Fatigue crack growth model incorporating surface waviness for Wire+Arc additively manufactured components Conference Paper; open access; Calibrating a ductile damage model for two pipeline steels method and challenges Robin ,behavior,finite element model,fretting fatigue,pipeline,finite element analysis ,model,design Some results are removed in response to a notice of local law requirement.For more information,please see here.Previous123456NextSensitivity Analysis of Fatigue Crack Growth Model for API A model to predict hydrogen-assisted (HA) fatigue crack growth (FCG) of API pipeline steels has been proposed.The detailed background of the model derivation and full calibration for API X100 steel can be found in [ 1 ],while successful partial calibration of the model for API X100 and X52 steels by use of a reduced number of upfront tests
With the increase of fatigue crack growth rate,the influence of seawater on corrosive fatigue decreases gradually.Thereafter,a finite element model for analyzing the stress intensity factor of fatigue crack in pipelines is built,and the corrosive fatigue life of a submarine pipeline isMicrostructure and Mechanical Properties of Two Apiproperties relationships for pipeline steels have been carried out since 1980s.However,little information is available on fracture toughness and fatigue,mainly on near-threshold fatigue crack growth behavior13,14.Therefore,the present study was undertaken to evaluate the behavior of two commercial microalloyed API pipeline steels manufacturedMechanisms of Fatigue Crack Initiation and GrowthJul 02,2014 Fatigue crack growth of two pipeline steels in a#0183;The fatigue crack growth rates for Al and Ti are much more rapid than steel for a given K.However,when normalized by Youngs Modulus all metals exhibit about the same behavior.Crack Growth Rates of Metals
Carbon Steels .frequency = 0.1 to 1 Hz load ratio = 0.1 to 0.15 Fatigue crack growth rates in H.2 .greater than growth rates in air or inert gas Fatigue crack growth rates in H.2 .vary by factor of 10 .What is acceptable fatigue crack growth rate?III.3 Hydrogen Embrittlement of Structural SteelsThe fatigue crack growth rate (da/dN) versus stress-intensity factor range (DK) relationship is a necessary input to structural integrity models applied to steel hydrogen pipelines.One such integrity assessment methodology for steel hydrogen pipelines was recently published in the ASME B31.12 code.The measurement of fatigue crack growthHydrogen Isotope Effect on the Fatigue Crack Growth Rate We report the measurement of the fatigue crack growth rate in a high strength pipeline steel in a gaseous deuterium (D2) environment,in an effort to determine the role of diffusion rate on FCGR,because D2 is chemically identical to H2,but with twice the mass.
Corrosion fatigue and fatigue crack growth in air tests were comparatively conducted on an X52 pipelines steel.Fatigue crack growth rates in air were lower than corrosion fatigue crack growth rates due to the absence of hydrogen and mechanical dormancy arisen from low temperature creep at low cyclic frequencies.Fracture Resistance and Fatigue Crack Growth of X80 May 21,2012 Fatigue crack growth of two pipeline steels in a#0183;The fracture resistance and fatigue crack growth rates of two microstructural variations of X80 pipeline steel were measured in gaseous hydrogen at pressure of 21 MPa.The performance of these steels was found to be similar to the performance of other ferritic steels that are currently used to distribute gaseous hydrogen.Fatigue-Crack-Growth Behavior of Two Pipeline Steels Abstract This paper focuses on studying the fatigue-crack-growth behavior of two types of pipeline steels,and investigating their microstructural differences,which could influence the fatigue behavior.For fatigue experiments,compact-tension (CT) specimens are employed.
