The effect of loading rate and temperature on fracture initiation in 1020 hot-rolled steel

Wilson, Maywood L.; Hawley, R. H.; Duffy, J.

doi:10.1016/0013-7944(80)90066-1

Cited by 53 publications

(12 citation statements)

References 11 publications

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“…The most obvious temperature dependent parameter is the yield strength, which for most steels increase with decreasing temperature [2][3][4][5][6][7][8][9][10][11][12][13][14]. Another temperature dependent property is the ductile-to-brittle transition (DBT) in steels.…”

Section: Introductionmentioning

confidence: 99%

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Effect of low temperature tensile properties on crack driving force for Arctic applications

Dahl

Ren

Akselsen

et al. 2018

Theoretical and Applied Fracture Mechanics

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Many petroleum companies expand their activities further north towards the Arctic region, resulting in design temperatures down to −60• C, which is much lower than what is usual for most current petroleum installations. As properties of steels are temperature dependent, it is of great interest to evaluate the effects of low temperature on the crack driving force in steels. The present work investigates these effects numerically using finite element (FE) models of single-edge-notchedtension (SENT) specimens with crack depths 0.1 ≤ a/W ≤ 0.5. The effects of Lüders strain, yield strength and crack depth on the crack tip opening displacement (CTOD) and the relation between CTOD and crack mouth opening displacement (CMOD) are studied, and it is shown that an increase in yield strength and Lüders strain, as a result of Arctic temperature, intensifies the crack driving force. It is also shown that the crack depth has very little influence on the effect of Lüders strain on the CTOD. An approximate model that can be used to estimate the CTOD based on yield strength, Lüders strain and loading is proposed for gross stress levels σ G /σ y ≤ 0.5 and a crack depth a/W = 0.5. It is finally shown that the tensile properties have a more significant effect on the CTOD-CMOD relation than the crack depth for a SENT specimen.Mange petroleumsselskaper utvider sine aktiviteter nordover mot arktiske områder. Dette fører til designtemperaturer ned til −60• C, noe som er mye lavere enn det som er vanlig for de fleste nåvaerende petroleumsinstallasjoner. Ettersom egenskapene til stål er temperaturavhengige, er det av stor interesseå evaluere effektene av lav temperatur på den drivende kraften for sprekkvekst i stål. Dette arbeidet undersøker disse effektene numerisk ved hjelp av elementmetoden med modeller av single-edge-notched-tension (SENT)-bruddprøver med sprekkdybder 0.1 ≤ a/W ≤ 0.5. Effektene av Lüders tøyning, flytespenning og sprekkdybde på sprekkspissutvidelsen (CTOD) og sammenhengen mellom CTOD og sprekkmunningsutvidelsen (CMOD) er studert, og det er påvist at økt flytespenning og Lüders tøyning, som et resultat av arktisk temperatur, fører til økt drivende kraft for sprekkvekst. Det er også vist at sprekkdybden har liten innflytelse på effekten av Lüders tøyning på CTOD. Det er foreslått en omtrentelig modell som kan bli brukt tilå estimere CTOD basert på flytespenning, Lüders tøyning og last for bruttospenningsnivåer σ G /σ y ≤ 0.5 og sprekkdybde a/W = 0.5. Det er til slutt påvist at materialets strekkegenskaper har en større virkning på CTOD-CMOD-forholdet enn sprekkdybden for en SENT-prøve.i ii PrefaceThe work presented here is a Master's thesis written at Department of Engineering Design and Materials at Norwegian University of Science and Technology (NTNU). The thesis work is carried out as a part of SMACC (Studies of materials behavior for future cold climate applications), which is a research project with several industry partners, and with SINTEF and NTNU as research partners.The author wishes to thank SINTEF fo...

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Section: Introductionmentioning

confidence: 99%

“…The fracture toughness of steels is usually reduced when decreasing the temperature [5,10,[12][13][14]22].…”

Section: Introductionmentioning

confidence: 99%

Effect of low temperature tensile properties on crack driving force for Arctic applications

Dahl

Ren

Akselsen

et al. 2018

Theoretical and Applied Fracture Mechanics

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“…Furthermore, the analysis reveals that Equation (4), should be based on the load transmitted across the ligament and on the notch opening displacement. This was indeed the interpretation taken in (4,5,20).…”

Section: S Possible Criterion For a Valid Jic Test Is R > 50 Jic/oy (3)mentioning

confidence: 95%

“…The dynamic fracture initiation test employed in this study was first introduced by Costin et al (20), subsequently used in other experiments (4,5), and further modified in the present investigation as outlined below.…”

Section: -2 Description Of the Fracture Initiation Experimentsmentioning

confidence: 99%

Effects of Prior Austenite and Ferrite Grain Size on Fracture Properties of a Plain Carbon Steel.

Couque¹,

Duffy²,

Asaro³

1984

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“…Analytical [6,7], experimental [8][9][10][11] and numerical [12,7] methods allowed estimation of the temperature variation field near the crack tip and these studies show that this increase in the temperature can change the fracture mechanisms under monotonic loading.…”

Section: Introductionmentioning

confidence: 99%

Thermal effect of plastic dissipation at the crack tip on the stress intensity factor under cyclic loading

Ranc¹,

Palin‐Luc²,

Paris³

2011

Engineering Fracture Mechanics

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. a b s t r a c tPlastic dissipation at the crack tip under cyclic loading is responsible for the creation of an heterogeneous temperature field around the crack tip. A thermomechanical model is proposed in this paper for the theoretical problem of an infinite plate with a semi-infinite through crack under mode I cyclic loading both in plane stress or in plane strain condition. It is assumed that the heat source is located in the reverse cyclic plastic zone. The proposed analytical solution of the thermo-mechanical problem shows that the crack tip is under compression due to thermal stresses coming from the heterogeneous stress field around the crack tip. The effect of this stress field on the stress intensity factor (its maximum and its range) is calculated analytically for the infinite plate and by finite element analysis. The heat flux within the reverse cyclic plastic zone is the key parameter to quantify the effect of dissipation at the crack tip on the stress intensity factor.

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The effect of loading rate and temperature on fracture initiation in 1020 hot-rolled steel

Cited by 53 publications

References 11 publications

Effect of low temperature tensile properties on crack driving force for Arctic applications

Effect of low temperature tensile properties on crack driving force for Arctic applications

Effects of Prior Austenite and Ferrite Grain Size on Fracture Properties of a Plain Carbon Steel.

Thermal effect of plastic dissipation at the crack tip on the stress intensity factor under cyclic loading

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