Brittle Mixed Mode Fracture I+II: Emanating from Notches -Equivalent Notch Stress Intensity Factor -H

Minor, E. L.; Louah, M.; Azari, Z.; Pluvinage, G.; Kifani, A.

doi:10.1007/978-94-010-0608-8_24

Cited by 5 publications

(11 citation statements)

References 6 publications

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“…The experiments have carried out by examining various U-notched circular ring specimens, with various geometries and boundary conditions ( Fig. 1), [4,5], where: external radius R e = 20 mm, internal radius R i = 10 mm, thickness B = 7 mm, and notch length a = 4 mm. Different notch radii are introduced using a wire-cutting electrical discharge machine and using wires of different diameter.…”

Section: Methodsmentioning

confidence: 99%

“…However, methodology for determination of fracture toughness in mode I and II [2,5,8,10] is well established and since a long time has been given to crack initiation. Since on the one hand, for an elastoplastic ductile material, any crack tip or notch tip will be blunted under loading due to the fracture process zone (volumetric approach), and then lose its singularity from a blunt notch specimen and crack initiation appears preferentially on stress concentration.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evolution of Tenacity in Mixed Mode Fracture – Volumetric Approach

Zebri

Minor

Bendarma

2018

Mechanics and Mechanical Engineering

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In fracture mechanics most interest is focused on stress intensity factors, which describe the singular stress field ahead of a crack tip and govern fracture of a specimen when a critical stress intensity factor is reached. In this paper, stress intensity factors which represents fracture toughness of material, caused by a notch in a volumetric approach has been examined, taking into account the specific conditions of loading by examining various U-notched circular ring specimens, with various geometries and boundary conditions, under a mixed mode I+II. The bend specimens are computed by finite element method (FEM) and the local stress distribution was calculated by the Abaqus/CAE. The results are assessed to determine the evolution of the stress intensity factor of different notches and loading distances from the root of notch. This study shows that the tenacity is not intrinsic to the material for all different geometries notches.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evolution of Tenacity in Mixed Mode Fracture – Volumetric Approach

Zebri

Minor

Bendarma

2018

Mechanics and Mechanical Engineering

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“…On the basis of the SFI and the volumetric approach, through considering the physical mechanism of fatigue initiation and, particularly, on the necessity for a physical volume in which the fatigue process can proceed, authors in previous studies proposed a modified SFI approach, hereafter called as effective stress approach (ESA). In particular, to consider the effect of the real elastic‐plastic stress distribution on fatigue strength, Qylafku et al extended the expression of the relative stress gradient as:

χ^{*} ((), r) = \frac{1}{σ ((),, r, θ = 0)} \frac{\partial σ_{yy} ((),, r, θ = 0)}{\partial r} .

…”

Section: Weighting Control Parameters–based Approachesmentioning

confidence: 99%

Recent advances on notch effects in metal fatigue: A review

Liao

Zhu

Correia

et al. 2020

Fatigue Fract Eng Mat Struct

175

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Notch features including holes, fillets, shoulders, and grooves commonly exist in engineering components. When subjected to external loads, these geometrical discontinuities generally act as stress raisers and thus present significant influences on the component strength and life, which are more remarkable under complex loading paths. Accordingly, numerous theories and approaches have been developed to address notch effects in metal fatigue as well as damage modelling and life predictions, which aim to provide theoretical support for structural optimal design and integrity evaluation. However, most of them are self‐styled or focus on specific objects, which limits their engineering applicability. This review recalls recent developments and achievements in notch fatigue modelling and analysis of metals. In particular, four commonly used methods for fatigue evaluation of metallic notched components/structures are summarized and elaborated, namely, nominal stress approaches, local stress‐strain approaches, and critical distance theories and weighting control parameters‐based approaches, which intend to provide a reference for further research on notch fatigue analysis and promote the integration and/or development among different approaches for practice.

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“…However, no general, brief, practical and low-cost method for determination of k f has yet been formulated [2]. Therefore, as an alternative, the volumetric approach has been introduced [3][4][5] for modeling o f the fatigue failure process. The assumption made in this approach is that the fatigue failure needs a physical volume to occur.…”

Section: Fatigue Life Prediction Of Welded Box Structuresmentioning

confidence: 99%

“…G raphical M ethod of the V olum etric A pproach [3][4][5]. The relative stress gradient is defined as the ratio between the first derivative of stress distribution function and the stress value at a point:…”

Section: Fatigue Life Prediction Of Welded Box Structuresmentioning

confidence: 99%