagawa, Takahiro Sakimoto, Yoichi Kayamori, Mitsuru Ohata, Yoichi Yamashita, Ei-ichi Tamura, Hitoshi Yoshinari, Shuji Aihara, Fumiyoshi Minami, Hiroshi Mimura, Yukito Hagihara   +11 more
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A review of the CTOA/CTOD fracture criterion

Engineering Fracture Mechanics, 2003
Abstract The crack-tip-opening angle or displacement (CTOA/CTOD) fracture criterion is one of the oldest fracture criteria applied to fracture of metallic materials with cracks. During the past two decades, the use of elastic–plastic finite-element analyses to simulate fracture of laboratory specimens and structural components using the CTOA ...
J.C Newman, M.A James, U Zerbst
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A stretched zone method for ctod evaluation

International Journal of Fracture, 1991
where 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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Application of CTOD in atomistic modeling of fracture

Engineering Fracture Mechanics, 2015
Abstract In this presentation we first review a method to use crack tip displacements and an estimate of the plastic zone to estimate fracture toughness. The same procedure was then applied on nanosized bcc-Fe cantilever beams with an initial crack. The results were then compared to literature.
Jørn Skogsrud, Christian Thaulow
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Equivalent CTOD Concept for Correction of CTOD Toughness for Constraint Loss in Steel Weld Components

Materials Science Forum, 2012
This paper presents a new fracture assessment method, IST method developed as ISO 27306. The IST method implements an equivalent CTOD ratio, β, for the CTOD toughness correction for constraint loss in structural components. Using β, the standard fracture toughness specimen and structural components are linked at the same level of the Weibull stress ...
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Problems of Numerical CTOD Anlayses

1986
The 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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The Study of CTOD Test and Allowable Value

Advanced Materials Research, 2013
In order to determine the heavy plate structure have sufficient fracture toughness, based on BS7448 fracture toughness test experiment standard,the study of the typical bridge steel material were extended to CTOD( crack tip open displacement) fracture toughness test at 20 °C, The average CTOD value of base metal which was more than the allowable value ...
Qi Ming Yu, Hao Liang Sa
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An improvement of CTOD criterion for ductile fracture

Engineering Fracture Mechanics, 1992
Abstract In this paper a relationship between the critical crack tip opening displacement (CTOD) at crack initiation δ ti and the stress triaxiality σ m / \ gs is derived based on the damage mechanics criterion for ductile fracture, and a modified crack tip parameter δ ti ∗ and a modified CTOD criterion are ...
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Modifications To The CTOD Design Curve Approach

Offshore Technology Conference, 1986
ABSTRACT The existing crack tip opening displacement (CTOD) design curve approach is summarised, and new proposals are described for the assessment of finite width plates, plain materials and welded joints that have been post-welded heat treated.
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