Role of constraint on the shift of ductile–brittle transition temperature of subsize Charpy specimens

Capelle, J.; Amara, M. Ben; Pluvinage, G.; Azari, Z.

doi:10.1111/ffe.12212

Cited by 8 publications

(6 citation statements)

References 16 publications

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“…5 for positive or negative values of T. The maximum opening stress is indicated by a black spot only for positive T stress. For negative T stress, this maximum occurs for negative values of opening stress and bifurcation cannot occur because the crack surfaces cannot overlap [11]. The bifurcation angle θ * is given when the first derivative of Equation (9) is equal to zero and the second derivative must be negative.…”

Section: √ଶగ ఙ ഇഇmentioning

confidence: 99%

“…Crack extension is modelled by the finite element method using the CTOA criterion coupled with the node release technique. The node release technique algorithm has been presented in an earlier study [11]. It is based on the assumption that cracks grow step by step, and each step has the length of one mesh element.…”

Section: Node Release Technique For Crack Extensionmentioning

confidence: 99%

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The CTOA as a Parameter of Resistance to Crack Extension in Pipes Under Internal Pressure

Amara

Pluvinage²,

Capelle

et al. 2016

Fracture at All Scales

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Different methods of CTOA measurements are described: Optical microscopy coupled with digital image correlation, analytical analysis of experimental load-displacement curves or simulation by Finite Element method. Using a Modified Compact Tension (MCT) specimen at room temperature, tests are performed to measure the value of the CTOA of API 5L X65 pipe steel. The influence of thickness on CTOA has been studied and explained through a "triaxial stress constraint". Crack extension is modelled by the finite element method using the CTOA criterion coupled with the node release technique. Crack velocity, arrest pressure and crack extension at arrest have been determined. Values of the CTOA are not intrinsic to materials. Like other measures of fracture toughness, it is sensitive to geometry and loading mode. This sensitivity can be described by a constraint parameter. For the thickness effect, the constraint parameter T z is very appropriate.

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Section: √ଶగ ఙ ഇഇmentioning

confidence: 99%

Section: Node Release Technique For Crack Extensionmentioning

confidence: 99%

The CTOA as a Parameter of Resistance to Crack Extension in Pipes Under Internal Pressure

Amara

Pluvinage²,

Capelle

et al. 2016

Fracture at All Scales

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“…4 The ductile tearing assessment in a typical engineering critical assessment procedure requires a detailed description of the material fracture resistance, measured by the J-Δa curve. [15][16][17][18] Capelle et al 19 have studied the role of constraint on the shift of the ductile-to-brittle transition temperature. However, previous studies 8- 10 have demonstrated the over-conservatism in J-Δa curves from these standard fracture specimens, including the single-edge-notched bend, SE(B) specimen and the compact tension, C(T) specimen due to the significant crack-front constraint loss in the pipes.…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14] Such constraint difference will impose a marked effect on the measured J-Δa curve. [15][16][17][18] Capelle et al 19 have studied the role of constraint on the shift of the ductile-to-brittle transition temperature. Huang et al 20 have developed constraint-corrected J-Δa curve from standard SE(B) specimens using nine different constraint parameters for pipeline steels based on 3D finite element (FE) analyses.…”

Section: Introductionmentioning

confidence: 99%

An η‐compliance method to estimate the J‐Δa curve for pipes with a circumferential surface crack

Parool

Qian

Koh

2017

Fatigue Fract Eng Mat Struct

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This paper presents an η‐compliance method to measure the J‐Δa curve for pipes with a circumferential surface crack, using the experimentally recorded load versus the crack mouth opening displacement (CMOD) relationship. This study modifies the η method commonly practiced for standard through‐thickness fracture specimens to measure the energy release rate, J, from P‐CMOD curve for pipes with a circumferential surface crack. The non‐dimensional parameter η for the surface‐cracked pipes derives from elastic–plastic finite element analyses. The relationship between the crack size and the CMOD‐based compliance, coupled with crack profiles interpolated linearly between the fatigue crack profile and the crack profile after ductile tearing, allows determining the crack depth corresponding to the measured CMOD compliance. The measured location‐specific J‐Δa curves indicate consistency with the fracture resistance curve measured from through‐thickness fracture specimens at small crack extension levels. The difference between the fracture resistances becomes significantly larger as the crack extends beyond 0.5 mm.

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“…Evolution of the ratio ffiffiffiffiffi ffi 2πr p :σ θθ K Iwith crack propagation direction in the presence of T stress 54. …”

mentioning

confidence: 99%

A review of fracture toughness transferability with constraint and stress gradient

Pluvinage

Capelle

Méliani

2014

Fatigue Fract Eng Mat Struct

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A B S T R A C T In this review paper, only constraint and stress gradient approaches to transferability of fracture toughness are examined. The different constraint parameters are defined and discussed, and one example is given in each case. Factors that influence the constraint are studied. Special attention is given to the actual trends to use the plastic constraint in the material failure master curve and the material transition temperature master curve. The paper also deals on the influence of T stress on the crack path and out-of-plane constraint and on the influence of thickness on fracture toughness. The uses of plasticity with gradient and the relative stress gradient in local fracture approaches are also examined.A = constant A i = Williams' stress distribution parameterŝ A i = HRR stress distribution parameters A P = Constraint parameter A p,c = current plastic zone area A p,ssy = reference plastic zone area A εp,c = area surrounded by the equivalent plastic strain A εp,ref = reference area surrounded by the (ε p ) isolines B = thickness B 0 , B 1 , B 2 and B 3 = constants D = pipe diameter D 0 = length E = Young's modulus F = geometry correction factor G = shear modulus G c = fracture toughness I = complex function of eigenvalues I n = dimensionless integration constant J = path integral J c = fracture toughness J Ic = fracture toughness in plane strain conditions J ref = reference fracture toughness K Ic = fracture toughness for plane strain conditions K Jc = fracture toughness K Iz,c = three-dimensional fracture toughness in pure mode I K 0 = lower bound of the notch fracture toughness K ρ,c = notch fracture toughness K 0 ρ;c = fracture toughness corresponding to T ef,c = 0 L = plastic constraint factor N = strain hardening exponent

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Role of constraint on the shift of ductile–brittle transition temperature of subsize Charpy specimens

Cited by 8 publications

References 16 publications

The CTOA as a Parameter of Resistance to Crack Extension in Pipes Under Internal Pressure

The CTOA as a Parameter of Resistance to Crack Extension in Pipes Under Internal Pressure

An η‐compliance method to estimate the J‐Δa curve for pipes with a circumferential surface crack

A review of fracture toughness transferability with constraint and stress gradient

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