Failure initiation at a blunt V-notch tip under mixed mode loading

Priel, Esther; Yosibash, Zohar; Leguillon, Dominique

doi:10.1007/s10704-008-9234-2

Cited by 57 publications

(22 citation statements)

References 12 publications

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“…Several failure criteria have been proposed for V-notches (Seweryn and Mróz 1995;Seweryn and Lucaszewicz 2002;Yosibash et al 2006;Priel et al 2007Priel et al , 2008Chen and Ozaki 2008;Ayatollahi and Aliha 2009) and for U-notches (Papadopoulos and Paniridis 1988;Gómez et al 2007Gómez et al , 2008Gómez et al , 2009, providing more or less accurate predictions for the scarce experimental results.…”

Section: Introductionmentioning

confidence: 99%

Fracture of V-notched specimens under mixed mode (I + II) loading in brittle materials

et al. 2009

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The purpose of this research is threefold. First, to provide experimental results of fracture loads for V-notched beams loaded under mixed mode. Second, to check the suitability of fracture criteria based on the cohesive zone model and strain energy density when applied to those samples. And, third, to suggest a very simple fracture criterion, based on the dominance of the local mode I, for notched samples (with different V-notch angles and notch root radii) loaded under mixed (I + II) mode. This proposal unifies predictions for the experimental results obtained under mode I and mixed mode loading. To this end, 36 fracture tests on V-notched beams were performed and reported: three V-notched angles were investigated (90 • , 60 • , 30 • ), four different loadings (mixed modes I and II) were selected and three samples were tested for each configuration.

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Section: Introductionmentioning

confidence: 99%

Fracture of V-notched specimens under mixed mode (I + II) loading in brittle materials

et al. 2009

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“…Extensions of the proposed approach to include the effect of elastic anisotropy Dunn, 1998, 1999;Paggi and Carpinteri, 2008) and the presence of a notch tip radius (Berto et al, 2009;Dini and Hills, 2004a,b;Picard et al, 2006;Priel et al, 2008) will constitute the object of further investigations. The stress characterisation performed by the authors can also aid the development of predictive tools to assess fatigue strength and fracture toughness of components in the presence of notches and complete contacts (see e.g.…”

Section: Resultsmentioning

confidence: 99%

Characteristics of the process zone at sharp notch roots

Hills

Dini

2011

International Journal of Solids and Structures

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a b s t r a c tThe classical Williams solution for the state of stress at the tip of a semi-infinite notch is re-visited and the two-term singular solution re-written in a form making the mode mixity and load magnitude explicit. This is used to show that, for a 270°solid angle, the majority of notch problems exhibit a process zone which is entirely or substantially mode I in character, which in turn means that the notch strength may practically be governed by a single elastic parameter. A method for finding the practical limit on the load and stress intensity ratio where this holds is described.

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“…It was demonstrated that by assuming a sharp V-notch tip some failure criteria predict reasonably well both the crack initiation angle and failure load. Then, Priel et al (2008) found the criterion for sharp V-notch slightly underestimates the experimental loads causing failure which is attributed to a small notch tip radius that blunts the sharp corner. Thus, they discussed the failure initiation at a blunt V-notch tip under mixed loading.…”

Section: Introductionmentioning

confidence: 97%

Effect of non-singular stress on the brittle fracture of V-notched structure

2012

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The traditional brittle fracture criteria for V-notched structures are established on the base of the singular stress field at a V-notch tip where only two singular stress terms are adopted. The non-singular stress terms also play a significant role in determining the stress and strain fields around a V-notch tip, which in turn could affect the fracture character of V-notched structures predicted by the fracture mechanics criteria. In this paper, the effect of the non-singular stress on the brittle fracture properties for the V-notch problem is discussed. Firstly, the stress field around a V-notch tip is described by the Williams asymptotic expansions. At the same time, the stress field far from the V-notch tip is modeled by the conventional boundary element method since there is no stress singularity. By the combination of the Williams asymptotic expansions and the boundary integral equations, the complete stress field at a V-notch tip including several non-singular stress terms can be obtained. Then, three different brittle fracture criteria are introduced to predict the critical loading and initial crack propagation direction of V-notched structures under mixed-mode loading. Comparing with the existed experimental results, it can be found that the degree of accuracy of the predicted results when taking into account the non-singular stress terms is much higher than the predicted ones neglecting the non-singular stress.

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Failure initiation at a blunt V-notch tip under mixed mode loading

Cited by 57 publications

References 12 publications

Fracture of V-notched specimens under mixed mode (I + II) loading in brittle materials

Fracture of V-notched specimens under mixed mode (I + II) loading in brittle materials

Characteristics of the process zone at sharp notch roots

Effect of non-singular stress on the brittle fracture of V-notched structure

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