Stress-based criteria for brittle fracture in key-hole notches under mixed mode loading

Torabi, A.R.; Pirhadi, E.

doi:10.1016/j.euromechsol.2014.06.009

Cited by 50 publications

(22 citation statements)

References 49 publications

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“…However some other researchers have demonstrated that by considering more precise description for the crack tip stress/strain field, more accurate theoretical predictions can be obtained for combined mode fracture of brittle materials . For instance, taking into account the influence of first nonsingular stress term (often called T ‐stress) in addition to K I and K II via the generalized MTS criterion proposed first by Smith et al can reduce significantly the difference between the test data and theoretical predictions of combined mode I + II fracture in several engineering brittle materials . The practical ability of such theoretical frameworks has rarely been investigated till now for crack growth behaviour of aged and unaged bitumen and binder.…”

Section: Resultsmentioning

confidence: 99%

Aging effect on combined mode fracture resistance of bitumen

Shaker

Aliha

Keymanesh

2019

Fatigue Fract Eng Mat Struct

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Crack growth behaviour of aged and unaged 30/40 asphalt binder at subzero temperature was studied both experimentally and theoretically using a test sample called inclined notched bend beam specimen. A series of fracture tests were conducted on this specimen at two subzero temperatures and different combinations of modes I and II. The fracture toughness of tested asphalt binder was significantly dependent on the aging condition such that the load‐carrying capacity of aged bitumen was up to 60% less than the corresponding fracture resistance of unaged bitumen. Moreover, the effective fracture resistance value of tested binder was reduced by increasing the contribution of mode II and also decreasing the test temperature. The obtained experimental results for both binder types were also evaluated theoretically using a stress base crack growth theory.

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Section: Resultsmentioning

confidence: 99%

Aging effect on combined mode fracture resistance of bitumen

Shaker

Aliha

Keymanesh

2019

Fatigue Fract Eng Mat Struct

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“…The critical stress c  for brittle materials has been successfully shown in the literature to be equal to the tensile strength of material (Ayatollahi & Torabi, 2010a, 2010bTorabi, 2013d;Torabi et al, , 2014dTorabi & Amininejad, 2015aTorabi & Pirhadi 2015;Torabi & Abedinasab, 2015a. In order to eliminate c  from Eq.…”

Section: The Umts Criterionmentioning

confidence: 99%

“…Moreover, because EMC acts as a bridge between the linear elastic and elastic-plastic analyses, it is expected that it can basically be linked to various brittle fracture criteria, e.g. the maximum tangential stress (MTS) and mean stress (MS) (Ayatollahi & Torabi, 2010a, 2010bTorabi, 2013d;Ayatollahi et al, 2011aAyatollahi et al, , 2011bAliha & Ayatollahi 2013;Mirsayar et al 2014;Torabi et al, , 2014dTorabi & Amininejad, 2015aTorabi & Pirhadi 2015;Torabi & Abedinasab, 2015a criteria, the averaged strain energy density (ASED) criterion (Lazzarin & Zambardi, 2001;Berto & Lazzarin, 2014;Torabi et al, , 2015cBerto & Barati, 2011;Gomez et al, 2007Gomez et al, , 2009aGomez et al, , 2009bBerto et al, 2007Berto et al, , 2012Berto & Ayatollahi, 2011;Berto & Lazzarin, 2009;Aliha et al 2016), the cohesive zone model (CZM) (Gomez et al, 2000(Gomez et al, , 2006Gomez & Elices, 2003;Cendon 42 et al, 2015) and the finite fracture mechanics (FFM) (Sapora et al, 2013(Sapora et al, , 2015Cornetti et al, 2012Cornetti et al, , 2014Weißgraeber & Becker, 2013;Carpinteri et al, 2008) etc. under different in-plane loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Large plasticity induced crack initiation from U-notches in thin aluminum sheets under mixed mode loadin

Torabi¹,

Hosseini²

2017

10.5267/j.esm

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Ductile failure is investigated experimentally and theoretically in U-notched Al 7075-T6 thin sheets under mixed mode I/II loading. First, several U-notched rectangular sheets are subjected to mixed mode I/II failure tests and the load-carrying capacity of the sheets are experimentally recorded. Then, the Equivalent Material Concept (EMC) is employed in conjunction with the U-notch maximum tangential stress (UMTS) and U-notch mean stress (UMS) criteria to theoretically estimate the load-carrying capacity of the U-notched Al 7075-T6 sheets. It is shown that the experimental failure loads are well predicted by means of both the UMTS-EMC and UMS-EMC criteria. Moreover, the experimental observations and the elastic-plastic finite element analyses indicate that the U-notched aluminum sheets fail by the large-scale yielding (LSY) regime.

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“…Moreover, Kullmer and Richard [62] published a paper related to keyhole notches in which the fracture loads for the compact-tension-shear-notch (CTSN) specimens made of PMMA have been estimated well by means of a stress-based failure criterion. Three recent papers have also been published on brittle fracture of keyhole notches under pure mode I loading by Torabi and Abedinasab [63] and mixed mode I/II loading by Torabi and Pirhadi [64] and Torabi et al [65].…”

Section: Introductionmentioning

confidence: 96%

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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Stress-based criteria for brittle fracture in key-hole notches under mixed mode loading

Cited by 50 publications

References 49 publications

Aging effect on combined mode fracture resistance of bitumen

Aging effect on combined mode fracture resistance of bitumen

Large plasticity induced crack initiation from U-notches in thin aluminum sheets under mixed mode loadin

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

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