J –CTOD relations in clamped SE(T) fracture specimens including 3-D stationary and growth analysis

Sarzosa, Diego F. B.; Souza, Rodolfo F. de; Ruggieri, Cláudio

doi:10.1016/j.engfracmech.2015.05.014

Cited by 44 publications

(18 citation statements)

References 37 publications

(72 reference statements)

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“…Besides to separately investigate the ability of both parameters to characterise fatigue crack growth, different works [24]- [26] have been reported establishing a relationship between them.…”

Section: Introductionmentioning

confidence: 99%

“…This relationship was corroborated by finite elements results for the complete regime of elastic-plastic deformation and experimental data for A533B steels, HY-80 steels and several other ductile metals. Shih's study was used by Metzger et al [25] and Sarzosa et al [26] to numerically show that this J-CTOD relationship is valid even in cases where crack closure is present [25] and to establish accurate relationships between J and CTOD for use in testing protocols for toughness measurements [26].…”

Section: Introductionmentioning

confidence: 99%

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Characterisation of fatigue crack growth using digital image correlation measurements of plastic CTOD

Vasco-Olmo

Díaz

Antunes

et al. 2019

Theoretical and Applied Fracture Mechanics

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In this work an experimental study of the crack tip opening displacement (CTOD) is performed to evaluate the ability of this parameter to characterise fatigue crack growth. A methodology is developed to measure and to analyse the CTOD from experimental data. The vertical displacements obtained by implementing digital image correlation (DIC) on growing fatigue cracks are used to measure the CTOD. Fatigue tests at stress ratios of 0.1 and 0.6 were conducted on compact tension (CT) specimens manufactured from commercially pure titanium. A sensitivity analysis was performed to explore the effect of the position selected behind the crack tip for the CTOD measurement. The analysis of a full loading cycle allowed identifying the elastic (CTODel) and plastic (CTODp) components of the CTOD. The plastic CTOD was found to be directly related to the nonlinear zone (i.e., plastic deformation) generated at the crack tip during fatigue propagation. Moreover, a linear relationship between da/dN and ΔCTODp independent of the stress ratio was found. Results show that the CTOD can be used as a viable alternative to the stress intensity factor range (ΔK) in characterising fatigue crack propagation since the parameter considers the fatigue threshold and crack shielding in an intrinsic way.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterisation of fatigue crack growth using digital image correlation measurements of plastic CTOD

Vasco-Olmo

Díaz

Antunes

et al. 2019

Theoretical and Applied Fracture Mechanics

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“…The influence of the size of SEN(B) specimen on CTOD was discussed in [28]. In 2015, Sarzosa et al [29] performed the analysis of the J-CTOD relationship for three-dimensional SEN(T) plates for both stationary and growing cracks. Also in 2015, Wang et al [30] proposed empirical equations to calculate the J-integral and CTOD.…”

Section: Introductionmentioning

confidence: 99%

Proposal of the hybrid solution to determining the selected fracture parameters for SEN(B) specimens dominated by plane strain

Graba

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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In the paper, new hybrid (numerical-analytical) methods to calculate the J-integral, the CTOD, and the load line displacement are presented. The proposed solutions are based on FEM calculations which were done for SEN(B) specimens dominated by plane strain condition. The paper includes the verification of the existing limit load solution for SEN(B) specimen with proposal of the new analytical formulae, which were used for building hybrid equations for determining three selected fracture mechanics parameters.

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“…Fracture toughness is used in Engineering Critical Assessment (ECA) to assess the fitness‐for‐service of engineering structures with respect to avoidance of fracture . Differences in the values of fracture toughness measurements on the same specimen using different methods could result in a structure being considered safe or not.…”

Section: Introductionmentioning

confidence: 99%

“…Fracture toughness is used in Engineering Critical Assessment (ECA) to assess the fitness-for-service of engineering structures with respect to avoidance of fracture. [1][2][3][4][5] Differences in the values of fracture toughness measurements on the same specimen using different methods could result in a structure being considered safe or not. It is therefore important that the estimation of failure criteria, such as critical flaw size, does not result in over-conservative design, while still ensuring structural integrity.…”

Section: Introductionmentioning

confidence: 99%

Measurement and prediction of CTOD in austenitic stainless steel

Khor

Moore

Pisarski

et al. 2016

Fatigue Fract Eng Mat Struct

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A B S T R A C T Variation of Crack Tip Opening Displacement (CTOD) test values can have a significant effect on the Engineering Critical Assessment of a structure. This paper examines the development of CTOD with increasing load in an austenitic stainless steel. The silicone replication method giving variation of CTOD across the specimen thickness, and Digital Image Correlation (DIC) are compared to each other, and in turn to clip gauge measurements from tests. Results from Finite Element models are also presented. Estimations of CTOD from BS 7448-1, ISO 12135 and ASTM E1820, and a proposed modification from JWES are compared to the experimental data from the crack cast in silicone compound -assumed to be the actual CTOD. The DIC measurement showed consistency with crack replicas, and a formula is given to estimate CTOD using DIC. For high strain hardening austenitic stainless steel, both the JWES and ASTM E1820 estimations provide adequate accuracy for CTOD. N O M E N C L A T U R EA p = plastic area under P versus V p a 0 = initial crack length B = specimen thickness B 0 = remaining ligament, W À a 0 b = position on section as a ratio of B / 2 E = modulus of elasticity J = strain energy around the crack K = stress intensity factor K I = stress intensity factor in mode I loading m = plane strain function used in JWES m ASTM = function relating J to CTOD n = strain hardening exponent P = load r p = rotational factor for plastic hinge assumption V g = clip gauge opening displacement V p = plastic component of clip gauge opening displacement W = specimen width z = knife edge height δ = crack tip opening displacement (CTOD) δ 5 = direct CTOD measurement from two points at the specimen surface 5 mm apart, placed directly at the crack tip δ 5 DIC = δ 5 measured using the DIC technique δ SRC = CTOD measured on the silicone replicas δ FE = CTOD obtained from the FE model v = Poisson's ratio σ ys =0.2% proof strength at test temperature σ uts = ultimate tensile strength at test temperature σ y = flow stress at test temperature, (σ ys + σ uts ) / 2 ε = strain ɳ = geometrical based calibration function for J Correspondence: C. J. Brown.

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J –CTOD relations in clamped SE(T) fracture specimens including 3-D stationary and growth analysis

Cited by 44 publications

References 37 publications

Characterisation of fatigue crack growth using digital image correlation measurements of plastic CTOD

Characterisation of fatigue crack growth using digital image correlation measurements of plastic CTOD

Proposal of the hybrid solution to determining the selected fracture parameters for SEN(B) specimens dominated by plane strain

Measurement and prediction of CTOD in austenitic stainless steel

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