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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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Influence of the mesh size on plastic CTOD
2021The Crack Tip Opening Displacement (CTOD) is an elastic-plastic fracture mechanics parameter usually employed as a measurement of fracture toughness and to explain the fatigue crack growth. This parameter can be decomposed on two different components: the elastic and plastic one.
Sanchez-Mancera, J. +3 more
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The Study of CTOD Test and Allowable Value
Advanced Materials Research, 2013In 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, 1992Abstract 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, 1986ABSTRACT 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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Study of Methods for CTOD Testing of Weldments
1990Several precracking methods for crack-tip opening displacement (CTOD) testing of weldments were studied, including as local precompression, reverse bending, and high R-ratio fatigue. The precracking procedure could influence the validity of the precrack shape.
S Machida +3 more
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The relationship between ctod, J and microstructural inhomogeneity
Engineering Fracture Mechanics, 1994Abstract The fracture behaviour of two types of welds with microstructural inhomogeneity is discussed using the concept of the specific energy γ pk . The relationship between the macroscopic fracture parameters, e.g. CTOD and J -integral, and the microstructural inhomogeneity is obtained.
Qianchu Liu, Thomas Varga
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On the influence of wet underwater welding on CTOD-δ5
International Journal of Fracture, 1999The influence of wet underwater welding on the crack tip opening displacement CTOD-δ5 is investigated in this paper. The welding process is numerically simulated. The instationary temperature field and welding residual stresses are calculated using the finite element method (FEM).
L. Lindhorst, O. Mahrenholtz
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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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