This paper compares the fatigue performance results of sour fatigue crack growth rate tests on C-Mn pipeline steel with sour fatigue endurance data.The discussion focusses on an examination of whether crack growth data might provide an alternative means of predicting knock-down factors (i.e.fatigueFatigue crack growth rates of API X70 pipeline steel in a It has been shown repeatedly that the strength of steels is inversely related to the ductility of the material in hydrogen gas.However,the fatigue properties with respect to strength are not as well documented or understood.Here,we present the results of tests of the fatigue crack growth rate (FCGR) on API X70 from two sources.Fatigue crack growth rates in high pressure hydrogen gas DOE PAGES Journal Article Fatigue crack growth rates in high pressure hydrogen gas for multiple X100 pipeline welds accounting for crack location and residual stress.Fatigue crack growth rates in high pressure hydrogen gas for multiple X100 pipeline welds accounting for crack
Jan 01,2014 Fatigue crack growth of two pipeline steels in a#0183;Fatigue crack growth tests were conducted on two pipeline steel alloys,API 5L X52 and X100.Baseline tests were conducted in air,and those results were compared with tests conducted in pressurized hydrogen gas.All tests were run at (load ratio) R = 0.5 and a frequency of 1 Hz,except for one test on X100,run at 0.1 Hz.Fatigue Testing of Pipeline Welds and Heat-Affectedwhich can provide the driving force needed for fatigue crack growth (FCG).A comprehensive testing program was conducted at the National Institute of Standards and Technology (NIST) over the course of three years on the base metal from four pipelines [8,9].Two API-5L X52 steels and two API-5LFatigue Study of Pipeline Steels by Bilin ChenTwo types of pipeline steels,Alloy B [Fe-0.05C-1.52Mn-0.12Si-0.092Nb,weight percent (wt.%)] and Alloy C [Fe-0.04C-1.61Mn-0.14Si-0.096Nb,wt.%)],were tested.Vickers hardness and nanoindentation tests were used to obtain the hardness and elastic modulus.Compact-tension (CT) specimens were employed for fatigue experiments.Different frequencies (10 Hz,1 Hz,and 0.1 Hz) and different stress
Oct 01,2015 Fatigue crack growth of two pipeline steels in a#0183;steel pipe exhibit fatigue performance similar to lower -strength steels in high-pressure hydrogen gas. Identify pathways for developing high-strength pipeline steels by establishing the relationship between microstructure constituents and hydrogen-accelerated fatigue crack growth (HA-FCG).Fiscal Year (FY) 2018 ObjectivesFatigue Growth Rates IPC2006-10320 Sohel Rana -Fatigue crack growth of two pipeline steels in a pressurized hydrogen environment.By J.McColskey and April Stevenson.Modeling the fatigue crack growth of X100 pipeline steel in gaseous hydrogen.By Kip Findley.Fatigue crack growth modeling of pipeline steels in high pressure gaseous hydrogen.Fatigue Growth Rates IPC2006-10320 Sohel Rana -Fatigue crack growth of two pipeline steels in a pressurized hydrogen environment.By J.McColskey and April Stevenson.Modeling the fatigue crack growth of X100 pipeline steel in gaseous hydrogen.By Kip Findley.Fatigue crack growth modeling of pipeline steels in high pressure gaseous hydrogen.
Fatigue Crack Growth on Double Butt Weld with Toe Crack of Pipelines Steel 597 ness on both the fatigue crack propagation rate (FCPR) and the constant amplitude low cycle fatigue for low carbon micro-alloyed pipeline steels (X60,X70,etc.) with various microstructures and toughness are studied by Zhong et al..Fatigue Crack Growth on Double Butt Weld with Toe CrackThe welded structures have a broad applicability (car industry,aeronautical,marine,pipelines,etc.).The welding being an assembled process,presents both advantages and disadvantages.A simple existing defect after welding can generate a catastrophic fracture.This work studies the fatigue crack growth of double butt weld with toe crack.Fatigue Crack Growth of Two X52 Pipeline Steels in a Fatigue crack growth tests were conducted on two API 5L X52 pipeline steel alloys.One alloy was from a new pipe that was installed for hydrogen service in 2011.The other alloy was from a vintage pipe that first saw natural gas service in 1964.
