Mixed-mode ductile failure analysis of V-notched Al 7075-T6 thin sheets

Torabi, A.R.; Alaei, Mohammad Hossein

doi:10.1016/j.engfracmech.2015.10.037

Cited by 52 publications

(46 citation statements)

References 39 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

“…Till now, several researches have been performed on ductile failure in various notched members, by linking EMC to various NFM criteria. For example, Torabi and Alaei tested several V‐notched rectangular samples made of Al 7075‐T6, loaded under mixed Mode I/II, and the LCC values were experimentally measured. They compared the experimental results with the theoretical predictions, obtained from linking EMC to the maximum tangential stress (MTS) and mean stress (MS) criteria, observing a good agreement.…”

Section: Introductionmentioning

confidence: 99%

“…In the literature and some other research works dealing with EMC, it can be clearly found that EMC has been based on an important assumption that a valid fracture thoughness (ie, K Ic or K c ) exists for the ductile material which can be obtained according to ASTM E399 . Such an assumption has been shown to be satisfied in those ductile materials, for which the ultimate and yield strengths are not so different . Because of needing ductile materials with considerable strain‐hardening in design process of engineering structures, eg, the sheet metals in automobile and ship structures etc., LCC prediction for such materials weakened by notches of various shapes is necessary.…”

Section: Introductionmentioning

confidence: 99%

Notch ductile failure with significant strain‐hardening: The modified equivalent material concept

Torabi

Kamyab

2018

Fatigue Fract Eng Mat Struct

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The equivalent material concept (EMC) assumes that the ductile material has a valid K‐based fracture toughness (KIc or Kc). For ductile materials with significant strain‐hardening, no valid KIc or Kc is determined by the standard experiments and, hence, EMC seems null. The modified EMC (MEMC) is proposed in this study by which a virtual Kc value is defined and computed for the ductile material with significant strain‐hardening. In this way, Mode I and mixed Mode I/II fracture behaviors of U‐notched aluminum alloy 5083 are assessed in the view points of experiments and theories. Several U‐notched rectangular samples are used for performing the experiments and obtaining the failure loads. Then, the MEMC is coupled with the maximum tangential stress and mean stress criteria and utilized to predict the failure loads theoretically. Finally, it is shown that both the MEMC‐stress‐based criteria can provide very good predictions of the test data.

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“…They made use of EMC in conjunction with two well-known stress-based brittle fracture criteria, namely the maximum tangential stress (MTS) and mean-stress (MS) criteria, to successfully predict the LCC of rectangular thin plates of Al 7075-T6 and Al 6061-T6 containing central U-notches under mode I loading (Torabi et al, 2015d), that of Al 6061-T6 containing inclined U-notches under mixed mode I/II loading (Torabi & Habibi, 2015), and that of Al 7075-T6 containing inclined blunt V-notches under mixed mode I/II loading (Torabi & Alaei, 2015).…”

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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Mixed-mode ductile failure analysis of V-notched Al 7075-T6 thin sheets

Cited by 52 publications

References 39 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

Notch ductile failure with significant strain‐hardening: The modified equivalent material concept

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

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