Local fracture toughness measurements in polycrystalline cubic zirconia using micro-cantilever bending tests

Henry, Ronan; Blay, Thierry; Douillard, Thierry; Descamps‐Mandine, Armel; Zacharie-Aubrun, I.; Gatt, Jean-Marie; Langlois, Cyril; Meille, Sylvain

doi:10.1016/j.mechmat.2019.103086

Cited by 36 publications

(17 citation statements)

References 42 publications

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“…The apparent fracture stress σ0 locally reached in specimens is calculated by a beam theory solution with equation 1. Pc is the fracture load measured on the load-displacement curve of the nanoindenter, L the distance between the point of load application and the beam basis, S the distance between the beam basis and the fracture plane (FIGURE 3), z the height between the surface of the specimen and its center of gravity and IG its moment of inertia (detailed in [14]).…”

Section: Methodsmentioning

confidence: 99%

Interface failure in nacre-like alumina

Henry

Saad

Doitrand

et al. 2020

Journal of the European Ceramic Society

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Among many bioinspired materials contenders, ceramic-ceramic composites based on alumina platelets have recently emerged as a new class of strong and damage-resistant materials. These materials are brick-and-mortar composites, where bricks are single-crystal alumina platelets, and a glassy interphase acts as the mortar. Although several processing approaches have been reported to date, these materials were optimized so far by trial-and-error approaches. Understanding the fracture properties of nacre-like alumina requires the knowledge of the properties of each of its components. However, only the properties of alumina platelets have been evaluated so far. Here we characterize at a micro scale the fracture property of an aluminosilicate glass interphase between alumina platelets. Micro-cantilever specimens prepared by FIB milling are tested under bending in order to characterize the failure of interfaces exhibiting orientations between 0° and 90° with respect to the beam direction, and thus undergoing different combined shear and tensile stress. Failure appears to be mainly driven by the interface opening stress that seems to predominate over shear stress. The apparent fracture stresses vary from 0.5 GPa to 3.0 GPa depending on the interface angle. It results in a maximum opening stress of 0.72 ± 0.18 GPa reached locally at the interface, whereas the apparent tensile fracture stress of a pack of aligned and perpendicular platelets is approximately 3 GPa. These results should help understand the bulk properties of nacre-like alumina composites and future similar materials and enable a rational design of their components and microstructures.

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Section: Methodsmentioning

confidence: 99%

Interface failure in nacre-like alumina

Henry

Saad

Doitrand

et al. 2020

Journal of the European Ceramic Society

Self Cite

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show abstract

“…The apparent fracture stress σ0 locally reached in specimens is calculated by a beam theory solution with equation (1). Pc is the fracture load measured on the load-displacement curve of the nanoindenter, L the distance between the point of load application and the beam basis, S the distance between the beam basis and the fracture plane (FIGURE 3), z the height between the surface of the specimen and its center of gravity and IG its moment of inertia (detailed in [14]).…”

Section: Methodsmentioning

confidence: 99%

Interface Failure in Nacre-like Alumina

Henry¹,

Saad²,

Doitrand³

et al. 2020

Preprint

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<div> <div> <div> <p>Among many bioinspired materials contenders, ceramic-ceramic composites based on alumina platelets have recently emerged as a new class of strong and damage-resistant materials. These materials are brick-and-mortar composites, where bricks are single-crystal alumina platelets, and a glassy interphase acts as the mortar. Although several processing approaches have been reported to date, these materials were optimized so far by trial-and-error approaches. Understanding the fracture properties of nacre-like alumina requires the knowledge of the properties of each of its components. However, only the properties of alumina platelets have been evaluated so far. Here we characterize at a micro scale the fracture property of an aluminosilicate glass interphase between alumina platelets. Micro-cantilever specimens prepared by FIB milling are tested under bending in order to characterize the failure of interfaces exhibiting orientations between 0° and 90° with respect to the beam direction, and thus undergoing different combined shear and tensile stress. Failure appears to be mainly driven by the interface opening stress that seems to predominate over shear stress. The apparent fracture stresses vary from 0.5 GPa to 3.0 GPa depending on the interface angle. It results in a maximum opening stress of 0.72 ± 0.18 GPa reached locally at the interface, whereas the apparent tensile fracture stress of a pack of aligned and perpendicular platelets is approximately 3 GPa. These results should help understand the bulk properties of nacre-like alumina composites and future similar materials and enable a rational design of their components and microstructures. </p> </div> </div> </div>

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“…This is no longer true at the µmscale even if the influence of c σ remains significant, the energy condition takes precedence. Using a micro-indenter, Henry et al [35] carried out bending tests on notched micro-cantilever beams (Figure 10) made of a ceramic material 8Y-FSZ cubic zirconia (E = 216 GPa, ν = 0.22).…”

Section: Influence Of the Tensile Strengthmentioning

confidence: 99%

Finite fracture Mechanics at the micro-scale. Application to bending tests of micro cantilever beams

Jiménez-Alfaro

Leguillon

2021

Engineering Fracture Mechanics

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In the framework of Finite Fracture Mechanics theory, the Coupled Criterion predicts crack onset based, totally or partially according to the situation, on an energy condition. Due to the smallness of the specimens at the micro-scale, this condition may become difficult to be satisfied given the very small volume of the structures, leading to an apparent strengthening. The aim of this work is to analyze how the answer brought by the Coupled Criterion evolves when descending the scales from the cm-scale, to the µm-scale and even nm-scale. It is based on case studies and on comparisons with experiments found in the literature. Obviously, the Coupled Criterion still works at the micro-scale. However, due to the lack of energy caused by the smallness of the specimens, it is in general much sensitive to the toughness whereas it is little sensitive to the tensile strength, making it sometimes difficult to identify this latter parameter. In parallel, the difference between displacement and force controlled loading modes increases when descending the scales and a notch insensitivity appears. Nomenclaturea Notch depth , * A A Scaling coefficients involved in the Coupled Criterion d Notch width E Young's modulus F Applied force c F Critical applied force at failure exp i F Measured applied force on specimen i sim i F Predicted applied force on specimen i using the coupled criterion G Energy release rate c

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Local fracture toughness measurements in polycrystalline cubic zirconia using micro-cantilever bending tests

Cited by 36 publications

References 42 publications

Interface failure in nacre-like alumina

Interface failure in nacre-like alumina

Interface Failure in Nacre-like Alumina

Finite fracture Mechanics at the micro-scale. Application to bending tests of micro cantilever beams

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