Small punch creep property evaluation by finite element of Kocks-Mecking-Estrin model for P91 at elevated temperature

Al-Abedy, H.K.; Jones, I.A.; Sun, Wei

doi:10.1016/j.tafmec.2018.10.006

Cited by 14 publications

(3 citation statements)

References 23 publications

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“…Having this measurement, it would be possible to estimate the friction coefficient which has a huge impact on the results and therefore on the identified parameters [6, 18, 19]. The friction coefficient was assumed with

\mu =0.2

, which is often used in literature [6, 20].…”

Section: Cd‐spt‐simulations – Calibration and Discussionmentioning

confidence: 99%

Identification of creep parameters from multi‐step relaxation tests on miniaturised specimen

Schirmer,

Selent,

Abendroth

et al. 2023

Proc Appl Math and Mech

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The small punch test (SPT) is a miniaturised method for thermo‐mechanical materials testing. The combination of simple specimen geometry and low required specimen volume is ideal for minimally invasive characterisation and monitoring of the current material condition in technological systems, including nuclear plants.The aim of the present study is to identify creep material properties of the chromium steel P91 (X10CrMoVNb9‐1) via small punch testing. It is examined to which extent a single relaxation test is suitable to replace several creep tests at different force levels. The inverse parameter identification method utilises a non‐linear optimisation approach in order to match the results of simulation and experiment. The simulation is performed using finite element analysis (FEA) and the considered material law aims to represent the high‐temperature behaviour of steels. To this end, a modified Liu–Murakami model is specifically used along with linear elasticity and non‐linear isotropic plasticity. We propose a strategy, that can be used to separately identify the Norton‐parameters from multi‐step relaxation tests performed on one specimen. Thereby, the applied strain (displacement, if utilising SPT) is kept constant after initial loading, which enables stress relaxation within the specimen. In case of the SPT, this behaviour yields a decreasing reaction force which approximately approaches a constant value. During the repeated loading phases, specimen failure may occur, due to further plastification of the specimen. Loading and relaxation cycles are repeated until specimen failure.The identified parameters are validated via small punch creep experiments at different force levels. It will be shown that good agreement is observed when comparing the sets of identified parameters.

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\mu =0.2

, which is often used in literature [6, 20].…”

Section: Cd‐spt‐simulations – Calibration and Discussionmentioning

confidence: 99%

Identification of creep parameters from multi‐step relaxation tests on miniaturised specimen

Schirmer,

Selent,

Abendroth

et al. 2023

Proc Appl Math and Mech

View full text Add to dashboard Cite

show abstract

“…Where fo is the strain rate, Q sd is the activation energy of self-diffusion of copper, R is the ideal gas constant and T is the temperature. The Voce-Kocks model has been used for hot tensile test by Choudhary et al 8 and Angella et al 9 Al-Abedy et al 10 in 2018 proposed the Voce-Kocks model to study the viscoplastic behavior during creep testing, showing a possible relation between the behavior during creep and hot tests.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…Abedy et al 10 used the Kocks model to simulate the small punch creep behavior of the P91 steel at 600 °C. Their numerical results showed the versatility and good predictive capability of the model for representing the visco-plasticity behavior of P91 steel at 600 °C.…”

Section: Numerical Simulationmentioning

confidence: 99%

Hardening and Dynamic Recovery During Hot Compression Test of Copper Simulated as Viscoplastic Material

Torrente

2019

Mat. Res.

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The Norton-Bailey equation was used to simulate by finite elements the hardening and dynamic recovery of copper during the hot compression tests. The constants of Norton-Bailey equation were determined from the Voce-Kocks model. The simulation assumes a Mortar Contact with Coulomb friction and axial symmetry. Numerical results were compared with experiments. Six compression tests were carried out at 804 K, three with a strain rate of 0.1 s -1 and three with a strain rate of 1 s -1 . The results show: The differences between the experiments and the simulations are less than 7.69% for strain rates of 0.1 s -1 , and less than 0.67% for strain rates of 1 s -1 . This shows that the simulation of hardening and dynamic recovery of hot copper is possible with the Norton-Bailey equation. Better numerical results were obtained when the behavior of copper is typical of hardening and dynamic recovery, and this happen for high values of strain rates.

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Machine Learning Applications for The Tensile Property Evaluation of Steel: An Overview

Kalita

Kumar

Davim

2021

Handbook of Smart Materials, Technologies, and Devices

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Small punch creep property evaluation by finite element of Kocks-Mecking-Estrin model for P91 at elevated temperature

Cited by 14 publications

References 23 publications

Identification of creep parameters from multi‐step relaxation tests on miniaturised specimen

Identification of creep parameters from multi‐step relaxation tests on miniaturised specimen

Hardening and Dynamic Recovery During Hot Compression Test of Copper Simulated as Viscoplastic Material

Machine Learning Applications for The Tensile Property Evaluation of Steel: An Overview

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