Determination of fracture toughness and fatigue crack growth rate using circumferentially cracked round bar specimens of Al2014T651

Neelakantha, V.L.; Jayaraju, T.; Naik, P.; K, Dilip Kumar; Rajashekar, C.R.; Mohankumar,

doi:10.1016/j.ast.2015.09.023

Cited by 13 publications

(7 citation statements)

References 8 publications

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“…CCRB has been successfully employed to measure the fracture toughness of different materials . It has also been used to evaluate fatigue crack propagation and stress corrosion cracking phenomena in general, or hydrogen assisted cracking in particular. With regard to fatigue, the eccentricity reduces the time to reach the critical situation and increases the instability…”

Section: Introductionmentioning

confidence: 99%

Crack tip field in eccentric circumferentially cracked round bar (CCRB) under tensile loading

Toribio

González

Matos

2018

Fatigue Fract Eng Mat Struct

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In this paper, the stress intensity factor (SIF) is computed in a circumferentially cracked round bar (CCRB) subjected to applied tensile load or to imposed axial displacement, considering that the resistant ligament is circular and exhibits certain eccentricity in relation to the cylinder axis. The computation was performed by means of the finite element method, using a 3‐dimensional model and the J‐integral, the analyzed variables being the diameter and the eccentricity of the circular ligament. Results show that the SIF value is higher at the deepest point of the crack. For a given ligament diameter, an increase of ligament eccentricity (in relation to the bar axis) raises the difference between the SIF values at those points of the crack associated with the maximum and minimum depth. Furthermore, the maximum SIF value is higher for applied tensile load than for imposed axial displacement, mainly for high eccentricities and small diameters of the ligament, as a consequence of a greater rotation of the bar.

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Section: Introductionmentioning

confidence: 99%

Crack tip field in eccentric circumferentially cracked round bar (CCRB) under tensile loading

Toribio

González

Matos

2018

Fatigue Fract Eng Mat Struct

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“…A half circumference v-groove was made on the pipe specimen to affect the desired direction of crack propagation. The v-groove in pipe specimens are used in some research work such as [24] to study the fatigue on the pipe sections. A total of fifteen specimens were produced in the workshop covering three groove depths of 1 mm, 1.2 mm and 1.3 mm.…”

Section: Details Of Tubular Specimensmentioning

confidence: 99%

Dynamic crack propagation in specimens with a surface irregularity

et al. 2020

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Initiation of cracks and their propagation in prescribed orientations on tubular specimens has been made possible on a dynamic fatigue testing rig developed at the University of Aberdeen. This rig was originally designed to perform experiments on single edge notched beams (SENB) [1,2]. Modifications have recently been made so as to accommodate experimental tests on tubular specimens with a range of sizes and other cross sections. Crack initiation at grooves on such specimens has been followed by crack growth. At the same time, lateral oscillations of cracked specimen have been measured, as well as accelerations of base excitation, masses above and below cracked specimen. Forces on these two masses have been observed by two load cells attached at positions close to specimen. These load cells facilitated the measurement of stresses in experiment. Crack length time histories have also been constructed by applying an alternating current potential difference (ACPD) method. Fatigue cracks were initiated at the pre-cut grooves in aluminium tubular specimens. Three specimens with different groove sizes were tested in fifteen individual experiments. A three-dimensional Finite Element model was established for each specimen so as to calculate the stress concentration factor (SCF). This formed the basis of determining the amplitude of forcing input made possible by an electromechanical shaker. The phase shifts of acquired time histories has provided some indication of energy transfer mechanism during fatigue and system dynamic response. Observations of cracked specimen displacement during experiments was compared against calculated displacement from elastic theory. Nonlinear responses were observed, suggesting nonlinear stiffness characteristics of the specimen due to discontinuities introduced by crack growth and plasticity effects. Comparison of damage combinations in experimental observation was made with predictions from BS EN 1999-1-3. All experimental observations of total damage combination were higher than predicted values by the latter code.

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“…[ 1 ] for measuring the fracture toughness K IC of materials [ 2 , 3 , 4 ]. They have been successfully used to study cyclic fatigue crack propagation [ 5 , 6 ], stress corrosion cracking [ 7 ], and corrosion-fatigue [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Stress Intensity Factor (SIF) Solutions and Fatigue Crack Paths in Eccentric Circumferentially Cracked Round Bar (CCRB) in Tension

2023

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In this paper, a numerical modeling was developed to study (on the basis of the Paris law) the fatigue propagation paths of eccentric external (outer) cracks in circumferentially cracked round bars (CCRB) subjected to a cyclic type of loading in the form of either remote tensile loading or imposed axial displacement. Results show how the eccentricity (in relation to the wire axis) of the circular resistant ligament increases with the growth of outer circumferential cracks by subcritical fatigue mechanisms. This phenomenon is more pronounced when the solicitation consists of a remote tensile loading than when it is an axial displacement, when the initial eccentricity of the ligament increases (for a given initial diameter), and when the Paris exponent characteristic of the material rises. The paper also analyzes in depth the different situations regarding contact between crack faces during subcritical cyclic fatigue propagation, covering a wide range of cases including no contact, partial contact, and full contact depending on the ligament diameter (during the process of fatigue crack advance) and the relative eccentricity of the annular crack that loses its axial symmetry in relation to the round bar (cylinder) axis. In addition to the fatigue crack path study, closed-form stress intensity factor (SIF) solutions for the considered geometry (a cylinder with an outer annular crack) are provided in the form of third-degree polynomial expressions as a function of the ligament diameter and the crack eccentricity (both in dimensionless terms).

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Determination of fracture toughness and fatigue crack growth rate using circumferentially cracked round bar specimens of Al2014T651

Cited by 13 publications

References 8 publications

Crack tip field in eccentric circumferentially cracked round bar (CCRB) under tensile loading

Crack tip field in eccentric circumferentially cracked round bar (CCRB) under tensile loading

Dynamic crack propagation in specimens with a surface irregularity

Stress Intensity Factor (SIF) Solutions and Fatigue Crack Paths in Eccentric Circumferentially Cracked Round Bar (CCRB) in Tension

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