A phenomenological fatigue crack growth (FCG) model was previously proposed to predict the FCG of API-5L X100 steel in high-pressure gaseous hydrogen .The model presumes that total FCG is a summation of a pure fatigue component and a hydrogen-assisted (HA) component.Fatigue Crack Growth Rates in Six Pipeline Steels A fatigue crack growth test for full thickness pipeline samples was developed using a Middle Tension (MT) type specimen.The six steels showed similar fatigue crack growth rate (da/dN) behavior.There were only minor differences among the steels for the threshold values and most of the stable crack growthFATIGUE CRACK GROWTH RATES OF API X70 PIPELINESep 01,2017 Fatigue crack growth of two pipeline steels in a#0183;Fatigue crack growth (FCG) tests were conducted at NIST (Boulder) on an X52 pipeline steel that is currently in service transporting hydrogen gas,as well as two X70 pipeline steels.The compact tension specimens were tested in hydrogen gas pressurized to 5.5 MPa or 34 MPa.
A fatigue crack growth test for full thickness pipeline samples was developed using a Middle Tension (MT) type specimen.The six steels showed similar fatigue crack growth rate (da/dN) behavior.There were only minor differences among the steels for the threshold values and most of the stable crack growthFATIGUE CRACK GROWTH IN HYDROGEN PIPELINESchematic of fatigue crack growth rate vs.stress intensity factor range 'K .2.2.1 Variables affecting fatigue crack growth rate Suresh and Ritchie  studied several low strength pressure vessels and pipeline steels in dehumidified gaseous hydrogen and moist air.Discerning the Fatigue Crack Growth Behavior of API X65 The fatigue crack growth rates (FCGR),was widely accepted to ascertain the progression of fatigue cracking by adopting the maximum stress intensity factor (SIF),K max and the range of SIF,(K determined by (K = K max - K min with K min being the minimum stress intensity factor as a mechanical driving forces for growth of cracks.This
ASME SA-105 Grade II steel,which is used in high-pressure hydrogen compressor systems,is similar to steels used or considered for use in high-pressure hydrogen storage vessels and pipelines.This paper summarizes the results of a program conducted to provide cyclic-load crack growth rate (da/dN) data for a fracture mechanics analysis of a 15,000 psi hydrogen compressor facility which Crack Growth Modeling and Life Prediction of Pipeline Crack Growth Rate Fatigue Crack Growth Stress Corrosion Crack Pressure Fluctuation Pipeline Steel These keywords were added by machine and not by the authors.This process is experimental and the keywords may be updated as the learning algorithm improves.Cited by 7Publish Year 2014Author Robert L.Amaro,Elizabeth S.Drexler,Neha Rustagi,Nicholas E.Nanninga,Yaakov S.Levy,Andrew J.The Effect of Hydrogen Gas on Fatigue Performance of SteelsThe higher fatigue crack growth rate in the lower strength HY80 steel might be in fact attributed to other factors related to microstructural difference between the two steels.More work is required to investigate the effect of material strength on fatigue crack growth behaviour in hydrogen environment.
Fatigue crack growth tests were conducted on two pipeline steel alloys,API 5L X52 and X100.Baseline tests were conducted in air,and those results were compared with tests conducted in pressurized hydrogen gas.All tests were run at (load ratio) R = 0.5 and a frequency of 1 Hz,except for one test on X100,run at 0.1 Hz.Cited by 71Publish Year 2014Author A.J.Slifka,E.S.Drexler,N.Rustagi,D.S.Lauria,J.D.MccColskey,R.L.Amaro,A.E.StevensoFatigue crack growth of two pipeline steels in a Fatigue crack growth tests were conducted on two pipeline steel alloys,API 5L X52 and X100.Baseline tests were conducted in air,and those results were compared with tests conducted inCited by 71Publish Year 2014Author A.J.Slifka,E.S.Drexler,N.Rustagi,D.S.Lauria,J.D.MccColskey,R.L.Amaro,A.E.StevensoFatigue Crack Growth in Two Pipeline Steels - Advanced Dec 06,2016 Fatigue crack growth of two pipeline steels in a#0183;Researchers focus on studying the fatigue-crack-growth behaviour of two types of pipeline steels for the transport of hydrogen or natural gases.With the globalization of modern society and the increase in population,there is an ever-increasing demand for energy.
