Effect of single overload on fatigue crack growth in


The effects of overloads in fatigue crack growth

The effects of overloads in fatigue crack growth .R.L.Carlson,G.A.Kardomateas and P.R.Bates .Several theories have been proposed to explain the transient fatigue crack growth decelerations and accelerations which follow overloads.The mechanisms that have been proposed to explain retardation after a tensile overload,for example,The effect of overload on the fatigue crack growth The main causes for retardation were found as crack blunting and a long reinitiation period for the fatigue crack.Regarding the environmental effect,the overload retardation was lowest in a hydrogen atmosphere.This low degree of retardation was explained by a hydrogen embrittlement mechanism.In a general sense,hydrogen may cause a different crack closure mechanism and hydrogen inducedThe Effects of Overload on the Fatigue LifeSingle or multiple overloads applied on specimens affect the fatigue life of those specimens.Tensile overload on a notched specimen decreases the crack growth rate due to the compressive residual stress at notch tip generated by the overload.

The Effects of Overload on the Fatigue Life

Single or multiple overloads applied on specimens affect the fatigue life of those specimens.Tensile overload on a notched specimen decreases the crack growth rate due to the compressive residual stress at notch tip generated by the overload.Some results are removed in response to a notice of local law requirement.For more information,please see here.Previous123456NextEffects of a single tensile overload on fatigue crack During single overload,the fatigue crack growth rate shows a short period of acceleration followed by a significant decrease,leading to subsequent crack growth retardation.Previous123456Next

Predicting the Effects of Overloads on Fatigue Crack

Mar 18,2004 Effect of single overload on fatigue crack growth in#0183;Predicting the Effects of Overloads on Fatigue Crack Growth in an Al-SiC MMC Using a Computational Model The Effect of Single Overloads on Fatigue Crack Propagation in Steels, Met.Sci.,Aug./Sept.,pp.390398.5.Robin,C.,Louah,M.,and .Pluvinage,G.,1983, Influence of an Overload on the Fatigue Crack Growth in Steels Overload and Underload Effects on the Fatigue Crackequalto Sul]Smax = 0.02,the fatigue crack growth life increased for overloads in the range of 1.0 Effect of single overload on fatigue crack growth inlt; Sol/Smax Effect of single overload on fatigue crack growth inlt;---2.0.At an overload of Sol/Smax = 2.0,the fatigue life was more than 60 times greater than the constant amplitude fatigue life.For overloads greater than Sol/Sma x = 2.0,the fatigue crack growth life decreased with increasing overload stress.Influence of single tensile overload on fatigue crack Nov 01,2020 Effect of single overload on fatigue crack growth in#0183;The FCGR is affected by the plastic deformation around the crack tip under the action of load.In order to explain the effect of external load changes on crack growth,a single overload has been generally applied on the specimens.Overload can strongly affect the process of fatigue crack growth (FCG) ,,,.After applying the overload,FCGR increases instantaneously.

INFLUENCE OF AN OVERLOAD ON THE FATIGUE CRACK GROWTH

Abstract This study is concerned with the influence of a singlepeak overload and the overload ratio on the subsequent rate of growth of a fatigue crack in steels.Retardation increases withGenerally,the crack closure is reduced rapidly due to crack tip blunting after a single overload,so the fatigue crack is temporarily free from crack closure,as a result,a transient initial acceleration of crack growth rateoccurs immediately after the overloads.Author:Shengci Li,Yinghui Zhang,Liang Qi,Yonglin KangCited by:16Publish Year:2018Effect of single tensile overload on fatigue crack growth Was this helpful?Effect of single overload on fatigue crack growth in May 01,2019 Effect of single overload on fatigue crack growth in#0183;To analyze the effect of single tensile overload on fatigue crack growth behavior,a series of experiments have been conducted under different load ratios and overload ratios on QSTE340TM automobile steel.The results showed that the application of overload extended the fatigue life of the specimens in all cases.Fractographic analysis of the overload effect on fatigue The effect of single overload on the fatigue crack growth in 2024-T3 and 7075-T6 Al alloys was analyzed.Fatigue tests under constant-amplitude loading with overload peak were carried out on

Fatigue crack growth overload effect mechanistic

Synchrotron-based,high-energy X-ray diffraction measurements are used to study the local strain fields underlying the transient fatigue crack growth rate retardation produced by a single overload cycle known as the overload effect.Specifically,4140 steel compact tension specimens fatigued for varying levels of crack growth after an overload cycle have been studied with in-situ diffraction under varying externalFATIGUE CRACK GROWTH RATE MEASURE- MENT OFfatigue crack growth rate is retarded after overloading and then gradually recovers to the normal.It is also observed that the retardation effect is intensified when the overload ratio and the stress range between overload stress and the followingExperimental Study on the Fatigue Crack Growth and In metals,the retardation in fatigue crack propagation caused by single or multiple overloads has been concerned for a long time (Ref 12,13).Some scholars believe that the residual stress in the larger plastic zone introduced by overload at the crack tip decreases the fatigue crack growth rate (Ref 14).

Evaluation of overload effects on fatigue crack growth and

A series of fatigue crack growth experiments on Q345R steel are conducted by a constant amplitude load with a single overload/underload.The fatigue crack growth behavior of Q345R steel with Elastic plastic fracture behavior and effect of band Single overload and band overloads were applied under mode-I condition,during constant amplitude (tension- tension) fatigue crack growth test.It is observed that overload and band-overload applications resulted retardation on the fatigue crack growth rate in most of the cases.Effects of a single tensile overload on fatigue crack Effects of a tensile overload,e.g.initial acceleration and subsequent retardation of fatigue crack growth,were explained and quantified by FESEM and compliance measurements.The FESEM observations suggest that the initial crack growth acceleration stems from void and quasi-cleavage fracture within the fatigue damage zone in the vicinity of the crack tip.

