Constraint Effect at the Crack Tip. 2nd Report, Constraint Effect of High Toughness Material.

正紀, 菊池; 政臣, 永井

doi:10.1299/kikaia.64.2367

Cited by 3 publications

(4 citation statements)

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“…In Kikuchi and coworkers' previous papers (8) - (10) the J-R curve becomes high under a low-constraint condition, and a low J-R curve is obtained under a high-constraint condition. In this study, the thick specimen is under a high-constraint condition and the thin specimen is under a low-constraint condition.…”

Section: Discussionmentioning

confidence: 94%

“…Kikuchi and co-workers have published three papers on the effect of the constraint condition on the fracture toughness of the material. In the first paper (8) , the effects of the constraint on the fracture surface and fracture toughness are studied experimentally. In the second paper (9) , numerical simulations are conducted using Gurson's constitutive equation.…”

Section: Introductionmentioning

confidence: 99%

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Study on Thickness Effect of Three-Point-Bend Specimen

Kikuchi

Ishihara

2006

JSME Int. J., Ser. A

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The thickness effect of a three-point-bend (3PB) specimen on dimple fracture behavior is studied experimentally and numerically. At first, fracture toughness tests were conducted using 3PB specimens of different thicknesses. Fracture toughness values and R-curves are obtained, and the thickness effect is discussed. Using scanning electron microscopy (SEM), dimple fracture surfaces are observed precisely. It is found that the thickness effect appears clearly in the void growth process. Finite element (FEM) analyses are conducted based on these experimental data. Using Gurson's constitutive equation, the nucleation and growth of voids during the dimple fracture process are simulated. The distribution patterns of stress triaxiality and the crack growth process are obtained. The results show a good agreement with experimental ones qualitatively. The effects of specimen thickness on R-curves are explained well on the basis of these numerical simulations.

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Section: Discussionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Study on Thickness Effect of Three-Point-Bend Specimen

Kikuchi

Ishihara

2006

JSME Int. J., Ser. A

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“…Many studies have been conducted; Kikuchi and Sannoumaru have published papers on the studies of ductile fracture. In the first paper [1], the thickness effect on the microscopic fracture process and fracture toughness is studied experimentally. In the second paper [2], dimple fracture tests were performed using three point bending specimens.…”

Section: Introductionmentioning

confidence: 99%

Ductile Fracture Simulation of Pipe under Bending with Initial Defects

Kikuchi

Senda

2011

KEM

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Crack propagating evaluation is needed to predict and prevent structural damages since many structure defects from numerous crack propagating. It is widely known that ductile fracture occurs when external load is exerted to the material, these load include strong and unpredictable load such as earthquakes and collision of objects. Ductile material fractures via nucleation of void, growth of void and coalescence of voids. Many studies have been conducted; Kikuchi and Sannoumaru have published papers on the studies of ductile fracture. In the first paper [1], the thickness effect on the microscopic fracture process and fracture toughness is studied experimentally. In the second paper [2], dimple fracture tests were performed using three point bending specimens. In the test, loading condition is changed from mode I to mixed mode condition to study the effect of the mixed mode loading. Numerical simulation is conducted using Gurson’s constitutive equation. It is found that crack growth direction is affected significantly by the loading condition. Ductile fracture of a pipe used in Light Water Reactor components is researched in this paper. Four point bending of a pipe experiment had been done by the Central Research Institute of Electric Power Industry [3]. They were experimented in two conditions; one at room temperature (23 ) and second at high temperature (300 ). As a result, crack propagation behavior differs largely form each other. At room temperature, crack propagates parallel from the pre crack, and at high temperature, crack propagates in a slanting direction from the pre crack. Results show that that difference from the two temperature distinction of a tensile test in a stress strain curve is very little. In this paper, this problem is studied at first by experiments, observation of fracture surface and numerical simulation.

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“…Many studies have been conducted; Kikuchi and Sannoumaru have published papers on the studies of ductile fracture. In the first paper (1) , the thickness effect on the microscopic fracture process and fracture toughness are studied experimentally. In the second paper (2) , dimple fracture tests were performed using three point bending specimens.…”

Section: Introductionmentioning

confidence: 99%