Results 171 to 180 of about 1,592 (205)

The relationship between ctod, J and microstructural inhomogeneity

Engineering Fracture Mechanics, 1994
Abstract 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, 1999
The 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
openaire   +1 more source

Numerical determination of plastic CTOD

Fatigue & Fracture of Engineering Materials & Structures, 2018
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, F.A. Díaz, J.M. Vasco‐Olmo, P. Prates   +3 more
openaire   +1 more source

Study of Methods for CTOD Testing of Weldments

1990
Several 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, T Miyata, M Toyosada, Y Hagiwara   +3 more
openaire   +1 more source

CTOD Testing of HAZ and Analysis of Pop-In Behavior

Journal of Offshore Mechanics and Arctic Engineering, 1990
Abstract HAZ CTOD tests were carried out on nonmatching bead on plate SAW weldments at room temperature. The effects of the notch position and weld metal matching on the HAZ toughness were studied by taking weld metals with three strength levels (austenitic, ferritic and martensitic weld metals). The notches were located parallel (L-type)
M. Koc¸ak, L. Chen, G. Terlinde, G. Gnirss, K.-H. Schwalbe   +4 more
openaire   +1 more source

Numerical Determination of Fatigue Threshold from CTOD

Solid State Phenomena, 2016
The experimental procedure to obtain valid and comparable values of ΔKth is laborious and time consuming. The objective of this work is to determine ΔKth using a numerical approach. The CTOD is plotted versus load, and the fatigue threshold corresponds to the onset of plastic deformation.
Daniel Camas, Pedro Loureiro, Pedro Prates, Fernando Antunes   +3 more
openaire   +1 more source

Measurements of CTOD and CTOA Around Surface-Crack Perimeters and Relationships Between Elastic and Elastic-Plastic CTOD Values

1990
A difficulty associated with predicting structural integrity is that the surface cracks found in structural components are three-dimensional whereas the crack-tip opening displacement (CTOD) and J-integral analytical techniques were derived from two-dimensional theory.
WG Reuter, WR Lloyd
openaire   +1 more source

Effect of physical crack growth on CTOD measurement

International Journal of Fracture, 1987
In high toughness ductile materials crack initiation is generally followed by a region of stable cracking. Such regions have been conveniently characterized in terms of crack growth resistance curves. Both J-integral and crack tip opening displacement (CTOD) concepts are successfully used to describe ductile crack growth using J-Aa and CTOD-Aa R-curves,
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CTOD and J Relationships for a Growing Crack

1986
Tests were performed on three steels, A533-B, A508 Class 2, and ASTM A240 Thype 304 stainless. These materials exhibit a wide range of properties; their strain-hardening exponents n are within the range of 8 to 12 while their flow stresses sigma-O are within the range of 45 to 90 ksi.
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On the Experimental Determination of CTOD Based R-Curves

1986
It is demonstrated that the British Standard BS 5762 for measuring the crack tip opening displacement (CTOD) can be modified such that the resulting CTOD is equal to the CTOD measured at the fatigue crack tip. The modifications consist of accounting for crack growth and adjustment of the rotation factor to the material under consideration.
D. Hellmann, K.-H. Schwalbe
openaire   +1 more source