Determination of elastoplastic properties by instrumented sharp indentation

Giannakopoulos, A.E.; Suresh, S.

doi:10.1016/s1359-6462(99)00011-1

Cited by 643 publications

(387 citation statements)

References 14 publications

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“…On the contrary, if h is larger than h c , then this phenomenon is called "sink-in". The degree of "sink-in" or "pile-up" depends on the plastic yield stress and the level of the strain-hardening behavior for ordinary elasticplastic materials [24]. The variable a c in Fig.…”

Section: Spherical Indentation Analysismentioning

confidence: 99%

Spherical indentation hardness of shape memory alloys

Yan

Sun

Liu

2006

Materials Science and Engineering: A

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Using dimensional analysis and the finite element method, the spherical indentation hardness of SMAs is investigated. The scaling relationship between the hardness and the mechanical properties of a SMA, such as the forward transformation stress, the maximum transformation strain magnitude, has been derived. Numerical results demonstrated that the hardness increases with the indentation depth but there is no threefold relationship between the hardness and the forward transformation stress. Increasing the maximum transformation strain magnitude would reduce the hardness of the material. These research results enhance our understanding of the hardness from the spherical indentation of SMAs.

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Section: Spherical Indentation Analysismentioning

confidence: 99%

Spherical indentation hardness of shape memory alloys

Yan

Sun

Liu

2006

Materials Science and Engineering: A

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“…With the help of indentation tests carried out on different scales, a wide range of materials can be characterized: metals, alloys, ceramics, concrete [3] or even graded materials [4][5][6][7][8] and the test can also be applied to an actual structure without the need for cutting-out a specimen for tensile testing. Indentation-based assessment of material properties usually relies on the recorded force-displacement curve (P-h curve) [9][10][11][12] obtained in two main phases. In the loading phase, a hard indenter is pressed against the specimen surface.…”

Section: Introductionmentioning

confidence: 99%

Identification of material properties using indentation test and shape manifold learning approach

Liang

Breitkopf

Raghavan

et al. 2015

Computer Methods in Applied Mechanics and Engineering

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The conventional approach for the identification of the work hardening properties of a material by an indentation test usually relies on the force-displacement curve. However, finite element modeling of the indenter-specimen system is a complex task, and the unicity of the solution to the inverse problem of identifying material parameters using the force-displacement curve is not always guaranteed. Also, the precise measurement of the displacement of the indenter tip requires the determination of the indenter frame compliance and indenter tip deformation. To alleviate these problems, we propose in this work an approach based solely on the 3D indentation imprint shape measured after indenter withdrawal, rather than relying on the minimization of the pointwise discrepancy between the experimental and simulated indentation curve. We first build a mathematical "shape space" of indentation shapes in which a lower-dimensional manifold of imprints admissible according to a postulated material constitutive law is approximated. Then, we solve the inverse problem by using a series of predictor-corrector algorithms minimizing the distance between the estimated solution and the experimental imprint in this shape space. We finally apply the proposed approach to indentation tests using a spherical tip indenter on two different materials: a C100 steel specimen and a specimen of the AU4G (AA2017) aluminium alloy.

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“…Т Е М -и с с л е д о в а н и е к в а з и к р и с т а л л и-ч е с к о г о с п л а в а i-Al 62. 4 [14,23], указан-ная область включает зону гидростатического давления около нескольких десятых размера отпечатка, то есть непосредственно под отпечатком, и располагающуюся ниже упругопластическую зону. Рассмотрим сначала результаты ТЕМ-исследований для пластической зоны.…”

Section: результаты и обсуждениеunclassified

Деформационное поведение и структура квазикристаллического сплава i-Al-Cu-Fe в окрестности отпечатка наноиндентора

Шалаева¹,

Cелянин²,

Смирнова³

et al. 2018

Физика Твердого Тела

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Для квазикристаллического полизеренного сплава Al 62.4 Cu 25.3 Fe 12.3 с икосаэдрической структурой i выполнены тесты наноиндентирования, по диаграммам нагрузка (P)−смещение (h) оценены вклады пласти-ческой деформации (монотонной и прерывистой) и проведены электронно-микроскопические исследования структуры поперечных срезов в окрестности отпечатков индентора. Показано, что в упруго-пластической зоне в окрестности отпечатка формируется несколько систем деформационных полос по плотноупакованным плоскостям i-решетки с осями симметрии пятого и второго порядка, полосы нередко начинаются от трещин и проявляют признаки дислокационной структуры. Следы фазового превращения с образованием частиц β-фазы обнаружены только в тонком слое под индентором. Эффекты прерывистой деформации составляют до 50% от общей неупругой деформации и связываются с пластическим поведением квазикристалла -активацией и прохождением деформационных полос, а также с образованием подповерхностных микро-и наноразмерных трещин.Работа поддержана Российским фондом фундаментальных исследований (грант 16-02-00085).

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Determination of elastoplastic properties by instrumented sharp indentation

Cited by 643 publications

References 14 publications

Spherical indentation hardness of shape memory alloys

Spherical indentation hardness of shape memory alloys

Identification of material properties using indentation test and shape manifold learning approach

Деформационное поведение и структура квазикристаллического сплава i-Al-Cu-Fe в окрестности отпечатка наноиндентора

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