Assessment of creep constitutive properties from three-point bending creep test with miniaturized specimens

Zhuang, Fakun; Tu, Shan‐Tung; Zhou, Guo‐Yan; Wang, Qiongqi

doi:10.1177/0309324714537056

Cited by 16 publications

(6 citation statements)

References 29 publications

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“…The latter is capable of measuring both stresses and strains directly, while the former generally requires exerting a constant load on a specimen whose displacement of loading point is recorded in real time. Typically, the conversion of data is achieved through empirical equations or through iterations via finite element method, [5][6][7][8] both of which are based on the theory of continuum mechanics. Thanks to years of relentless efforts, to date complementary testing methods of creep based on SSTT have been put into use.…”

Section: Introductionmentioning

confidence: 99%

Effect of stress regime‐dependent creep behaviour on measurement of creep strain rate based on small specimen techniques

Zhang

Bai

et al. 2018

Fatigue Fract Eng Mat Struct

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Small specimen creep testing technique has become a hot topic of research as bulk materials are not available in many occasions. The stress distributions in the small specimens such as small punch and 3‐point bending specimens are essentially nonuniform. As it is known, the creep deformation/damage accumulation mechanisms exhibited at a high stress regime are not the same as the ones at a lower stress regime for many engineering alloys. The potential measurement errors because of stress regime‐dependent creep behaviour, however, has not been considered in the determination of the creep parameters based on small specimen testing in the previous studies. In this paper, 2 kinds of materials that show different Norton's parameters at the corresponding stress regimes are examined. A simple case of 2‐bar structure is firstly adopted to illustrate the measurement error of creep strain rate because of stress regime‐dependent creep behaviour. Furthermore, clamped beam bending testing and small punch testing are investigated to demonstrate the significance of measurement error using the same materials. It is shown that an error of more than 8 times may occur near the transition point of creep deformation mechanism depending on specimen types and materials. Attention should thus be paid to the selection of stress level in the small specimen testing to avoid significant measurement errors.

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Section: Introductionmentioning

confidence: 99%

Effect of stress regime‐dependent creep behaviour on measurement of creep strain rate based on small specimen techniques

Zhang

Bai

et al. 2018

Fatigue Fract Eng Mat Struct

Self Cite

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“…37,38 The two-bar specimen can produce the fullstage creep curve, but it is difficult to make it very thin to ensure that the two bars fail at the same time. The inverse approaches 39,40 have been adopted in miniaturized testing to obtain creep properties based on the analytical solutions and numerical modeling.…”

Section: Introductionmentioning

confidence: 99%

A miniaturized thin‐plate low cycle fatigue test method at elevated temperature

Maskill

Zhou

et al. 2022

Fatigue Fract Eng Mat Struct

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This study aims to develop a high-temperature low cycle fatigue test method using a nonstandard miniature thin-plate specimen in order to characterize the cyclic viscoplasticity behavior of a component material. For demonstration, fully reversed strain-range controlled low cycle fatigue and creep-fatigue tests at 600 C have been performed for a martensitic steel using standard-sized fullscale specimens and miniaturized thin-plate specimens, respectively. Because the displacement is not directly measured from the uniform gauge section of the miniaturized specimen, a geometry-dependent scaling factor is obtained and used to convert the uniaxial strain. The results obtained are shown that the miniaturized test method developed in this work has exhibited a clear possibility to produce comparable low cycle fatigue data with those that are normally obtained by conventional standard specimen tests.

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“…The two-bar specimen can produce the full stage creep curves, but it is difficult to make it very thin to ensure that the two bars fail at the same time 30 . Inverse approaches 33,[38][39] have been adopted in miniaturized beam/thin-plate bending specimen/small punch creep tests to obtain creep properties, based on analytical solutions and numerical modelling.…”

Section: Introductionmentioning

confidence: 99%

A Miniaturized Thin-Plate Low Cycle Fatigue Test Method at Elevated Temperature

Maskill

Z.X.

et al. 2021

Preprint

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This study aims to develop a high temperature LCF test method using a non-standard miniature thin-plate (MTP) specimen in order to characterize cyclic visco-plasticity behavior of component materials. For demonstration, fully reversed strain-range controlled LCF and creep-fatigue (CF) tests at 600 °C have been performed for a martensitic steel using both standard-sized full-scale (SSFS) and MTP specimens. A scaling factor is determined using cyclic visco-plastic finite element (FE) for geometry constraint evaluation and data conversion based on the reference strain approach. The equivalent energy principal is proposed to assess the geometry constraint effect that non-standard MTP specimen has. The high temperature LCF results from the MTP specimen based on the proposed testing methodology have shown a good agreement with SSFS specimen data under equivalent conditions. The methodology can therefore be used to conduct accurate transferability to achieve equivalent LCF behavior between the conventional standard specimen and the MTP specimen.

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Assessment of creep constitutive properties from three-point bending creep test with miniaturized specimens

Cited by 16 publications

References 29 publications

Effect of stress regime‐dependent creep behaviour on measurement of creep strain rate based on small specimen techniques

Effect of stress regime‐dependent creep behaviour on measurement of creep strain rate based on small specimen techniques

A miniaturized thin‐plate low cycle fatigue test method at elevated temperature

A Miniaturized Thin-Plate Low Cycle Fatigue Test Method at Elevated Temperature

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