... specimen brittle fracture accuracy four-point shear test asia government crack tip fracture prediction hydraulic fracturing prediction accuracy fracture principal stress japan government weibull stress prediction crack tip radius analytical result mode ii displacement beam...

... ABSTRACT In this paper, a method for estimating the crack-tip opening displacement (CTOD) is proposed, which based on the maximum crack opening displacement (MCOD) and the nodal displacement of the crack surfaces at crack front. The critical CTOD and corresponding MCOD values of cryogenic high...

... different loading path fatigue crack growth phase difference simulation metals & mining loading path hydraulic fracturing crack tip crack growth specimen growth behavior numerical simulation plastic strain non-proportional loading path propagation hysteresis curve y-axis...

...Proceedings of the Thirty-second (2022) International Ocean and Polar Engineering Conference Shanghai, China, June 5 10, 2022 Copyright © 2022 by the International Society of Offshore and Polar Engineers (ISOPE) ISBN 978-1-880653-81-4; ISSN 1098-6189 www.isope.org Stress-strain field at crack tip...

...-dimensional surface cracked slabs in Marine structures, based on the theory of elastic-plastic fracture mechanics and crack closure theory, the finite element numerical simulation of ABAQUS was used to obtain the stress-strain field at the crack tip of 3d surface cracked plates made of Q345 steel...

... crack tip cyclic loading stress ratio stress-strain field crack growth rate hull plate theoretical model deformation ctod specimen amplitude accumulative plastic failure hydraulic fracturing plastic zone ct specimen formula monotonic plastic zone maximum load crack length...

... is one of the factors of difficulty. The Weibull stress based on the local approach proposed by Beremin (1983) is a new parameter for predicting the initiation of brittle fracture near crack tips. upstream oil & gas prediction specimen prediction accuracy defect weibull stress approach...

... undermatch weld corrosion management polar engineering conference fracture toughness fracture toughness testing tkaczyk flaw procedure pépin midstream oil & gas overmatch weld assessment proceedings nikbin offshore pipeline h2s management weld pipeline girth weld specimen crack tip...

... copes. The applicability of Weibull stress approach and Toughness Scaling Model approach in predicting brittle fracture from crack tips was verified. Furthermore, the effect that the shape of weld access hole gives to ultimate strength of specimens was examined. Consequently, it was shown...

... with the voids due to the fracture of β phase ahead of the crack tip at low applied strain levels. In addition, hydrogen concentration in the ligament between the SCC-induced crack tip and voids accelerates the propagation of the crack, indicating that hydrogen concentration and partitioning among various trap...

...-called delayed hydride cracking (DHC), for which crack propagation is delayed and occurs stepwisely as brittle hydride phases form in the crack-tip vicinity (Puls, 2012). In fact, the stress is known to be a vector for hydrogen diffusion in metallic materials. Hydrogen migrates towards high hydrostatic...

... access hole brittle fracture test result crack tip specimen skeleton curve ductile crack beam cope Prediction of brittle fracture at the Toes of Weld Access Hole of the welded I-section Beam End Junwei Wang, Koji Azuma Department of Architecture, Sojo University Kumamoto, Japan Tsutomu...

... a single OL in CA loading, see Fig. 2. The first concept is based on the existence of residual stresses present in the plastic zone in front of the crack tip. This plastic zone is created by the OL and reduces the effective stress of subsequent cycles with smaller amplitude. This effect is present...

... stress crack growth simulation crack tip Fatigue Crack Growth Simulation Using Characteristic Tensor Hidekazu Murakawa Joining and Welding Research Institute, Osaka University Ibaraki, Osaka, Japan ABSTRACT It is known that fatigue life of welded structures, such as ships and bridges, is greatly...

... propagation. A concept of local critical stress was employed for determining brittle crack propagation. The local critical stresses of the materials were determined from the local critical stresses at the crack tip in static crack tip opening displacement (CTOD) tests estimated by finite element analysis...

... marchi gas environment corrosion management h2s management fracture surface transaction hydrogen embrittlement production chemistry oilfield chemistry fe surface sofronis material strength somerday gas pressure impurity toughness test crack tip Inhibition of Hydrogen Embrittlement...

... ABSTRACT Since offshore structures are operating in a hostile environment, the in-situ reparation of cracked structural parts is always difficult. An easy technique to arrest or retard the growth of fatigue cracks is the drilling of stop holes. The holes on the crack tip transform the stress...

... in FCGR. However, in some tests there was no obvious plateau suggesting that static crack growth may have been observed at the end of the FCGR test. The possible role of crack tip strain rate on the observed crack growth behavior is explored. KEY WORDS: Sour Acidizing Environments, Hydrogen Embrittlement...

... that retained austenite also contributes to brittle crack propagation. fracture surface ni steel x-ray diffraction liquified natural gas crack propagation static tensile test tensile test microstructure lng mechanism gas monetization steel decrease amount transformation crack tip...

... Abstract In this paper, the crack stress intensity factor in weld toe of T- joint under uniaxial and biaxial load is studied. A series of geometries of semi-elliptical surface cracks were selected as elementary crack geometries, the appropriate element size of crack tips are selected according...