Application of creep small punch testing in assessment of creep lifetime

Dobeš, F.; Milička, K.

doi:10.1016/j.msea.2008.04.087

Cited by 69 publications

(31 citation statements)

References 18 publications

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“…(3). This type of relation for the small punch creep test has been reported to occur in other works (Dobes and Milicka, 2009). All the above characteristics are commonly observed in the creep curves corresponding to the conventional creep test.…”

Section: Creep Behaviorsupporting

confidence: 82%

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Small punch creep test in a 316 austenitic stainless steel

Saucedo‐Muñoz¹,

Komazaki²,

Hashida³

et al. 2015

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ABSTRACT:The small punch creep test was applied to evaluate the creep behavior of a 316 type austenitic stainless steel at temperatures of 650, 675 and 700 °C. The small punch test was carried out using a creep tester with a specimen size of 10×10×0.3 mm at 650, 675 and 700 °C using loads from 199 to 512 N. The small punch creep curves show the three stages found in the creep curves of the conventional uniaxial test. The conventional creep relationships which involve parameters such as creep rate, stress, time to rupture and temperature were followed with the corresponding parameters of small punch creep test and they permitted to explain the creep behavior in this steel. The mechanism and activation energy of the deformation process were the grain boundary sliding and diffusion, respectively, during creep which caused the intergranular fracture in the tested specimens. RESUMEN: Ensayo de termofluencia de indentación en un acero inoxidable austenítico 316.El ensayo de termofluencia por indentación se utilizó para evaluar el comportamiento a la termofluencia en un acero inoxidable austenítico 316. Este ensayo se realizó en una máquina de indentación con muestras de 10×10×0,3 mm a temperaturas de 650, 675 y 700 °C con cargas de 199 a 512 N. Las curvas de termofluencia del ensayo mostraron las tres etapas características observadas en el ensayo convencional de tensión. Asimismo, las principales relaciones de termofluencia entre parámetros como velocidad de termofluencia, esfuerzo, tiempo de ruptura y temperatura se observaron en los parámetros correspondientes al ensayo de indentación, lo que permitió caracterizar el comportamiento de termofluencia en este acero. El mecanismo y la energía de activación del proceso de deformación en la termofluencia corresponden al deslizamiento de los límites de grano y la difusión a través de los mismos, respectivamente, lo cual causó la fractura intergranular en las muestras ensayadas.

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Section: Creep Behaviorsupporting

confidence: 82%

“…Figure 8b shows the plot of the testing load against time to rupture t r for the steel tested at 650 °C and it can be noticed that the time to rupture decreases with the increase in the testing load level. This behavior has been reported (Dobes and Milicka, 2009) to follow the following power law relationship:…”

Section: Creep Behaviormentioning

confidence: 59%

Small punch creep test in a 316 austenitic stainless steel

Saucedo‐Muñoz¹,

Komazaki²,

Hashida³

et al. 2015

REVMETAL

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“…Chakrabarty [15] and, most recently, more researchers [23,24] reported that the necking of the specimen and the strain distribution are influenced by friction, which causes the maximum thinning of the specimen to occur at a certain distance from the centre of the specimen and near the contact boundary. The membrane stretching model is rigorously valid for an exponential hardening law, but it is also applicable to different hardening laws.…”

Section: Strain Solution and Correlation Of The Contact Boundary Anglementioning

confidence: 99%

A study on the evolution of the contact angle of small punch creep test of ductile materials

Cacciapuoti

Sun

McCartney

2016

International Journal of Pressure Vessels and Piping

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“…The tertiary region of the deflection versus time curve is characterised by an acceleration of the crack propagation and the deformation of the disk is governed by inter-granular cavitation [23,24]. A small punch specimen generally experiences the evolution of a necking region, which takes place at an offset from the axis of symmetry of the disk [25][26][27]. Commonly, a crack nucleates at the bottom surface of the specimen, in the necked area, and spreads through the thickness of the disk, leading to the specimen rupture [3,28].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analysis of Initial Plasticity in P91 Steel Small Punch Creep Samples

et al. 2017

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To date, the complex behaviour of small punch creep test (SPCT) specimens has not been completely understood, making the test hard to numerically model and the data difficult to interpret. This paper presents a novel numerical model able to generate results that match the experimental findings. For the first time, pre-strained uniaxial creep test data of a P91 steel at 600 • C have been implemented in a conveniently modified Liu and Murakami creep damage model in order to simulate the effects of the initial localised plasticity on the subsequent creep response of a small punch creep test specimen. Finite element (FE) results, in terms of creep displacement rate and time to failure, obtained by the modified Liu and Murakami model are in good agreement with experimental small punch creep test data. The rupture times obtained by the FE calculations which make use of the non-modified creep damage model are one order of magnitude shorter than those obtained by using the modified constitutive model. Although further investigation is needed, this novel approach has confirmed that the effects of initial localised plasticity, taking place in the early stages of small punch creep test, cannot be neglected. The new results, obtained by using the modified constitutive model, show a significant improvement with respect to those obtained by a 'state of the art' creep damage constitutive model (the Liu and Murakami constitutive model) both in terms of minimum load-line displacement rate and time to rupture. The new modelling method will

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Application of creep small punch testing in assessment of creep lifetime

Cited by 69 publications

References 18 publications

Small punch creep test in a 316 austenitic stainless steel

Small punch creep test in a 316 austenitic stainless steel

A study on the evolution of the contact angle of small punch creep test of ductile materials

Experimental and Numerical Analysis of Initial Plasticity in P91 Steel Small Punch Creep Samples

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