Fatigue crack growth tests were conducted on two API 5L X52 pipeline steel alloys.One alloy was from a new pipe that was installed for hydrogen service in 2011.The other alloy was from a vintage pipe that first saw natural gas service in 1964.Baseline tests were conducted in air,and those results wereCited by 1Publish Year 2017Author Elizabeth S.Drexler,Andrew J.Slifka,Robert L.Amaro,Damian S.Lauria,Jeffrey W.Sowards12345NextFatigue Crack Growth Rates in Pipeline Steels Using Curved A fatigue crack growth test for full-thickness curved pipeline samples was developed using a middle tension (M(T)) specimen.Also,finite element analyses (FEAs) were carried out to show the M(T) curvature effects on the fatigue crack growth results.The two steels showed similar fatigue crack growth rate (da/dN) behavior.However,the ferrite Cited by 16Publish Year 2014Author Elizabeth S.Drexler,Andrew J.Slifka,Robert L.Amaro,Nicholas Barbosa,Damian S.Lauria,Louis EFatigue crack growth law of API X80 pipeline steel under Loadcontrolled threepoint bending fatigue tests were conducted on API X80 pipeline steel to investigate the effects of stress ratio and specimen orientation on the fatigue crack growth behaviour.Because of the high strength and toughness of X80 steel,crack growth rate was measured and plotted versus J with stress ratio.The fatigue
fatigue crack growth modelling of pipeline carbon steels under gaseous hydrogen conditions.The model is developed primarily based on the correlation of environment-affected zone (EAZ) and plastic zone.In the model,fatigue crack growth rate is predicted by Forman equation to take into account the influence from fracture toughness.Author Arry Bussiba,Philippe P.Darcis,J D.McCloskey,Christopher N.McCowan,Thomas A.Siewert,GabrielPublish Year 2006Fatigue Crack Growth in C-Mn Pipe Steel in Sour An investigation of fatigue crack growth performance of a C-Mn pipeline steel in a sour environment in reported.The influence of variables (e.g.loading conditions,crack depth,specimen geometry,pre-soak and coating configuration) was investigated to provide guidance on assessing shallow,crack-like flaws.Member Report 930/2009Assessing Steel Pipeline and Weld Susceptibility to fatigue crack growth in steels in high-pressure H.2.gas Industrially relevant pipeline grades Representative service environment Fatigue crack growth data will be the basis for requirements of the ASME B31.12 code Assess variables that influence hydrogen embrittlement in pipeline steels Welds Microstructural banding
Nov 01,2010 Fatigue crack growth of two pipeline steels in a#0183;Further fatigue crack growth studies on pipeline steels at different pressures and frequencies should better elucidate the interplay between these two important variables and their role on crack tip hydrogen concentrations.3.4 Effect of Frequency on FCG BehaviorA Review of Fatigue Crack Growth for Pipeline Steels Nov 01,2010 Fatigue crack growth of two pipeline steels in a#0183;Since hydrogen pipeline use is expected to grow,the mechanical integrity of these pipelines will need to be validated under the presence of pressurized hydrogen.This paper focuses on a review of the fatigue crack growth response of pipeline steels when exposed to115 A Review of Fatigue Crack Growth for Pipeline Steels A Review of Fatigue Crack Growth for Pipeline Steels Exposed to Hydrogen Volume 115 Number 6 November-December 2010 N.Nanninga,A.Slifka,Y.Levy Materials Reliability Division,National Institute of Standards and Technology,Boulder,CO 80305 and C.White Materials Science and
These two alloys show no such correlation between yield strength and fatigue crack growth rate.This is significant,because if fatigue-based design is used,both stronger and thinner steel can be employed,resulting in reduced costs for transportation of hydrogen gas via pipeline.(PDF) Fatigue crack growth of two X52 pipeline steels in a Tests on the fatigue crack growth rate were conducted on four pipeline steels,two of grade API 5L-X52 and two API 5L-X70.One X52 material was manufactured in the mid-1960s and the other was Sensitivity Analysis of Fatigue Crack Growth Model A model to predict fatigue crack growth of API pipeline steels in high pressure gaseous hydrogen has been developed and is presented elsewhere.The model currently has several parameters that must be calibrated for each pipeline steel of interest.This work provides a sensitivity analysis of the model parameters in order to provide (a) insight to the underlying mathematical and mechanistic