Effects of a single tensile overload on fatigue crack

During single overload,the fatigue crack growth rate shows a short period of acceleration followed by a significant decrease,leading to subsequent crack growth retardation.Effects of a Single Overload Event on the Fatigue Crack Different loading conditions,as for the experimental tests,are used in order to study numerically the effects of these parameters on the retardation of the fatigue crack due to the overload.The experimental and numerical results show the decrease of the crack growth rate due to the overload.Effect of Single Overload/Underload Cycles on Fatigue Abstract.Tests,represented in a three-dimensional matrix,were performed to investigate the effects of a single overload/underload sequence on the fatigue crack-growth rate in 2024-T3 aluminum alloy.Three different stress intensity ratios were studied to investigate the delay phenomenon (1) overload level to maximum cyclic level,Kol / Kmax; (2) underload level to overload level,Kul / Kol; and (3) minimum

Effect of Single Overload Ratio and Stress Ratio on

Fatigue life and fatigue crack growth rate were affected by this factor.Results showed an increasing in fatigue crack growth rates (FCGRs) with increasing stress ratio.Variable amplitude loading (VAL) can take many forms i.e with a single overload,overload band etc.The shape of these loads affects strongly the fracture life and FCGRs.Effect of Single Overload Ratio and Stress Ratio on Fatigue life and fatigue crack growth rate were affected by this factor.Results showed an increasing in fatigue crack growth rates (FCGRs) with increasing stress ratio.Variable amplitude loading (VAL) can take many forms i.e with a single overload,overload band etc.The shape of these loads affects strongly the fracture life and FCGRs.Effect of Interrupted Ageing and Retrogression-Reageing Thus,there are two important aspects of the single applied overload first,that the superposition of single tensile overload on the base loading results in crack growth retardation or a full crack arrest,22 which leads to an increase in service life; and second,the study of the single overload effect on the crack propagation rate of subsequent cycles forms a basis for the study of variable amplitude loading 4.

EFFECT OF SPECIMEN GEOMETRY ON FATIGUE CRACK GROWTH

Mark Croft,Najeh Jisrawi,Alexander Ignatov,Ronald L Holtz,Zhong Zhong,Fatigue crack growth overload effect mechanistic insights from in-situ synchrotron measurements,The Journal of Strain Analysis for Engineering Design,10.1177/0309324711435197,47,2,(83-94),(2012).Cited by 8Publish Year 2019Author Yun-chao Lu,Feng-peng Yang,Te ChenEffect of single tensile overload on fatigue crack growth Jan 01,2018 Effect of single overload on fatigue crack growth in#0183;Several mechanisms have been proposed to explain crack growth delay following a single peak overload,including residual compressive stresses ,plasticity-induced crack closure ,crack tip blunting ,strain hardening and crack branching .Study on fatigue crack propagation behavior under a single tensile overload is helpful to predict the fatigue life under variableCited by 56Publish Year 1999Author G.Wheatley,Xiao Hu,Y.EstrinSome results are removed in response to a notice of local law requirement.For more information,please see here.12345NextEffects of a single tensile overload on fatigue crack Dec 24,2001 Effect of single overload on fatigue crack growth in#0183;Effects of a tensile overload,e.g.initial acceleration and subsequent retardation of fatigue crack growth,were explained and quantified by FESEM and compliance measurements.The FESEM observations suggest that the initial crack growth acceleration stems from void and quasicleavage fracture within the fatigue damage zone in the vicinity of the crack tip.

Cited by 3Publish Year 2020Author Wentao He,Changzi Wang,Junlin Deng,De Xie,Zhengyi ZhangEffects of a single tensile overload on fatigue crack

Dec 24,2001 Effect of single overload on fatigue crack growth in#0183;Effects of a tensile overload,e.g.initial acceleration and subsequent retardation of fatigue crack growth,were explained and quantified by FESEM and compliance measurements.The FESEM observations suggest that the initial crack growth acceleration stems from void and quasicleavage fracture within the fatigue damage zone in the vicinity of the crack tip.Cited by 16Publish Year 2018Author Shengci Li,Yinghui Zhang,Liang Qi,Yonglin KangEffect of single tensile overload on fatigue crack growth Jan 01,2020 Effect of single overload on fatigue crack growth in#0183;The changes of FCG rate induced by overload reflect the intrinsic mechanism of fatigue damage the FCG rate accelerates instantaneously right after the application of overload,which is due to the fact that the tensile overload results in crack tip blunting and further makes crack closure effect decreasing sharply; subsequently,the residual compressive stress induced by overload would makeAn Analytical Model for Fatigue Crack Propagation Right after the single overload,the fatigue crack growth rate increases in a short time and then decreases sharply.After a certain crack length,the retardation phenomenon vanishes and the crack growth rate turns back to the original trend.Note that very good agreement is observed between the model prediction and experimental data.Figure 8

An Analytical Model for Fatigue Crack Propagation

Right after the single overload,the fatigue crack growth rate increases in a short time and then decreases sharply.After a certain crack length,the retardation phenomenon vanishes and the crack growth rate turns back to the original trend.Note that very good agreement is observed between the model prediction and experimental data.(PDF) Effect of band-overload on fatigue crack growth rate The effect of single-cycle overloads on the subsequent fatigue crack growth behavior of Inconel 600 is studied.Overloads ranging from 10 to 50% are applied to a sample undergoing baseline fatigue(PDF) Effect of band-overload on fatigue crack growth rate The effect of single-cycle overloads on the subsequent fatigue crack growth behavior of Inconel 600 is studied.Overloads ranging from 10 to 50% are applied to a sample undergoing baseline fatigue


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