Fracture assessment of VO-notches under mode II loading: Experiments and theories

Torabi, A.R.; Amininejad, Sh.

doi:10.1016/j.tafmec.2014.10.010

Cited by 25 publications

(12 citation statements)

References 61 publications

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“…A brief review of the governing equations of the UMTS and UMS criteria presented earlier indicates that the sole unknown parameters are the critical distances. It has several times been demonstrated in the literature that the critical distances of a sharp crack are valid also for notches of various features, for example, V‐notches, U‐notches, V‐notches with end holes (VO‐notches) and key‐hole notches . Thus, the expressions of the critical distances required for drawing the fracture curves are as follows:

r_{c, U} = r_{0} + r_{c} = \frac{ρ}{2} + \frac{1}{2 π} {(\frac{K_{I c}}{σ_{c}})}^{2}; d_{c, U} = r_{0} + d_{c} = \frac{ρ}{2} + \frac{2}{π} {(\frac{K_{I c}}{σ_{c}})}^{2}

…”

Section: Fracture Curves For U‐notched Components Virtually Made Of Tmentioning

confidence: 99%

“…It has several times been demonstrated in the literature that the critical distances of a sharp crack are valid also for notches of various features, for example, V-notches, U-notches, V-notches with end holes (VO-notches) and key-hole notches. [8][9][10][11][12]44,45 Thus, the expressions of the critical distances required for drawing the fracture curves are as follows:…”

Section: Determination Of the Critical Distances For The Umts-emc Andmentioning

confidence: 99%

“…They are known as the small‐scale yielding (SSY), the moderate‐scale yielding, the large‐scale yielding (LSY) and the gross yielding . The failure analysis in the SSY regime is usually carried out by means of brittle fracture criteria that exist in the field of the linear elastic notch fracture mechanics (LENFM) . This can be performed by neglecting the plastic zone or modifying slightly the brittle fracture criteria according to the notch plastic zone size .…”

Section: Introductionmentioning

confidence: 99%

“…1 The failure analysis in the SSY regime is usually carried out by means of brittle fracture criteria that exist in the field of the linear elastic notch fracture mechanics (LENFM). [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] This can be performed by neglecting the plastic zone or modifying slightly the brittle fracture criteria according to the notch plastic zone size. 1 For the other three regimes, the LENFM fracture criteria are no longer valid because the failure mechanism in these regimes is completely different from that in the SSY regime.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of ductile rupture in U‐notched Al 6061‐T6 plates under mixed mode loading

Torabi

Habibi

2015

Fatigue Fract Eng Mat Struct

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A B S T R A C T The aim of the present research is to evaluate ductile failure of U-notched components under mixed mode I/II loading conditions. For this purpose, first, several rectangular plates made of the aluminium alloy Al 6061-T6 and weakened by central bean-shaped slit with two U-shaped ends are tested under mixed mode I/II loading conditions, and the load-carrying capacity of the specimens are experimentally measured. Then, using the equivalent material concept, Al 6061-T6, which is a highly ductile material, is equated with a virtual brittle material, and the load-carrying capacity of the same U-notched specimens virtually made of the equivalent material is theoretically predicted by using two well-known stress-based brittle fracture criteria. Finally, the theoretical failure loads of the virtual specimens are compared with the experimental ones of the real Al 6061-T6 specimens. It is revealed that the experimental results could very well be predicted by means of both brittle fracture criteria without conducting time-consuming elasticplastic analyses.

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r_{c, U} = r_{0} + r_{c} = \frac{ρ}{2} + \frac{1}{2 π} {(\frac{K_{I c}}{σ_{c}})}^{2}; d_{c, U} = r_{0} + d_{c} = \frac{ρ}{2} + \frac{2}{π} {(\frac{K_{I c}}{σ_{c}})}^{2}

…”

Section: Fracture Curves For U‐notched Components Virtually Made Of Tmentioning

confidence: 99%

Section: Determination Of the Critical Distances For The Umts-emc Andmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of ductile rupture in U‐notched Al 6061‐T6 plates under mixed mode loading

Torabi

Habibi

2015

Fatigue Fract Eng Mat Struct

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“…Probably, the most recent investigations on brittle fracture of VO-notched components are those published by Berto et al [66] and Torabi and Ayatollahi [67] under pure compression (i.e., negative mode I loading), by Torabi and Amininejad [68] under pure mode I loading, and by Torabi and Amininejad [69] and Torabi et al [70] under pure mode II loading. At the best of authors' knowledge, no paper or technical report has been published in the open literature dealing with brittle fracture in VO-notches under mixed mode I/II loading.…”

Section: Introductionmentioning

confidence: 99%

Combined tension–shear fracture analysis of V-notches with end holes

et al. 2015

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In the present research, two stress-based failure criteria were proposed to predict brittle fracture in components containing V-notches with end holes (VO-notches) under mixed mode I/II loading. The first criterion, called VO-MTS, was an extension of the maximum tangential stress (MTS) criterion, and the second one, called VO-MS, was developed based on the mean stress (MS) failure concept. Two different groups of critical distances were utilized in the predictions. The first group was equal to the critical distances for sharp crack, and the second one was computed by using the mode I fracture test results on notched specimens. To verify the criteria, the theoretical fracture curves were compared with numerous experimental results gathered from 108 new brittle fracture tests performed on the Brazilian disk specimens weakened by central V-notches with end holes and made of PMMA under mode I and mixed mode I/II loadings. It was found that both the criteria provide very good predictions to the experimental results for different mode mixity ratios. Also, found in this research was that the curves are almost independent of the critical distance groups, meaning that one can simply utilize the critical distances of sharp crack in both the VO-MTS and the VO-MS criteria without requiring performing mode I VO-notch fracture experiments. List of symbolsCTSN Compact-tension-shear-notch CZM Cohesive zone model d Total slit length in the VO-BD specimen D Diameter of the VO-BD specimen d c Critical distance of the MS criterion for sharp cracks d c,vo Critical distance of the MS criterion for VO-notch E Young's modulus ERNFT Effective relative notch fracture toughness FE Finite element FFM Finite fracture mechanics FNR Fictitious notch radius K vo eff Effective relative notch fracture toughness K IC Plane-strain fracture toughness of material K vo I Mode I notch stress intensity factor

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Developing rapid expressions for calculating average strain energy density and J-integral in VO-notched components under tension

Amirinia,

Alirezaeipour,

Safarabadi

et al. 2023

J Braz. Soc. Mech. Sci. Eng.

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Fracture assessment of VO-notches under mode II loading: Experiments and theories

Cited by 25 publications

References 61 publications

Investigation of ductile rupture in U‐notched Al 6061‐T6 plates under mixed mode loading

Investigation of ductile rupture in U‐notched Al 6061‐T6 plates under mixed mode loading

Combined tension–shear fracture analysis of V-notches with end holes

Developing rapid expressions for calculating average strain energy density and J-integral in VO-notched components under tension

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