New flat-punch indentation creep testing approach for characterizing the local creep properties at high temperatures

Matschkal-Amberger, Dorothea; Kolb, Markus; Neumeier, Steffen; Gao, Siwen; Hartmaier, Alexander; Durst, Karsten; Göken, Mathias

doi:10.1016/j.matdes.2019.108090

Cited by 14 publications

(2 citation statements)

References 73 publications

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“…Therefore, various indentation creep and relaxation test procedures have been developed for investigating the local, time-dependent mechanical properties. These test procedures promise to provide results comparable to macroscopic tests [7][8][9][10][11][12][13][14]. However, a direct comparison of macroscopic and indentation loading protocols reveals significant differences.…”

Section: Introductionmentioning

confidence: 99%

Nanoindentation creep testing: Advantages and limitations of the constant contact pressure method

Minnert

Durst

2021

Journal of Materials Research

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Different loading protocols have been developed in the past to investigate the creep properties of materials using instrumented indentation testing technique. Recently, a new indentation creep method was presented, in which the contact pressure is kept constant during the creep test segment, similar to the constant stress applied in a uniaxial creep experiment. In this study, the results of constant contact pressure creep tests are compared to uniaxial and constant load hold indentation creep experiments on ultrafine grained Cu and CuAl5. The constant contact pressure method yields similar stress exponents as the uniaxial tests, down to indentation strain rates of 10–6 s−1, whereas the constant load hold method results mainly in a relaxation of the material at decreasing applied pressures. Furthermore, a pronounced change in the power law exponent at large stress reductions is found for both uniaxial and constant contact pressure tests, indicating a change in deformation mechanism of ultrafine grained metals. Graphical abstract

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Section: Introductionmentioning

confidence: 99%

Nanoindentation creep testing: Advantages and limitations of the constant contact pressure method

Minnert

Durst

2021

Journal of Materials Research

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“…Beake 12 used an empirical equation assuming that the total contact depth could be considered as the sum of the plastic, elastic, and time‐dependent viscous portions 13 . Furthermore, indentation creep has been studied through FEM simulations according to various conditional creep tests and constitutive equations in many studies 14–16 …”

Section: Introductionmentioning

confidence: 99%

Research on viscoelastic behavior of semi‐crystalline polymers using instrumented indentation

Liu

et al. 2021

Journal of Polymer Science

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In this study, the viscoelastic behavior of a polyamide 12 (PA12) polymer was evaluated using instrumented indentation technology based on a rheological model. The creep compliance and retardation spectra were obtained to analyze the viscoelastic response during the holding stage according to the rheological model under different preloading conditions. The results showed that the viscoelastic responses were independent of the indentation depth or load under step loading conditions. However, the creep compliance increases, and the peak intensity of the retardation spectrum decreases with a decrease in the preloading rate owing to the structural relaxation observed during the preloading stage under ramp loading conditions. Furthermore, softening dispersion can be completed during the loading stage under continuous stiffness measurement (CSM) conditions. As the preloading strain rate changes, the peak of the retardation spectrum gradually decreases until it disappears completely. Moreover, studies on indentation creep using the CSM method are challenging because of the complicated viscoelastic response observed during the preloading stage.

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Local Mechanical Properties at the Dendrite Scale of Ni-Based Superalloys Studied by Advanced High Temperature Indentation Creep and Micropillar Compression Tests

Haußmann

Neumeier

Kolb

et al. 2020

The Minerals, Metals &Amp; Materials Series

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New flat-punch indentation creep testing approach for characterizing the local creep properties at high temperatures

Cited by 14 publications

References 73 publications

Nanoindentation creep testing: Advantages and limitations of the constant contact pressure method

Nanoindentation creep testing: Advantages and limitations of the constant contact pressure method

Research on viscoelastic behavior of semi‐crystalline polymers using instrumented indentation

Local Mechanical Properties at the Dendrite Scale of Ni-Based Superalloys Studied by Advanced High Temperature Indentation Creep and Micropillar Compression Tests

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