On the Ability of the Equivalent Material Concept in Predicting Ductile Failure of U-Notches under Moderate- and Large-Scale Yielding Conditions

Torabi, A.R.; Habibi, Rozita; Hosseini, Bahram

doi:10.1134/s1029959915040062

Cited by 41 publications

(73 citation statements)

References 29 publications

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“…The Ritchie-Knott-Rice (RKR) model [27] is one of the most representative mechanistic models, and proposes that cleavage fracture takes place when the stress ahead of the crack tip exceeds a critical value (σ f ) over a characteristic distance which, for the mild steel they tested, was equal to two grain size diameters. In any case, the application of these other criteria may result complex and really time-consuming With the aim of applying both the TCD and the SED to non linear-elastic conditions, but keeping their simple linear-elastic formulation, both approaches will be combined with the Equivalent Material Concept (EMC) [28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Estimation of Fracture Loads in AL7075-T651 Notched Specimens Using the Equivalent Material Concept Combined with the Strain Energy Density Criterion and with the Theory of Critical Distances

Fuentes

Cicero

Berto

et al. 2018

Metals

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Abstract:The main goal of this paper is the application of the Strain Energy Density (SED) criterion and the Theory of Critical Distances (TCD), both of them in combination with the Equivalent Material Concept (EMC), to predict the fracture loads of aluminum alloy Al7075-T651 Compact Tension (CT) specimens containing U-shaped notches. For this purpose, 45 fracture tests were performed combining two rolling orientations (transverse and longitudinal) and 6 notch radii, which cover from crack-type defects (0 mm) up to 2 mm-notch radius. Crack-type specimens are used to define the fracture properties of the material and the rest of the tests are used to check and compare the experimental fracture loads with the loads predicted using the different aforementioned criteria: SED, EMC-SED and EMC-TCD. The theoretical results of the fracture load predictions for the virtual brittle material obtained employing the EMC are in good agreement with the experimental results reported for real samples.

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Section: Introductionmentioning

confidence: 99%

Estimation of Fracture Loads in AL7075-T651 Notched Specimens Using the Equivalent Material Concept Combined with the Strain Energy Density Criterion and with the Theory of Critical Distances

Fuentes

Cicero

Berto

et al. 2018

Metals

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show abstract

“…Torabi et al have experimentally measured the mode I NFT of U‐notched rectangular specimens made of Al 7075‐T6 and Al 6061‐T6 and predicted successfully the experimental results by using EMC in combination with 2 stress‐based brittle fracture criteria, namely, the point stress (PS) and mean stress (MS) criteria. It has been observed during the experiments that the failure in U‐notched Al 7075‐T6 specimens occurs suddenly with a moderate‐scale yielding (MSY) regime, while in Al 6061‐T6 specimens by large‐scale yielding (LSY) regime and in a stable manner . In another research, Torabi et al have re‐predicted well the tensile load‐carrying capacity (LCC) of the thin U‐notched rectangular plates tested reported in Torabi et al by linking EMC to the averaged strain energy density (ASED) criterion, called EMC‐ASED criterion.…”

Section: Introductionmentioning

confidence: 92%

On combination of the equivalent material concept and J‐integral criterion for ductile failure prediction of U‐notches subjected to tension

Majidi

Golmakani

Torabi

2018

Fatigue Fract Eng Mat Struct

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The aim of the present research is to check the capability of the equivalent material concept (EMC) combined with the J‐integral failure criterion, called EMC‐J criterion, in predicting the load‐carrying capacity (LCC) of U‐notched ductile aluminium plates subjected to tension by considering the 2 moderate and large‐scale yielding regimes. For this purpose, first, a set of experimental results on LCC of 2 groups of thin U‐notched rectangular plates made of Al 7075‐T6 and Al 6061‐T6 are gathered from the recent literature. Then, because the Al 7075‐T6 and Al 6061‐T6 plates have ductile behaviour, EMC is employed to avoid performing elastic‐plastic failure analysis for LCC predictions. Up to now, different failure models in the context of the linear‐elastic notch fracture mechanics have been successfully utilized in combination with EMC for ductile failure prediction of notched members. However, this is the first time in this research that J‐integral, as a well‐known brittle failure criterion, is linked to EMC for predicting LCC of the U‐notched rectangular aluminium plates. Finally, it is shown that EMC‐J criterion can predict well the experimental results of tensile LCC.

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“…In this way, a new fully energy‐based combined criterion, known as EMC‐J criterion, has been proposed in Majidi et al in order to estimate the critical loads in some U‐shaped notches out of ductile‐behaving, aluminum components undergoing mixed mode I/II tests. In the first research, the EMC‐J criterion has been applied to failure assessment of U‐shaped notches in some thin rectangular plates made of Al 7075‐T6 and Al 6061‐T6 parts with ductile behavior, previously recorded in Torabi et al In the second work, the critical load in Al 6061‐T6 rectangular parts with U‐shaped notches in mixed mode I/II condition have been estimated by utilizing EMC‐J criterion. Finally, by publishing the two mentioned works, it was proved that LCC of ductile‐behaving samples with U‐shaped notches tested under different in‐plane loads, including pure mode I and mixed mode I/II loading conditions, can be successfully estimated via utilizing EMC‐J criterion .…”

Section: Introductionmentioning

confidence: 99%

J‐integral evaluation for V‐notched ductile plates subjected to tension

Torabi

Majidi

Zabihi

2019

Mat Design & Process Comms

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The present research is focused on checking that if the EMC‐J criterion, which is a combination of Equivalent Material Concept (EMC) and the linear elastic J‐integral expression for blunt V‐notches, could be a suitable evaluation to estimate the critical load in ductile aluminum plates with V‐shaped notches subjected to tension loading, experiencing significant yielding regimes. To proceed, Al 7075‐T6 and Al 6061‐T6 rectangular thin plates with V‐shaped notches are considered based on the recent researches. Due to ductile behavior of the two aluminum alloys, utilization of EMC is necessary to get rid of elastic‐plastic calculations for theoretical estimations, which normally consume so much time and come with complexities. It is worth noting that this research is the first of its kind to estimate the failure load of the ductile specimens with V‐shaped notches subjected to tension by combining the EMC and linear elastic J‐integral for blunt V‐shaped notches. Finally, the evaluations of EMC‐J criterion for blunt V‐notches revealed that it can predict the experimental results of failure load well.

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On the Ability of the Equivalent Material Concept in Predicting Ductile Failure of U-Notches under Moderate- and Large-Scale Yielding Conditions

Cited by 41 publications

References 29 publications

Estimation of Fracture Loads in AL7075-T651 Notched Specimens Using the Equivalent Material Concept Combined with the Strain Energy Density Criterion and with the Theory of Critical Distances

Estimation of Fracture Loads in AL7075-T651 Notched Specimens Using the Equivalent Material Concept Combined with the Strain Energy Density Criterion and with the Theory of Critical Distances

On combination of the equivalent material concept and J‐integral criterion for ductile failure prediction of U‐notches subjected to tension

J‐integral evaluation for V‐notched ductile plates subjected to tension

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