A Theory of Critical Distances based methodology for the analysis of environmentally assisted cracking in steels

González, Paula; Cicero, Sergio; Arroyo, Borja; Álvarez, J.A.

doi:10.1016/j.engfracmech.2019.04.004

Cited by 20 publications

(11 citation statements)

References 45 publications

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“…Standard geometry [33] was used for pre-cracked specimens, slightly modified for notched ones, as shown in Figure 5. As mentioned above, the use of the TCD in EAC analyses has been previously presented in [20]. The resulting methodology was validated in steels S420 and X80 subjected to cathodic polarization at 5 mA/cm 2 , obtaining satisfactory results.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…In this study, two levels of current intensity (5 mA/cm 2 and 1 mA/cm 2 ) have been considered. The former was previously applied in [20], whereas the latter has been specifically applied for this study. Cathodic polarization at these levels is used to cause two levels of hydrogen embrittlement on the steels.…”

Section: Simulation Of Hydrogen Embrittlementmentioning

confidence: 99%

“…Recently, the authors have proposed the use of the TCD to analyze EAC processes, providing accurate results [20] in one specific aggressive environment. The aim of this paper is to extend the validation of the use of the TCD in EAC assessments, analyzing the effect of two cathodic current densities on two different steels (S420 and X80) that are commonly used in offshore components, power plants and pipes.…”

Section: Introductionmentioning

confidence: 99%

“…The experimental program is composed of 40 C(T) specimens (20 of which are presented for the first time in this paper), with notch radii varying from 0 mm (crack-like defects) up to 2 mm. The aggressive environments have been generated through cathodic charges (or cathodic polarization) at 1 mA/cm 2 (new tests) and 5 mA/cm 2 (tests previously presented in [20]), which are used to cause HE on the steels. The study has been completed with finite element simulations.…”

Section: Introductionmentioning

confidence: 99%

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Environmentally Assisted Cracking Behavior of S420 and X80 Steels Containing U-notches at Two Different Cathodic Polarization Levels: An Approach from the Theory of Critical Distances

González

Cicero

Arroyo

et al. 2019

Metals

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This paper analyzes, using the theory of critical distances, the environmentally assisted cracking behavior of two steels (S420 and API X80) subjected to two different aggressive environments. The propagation threshold for environmentally assisted cracking (i.e., the stress intensity factor above which crack propagation initiates) in cracked and notched specimens (KIEAC and KNIEAC) has been experimentally obtained under different environmental conditions. Cathodic polarization has been employed to generate the aggressive environments, at 1 and 5 mA/cm2, causing hydrogen embrittlement on the steels. The point method and the line method, both belonging to the theory of critical distances, have been applied to verify their capacity to predict the initiation of crack propagation. The results demonstrate the capacity of the theory of critical distances to predict the crack propagation onset under the different combinations of material and aggressive environments.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Simulation Of Hydrogen Embrittlementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Environmentally Assisted Cracking Behavior of S420 and X80 Steels Containing U-notches at Two Different Cathodic Polarization Levels: An Approach from the Theory of Critical Distances

González

Cicero

Arroyo

et al. 2019

Metals

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“…General models attempt to explain the crack propagation modes on HIC conditions of high strength low allow steels (HSLA), mostly intergranular (IG) or transgranular (TG), and the parameters that control them, considering that the presence of hydrogen at the crack tip plays a fundamental role [4,5,[16][17][18][19]. In [4,18], it is established that the crack propagation in HIC takes place as a series of local isolated fractures, nucleated and developed at the plastic zone ahead of the crack tip.…”

Section: Crack Propagaion Model In Hicmentioning

confidence: 99%

A Proposal for the Application of Failure Assessment Diagrams to Subcritical Hydrogen Induced Cracking Propagation Processes

Arroyo

Laso

Gutiérrez‐Solana

et al. 2019

Metals

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In this work, an optimization proposal for a model based on the definition of regions for crack propagation by means of the micromechanical comparison by SEM images and its application to failure assessment diagrams (FADs) is presented. It consists in three approaches. (1) The definition of the crack propagation initiation in the elastic-plastic range. (2) A slight modification of the zones in which the FAD is divided for hydrogen induced cracking (HIC) conditions. (3) The introduction of a simple correction for the definition of the Kr coordinate of the FAD to take into account the fracture toughness reduction caused by an aggressive environment, instead of using a fracture parameter obtained from a test in air. For the experimental work, four medium and high strength steels exposed to a cathodic charge and cathodic protection environments were employed, studying two different loading rates in each case, and testing C(T) samples under slow rates in the environment. The study was completed with a subsequent fractographic analysis by SEM. A good degree of fulfilment was appreciated in both materials and environmental conditions, showing the validity of the predictions supplied by the FAD optimization model proposal, which constitutes an advance in the accuracy of the FAD predictive model.

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Analysis and Experimental Investigation on Fatigue Performance of Tensile-Plate Anchorage Based on the Theory of Critical Distances

Wang,

Zhou,

Zhang

et al. 2023

Int J Steel Struct

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A Theory of Critical Distances based methodology for the analysis of environmentally assisted cracking in steels

Cited by 20 publications

References 45 publications

Environmentally Assisted Cracking Behavior of S420 and X80 Steels Containing U-notches at Two Different Cathodic Polarization Levels: An Approach from the Theory of Critical Distances

Environmentally Assisted Cracking Behavior of S420 and X80 Steels Containing U-notches at Two Different Cathodic Polarization Levels: An Approach from the Theory of Critical Distances

A Proposal for the Application of Failure Assessment Diagrams to Subcritical Hydrogen Induced Cracking Propagation Processes

Analysis and Experimental Investigation on Fatigue Performance of Tensile-Plate Anchorage Based on the Theory of Critical Distances

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