Delamination cracking in advanced aluminum–lithium alloys – Experimental and computational studies

Kalyanam, S.; Beaudoin, Armand Joseph; Dodds, Robert H.; Barlat, Frédéric

doi:10.1016/j.engfracmech.2009.06.010

Cited by 52 publications

(23 citation statements)

References 25 publications

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“…At composite materials, cracks can originate from the addition particles, for example, inorganic fillers or, in case of metal materials, from grain boundaries and unrecrystallized anisotropic grains (16). In this study, the addition of the glass fiber into the sample can also act as a point of stress concentration, if there is any failure to filling the matrix with the composite and the fiber, possibly indicating the delamination fracture process, which is a complex fracture mechanism with the formation of transverse cracks initially on the order of the glass fiber (17). This may explain the observation of fracture process in a sample subjected to a low number of cycles.…”

Section: Discussionmentioning

confidence: 79%

Fracture process characterization of fiber-reinforced dental composites evaluated by optical coherence tomography, SEM and optical microscopy

et al. 2010

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This study used optical coherence tomography (OCT) compared to scanning electron microscopy (SEM) and optical microscopy (OM) to evaluate qualitatively crack propagation and final fracture in restorative composite materials -Filtek Z250 and Filtek Z350 (3M ESPE) -with fiber reinforcement after cyclic loading. Samples were made using a split mold. Initially, 3-point bending tests were performed to determine the maximum force and tension at the fracture moment using samples without fiber reinforcement. Then, mechanical cycling tests were performed using samples with glass fiber embedded internally. The failures were analyzed using the 3 methods described before. OCT permitted good characterization of internal crack propagation of the dental composites, which, however, could not be visualized by either SEM or OM. OCT was proven to be laboratory research tool that is easy to use, does not require any specific preparation of the samples, and is less expensive than SEM.

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Section: Discussionmentioning

confidence: 79%

Fracture process characterization of fiber-reinforced dental composites evaluated by optical coherence tomography, SEM and optical microscopy

et al. 2010

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“…s seen above, numerical simulation by finite-element-analysis [15] may be used to provide the stress distribution close to the back and the head of delamination crack. Nevertheless, this type of simulation accounts only for one delamination crack and therefore, cannot provide information on the impact of multi-delamination cracks on c K and c J .…”

Section: Resultsmentioning

confidence: 99%

“…secondary cracks parallel to the rolling plane, have been observed on high strength steels [1][2][3][4][5][6][7][8][9][10], aluminum-lithium alloys [11][12][13][14][15], Ti-stabilized stainless steels [16,17] and ultrafine-grained steels [18]. Different types of delamination cracks in combination with different orientations of the specimen direction had been identified [13,19].…”

Section: Introductionmentioning

confidence: 99%

“…Guo et al [1] defined a criterion to estimate when the delamination crack will occur in the case of fracture toughness test. It is assumed that the in-plane strength of the material is c  , and the strength in the thickness direction is zc  and Kalyanam et al [15] show the influence of the stress distribution of a central delamination crack in CT-specimen. Near the tip of the macrocrack, the delamination crack produced a small region of traction free surfaces on the center plane, where the delamination crack is located, which then led to a sharp gradient in stress fields similar to those observed at the outside surface.…”

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confidence: 99%

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Short review: Potential impact of delamination cracks on fracture toughness of structural materials

Arnoult¹,

Ružicková²,

Kunzová³

et al. 2015

Frattura Ed Integrità Strutturale

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ABSTRACT. The current energy policy envisages extended lifetime for the current nuclear power plants (GEN II NPP). This policy imposes a large research effort to understand the ageing of power plant components. In this goal, it is necessary to improve knowledge about safety, reliability and components' integrity for more than forty years of operation. In Central and Eastern Europe, the majority of NPPs are VVER types, where some of the components are produced from austenitic steel 08Ch18N10T. Irradiated 08Ch18N10T may exhibit brittle behavior, namely delamination cracks are found in some cases on the fracture surface of irradiated 08Ch18N10T with elongated δ-ferrite. Delamination cracks have also been observed on the fracture surface of high-strength steels or aluminum-lithium alloys. This article presents a state-of-the art review to provide a detailed analysis of the influence of delamination cracks on the toughness of metal alloys. In general, the delamination cracks are present in metal alloys having a high texture and microstructure anisotropy. Three types of delamination cracks have been observed and are classified as crack arrester delamination, crack divider delamination and crack splitting delamination. The microscopy characterization, 3D fracture theories and computational studies explaining possible causes and effects of delamination cracks on the mechanical properties of metal alloys are presented.

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“…multiphase steels, composite materials and high-strength aluminium alloys this assumption cannot be used. Recently, an anisotropic plastic potential has been used to address delamination fracture in Al-Li-alloy under small scale yielding (SSY) conditions [13]. Apparently, there is a coupling between anisotropy and void growth due to the constraint added in the vicinity of the void.…”

Section: Introductionmentioning

confidence: 99%

Interaction between anisotropic plastic deformation and damage evolution in Al 2198 sheet metal

Steglich

Wafai

Besson

2010

Engineering Fracture Mechanics

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-Deformation anisotropy of sheet aluminium alloy 2198 (Al-Cu-Li) has been investigated by means of mechanical testing of notched specimens and Kahn-type fracture specimens, loaded in the rolling direction (L) or in the transverse direction (T). Fracture mechanisms were investigated via scanning electron microscopy. Contributions to failure are identified as growth of initial voids accompanied by a significant nucleation of a second population of cavities and transgranular failure. A model based on the Gurson-TvergaardNeedleman (GTN) approach of porous metal plasticity incorporating isotropic voids, directiondependent void growth, void nucleation at a second population of inclusions and triaxialitydependent void coalescence has been used to predict the mechanical response of test samples. The model parameters have been calibrated by means of 3D unit cell simulations, revealing the interaction between the plastic anisotropy of the matrix material and void growth. The model has been successfully used to describe and predict direction-dependent deformation behaviour, crack propagation and, in particular, toughness anisotropy.

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Delamination cracking in advanced aluminum–lithium alloys – Experimental and computational studies

Cited by 52 publications

References 25 publications

Fracture process characterization of fiber-reinforced dental composites evaluated by optical coherence tomography, SEM and optical microscopy

Fracture process characterization of fiber-reinforced dental composites evaluated by optical coherence tomography, SEM and optical microscopy

Short review: Potential impact of delamination cracks on fracture toughness of structural materials

Interaction between anisotropic plastic deformation and damage evolution in Al 2198 sheet metal

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