Development and Assessment of a New Empirical Model for Predicting Full Creep Curves

Gray, Veronica; Whittaker, Mark

doi:10.3390/ma8074582

Cited by 12 publications

(10 citation statements)

References 14 publications

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“…Parameters are then derived to describe how this relationship varies with increasing creep strain. Examples of this method include an empirical relationship proposed by Gray and Whittaker [11] and a method based on the Wilshire equations [12,13]. The former method relates times to strain, t ε , to applied test conditions using…”

Section: Creep Deformation 21 Full Creep Curve Prediction Methodsmentioning

confidence: 99%

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Advanced Methods for Creep in Engineering Design

Harrison¹,

Whittaker²,

Gray³

2018

Creep

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There are many applications where the combination of stress and elevated temperature require creep to be considered during the design process. For some applications, an evaluation of rupture life for given conditions is sufficient, however, for components such as those in gas turbine aeroengines, the accumulation of creep strain over time and the effect this has on other phenomena, such as high-temperature fatigue must be considered. In this chapter, modern creep curve modelling methods are applied to alloys used in gas turbine applications over a wide range of test conditions. Also, different creep hardening modelling methods are discussed along with their application to transient creep showing the deficiencies of simplistic models. Models are related to micromechanical properties where possible, and creep damage models are evaluated and applied to different applications using finite element analysis (FEA).

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Section: Creep Deformation 21 Full Creep Curve Prediction Methodsmentioning

confidence: 99%

“…where A 1-7 are material constants, derived from experimental data. This method has been successfully applied to many creep resistant metals and alloys [11].…”

Section: Creepmentioning

confidence: 99%

Advanced Methods for Creep in Engineering Design

Harrison¹,

Whittaker²,

Gray³

2018

Creep

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“…(4]) is that it does not ensure k 3j → k 1j as  →  f . More recently, Gray and Whittaker [14] when studying Waspaloy proposed a model for predicted creep curves that appeared to bypass the Wilshire methodology altogether by working with…”

Section: The Time To Strainmentioning

confidence: 99%

“…The Wilshire equations have shown great potential in reducing the length of the development cycle because it has been shown in the literature to produce reliable failure time and minimum creep rate predictions for operating conditions (or close to) from very short term accelerated tests [3][4][5][6][7][8][9][10][11][12]. However, this literature is quite sparse on how to modify the Wilshire equations so as to be able to predict times to specified strains and therefore complete creep curves [13][14]. Given the importance of strain for developing new aeroengine materials, the aim of this paper is to I. in a novel way rework the existing Wilshire equations, so that whole creep curves can be predicted at any test condition within the experimental range of test conditions and ii.…”

Section: Introductionmentioning

confidence: 99%

Assessing the capability of the Wilshire equations in predicting uniaxial creep curves: An application to Waspaloy

Evans

Williams

2019

International Journal of Pressure Vessels and Piping

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It is important to be able to predict creep strains in aeroengine so as to enable small punch disc test results to be related to uniaxial creep test results using finite element models. The capability of the Wilshire equation to interpolate creep curves was assessed using creep tests on Waspaloy. This assessment required modifying the Wilshire equation for time to strains so that the parameters of this equation could be predicted as a function of strain in a way that did not allow predicted creep curves to double back on themselves. An artificial neural network was used to achieve this. It was found that the modified model was capable of interpolating the shape and the end points of the experimental creep curves. These modifications enabled the activation energy to be measured and it was found that the activation energy is dependent upon the average internal stress and thus strain.

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“…It is supposed to help with the modelling of the laminate failure prediction, which is still under the consideration of science [ 37 , 38 ]. For laminates, the modelling methods used mainly in the case of brittle materials are adapted [ 39 ], but also those applied for nanomaterials [ 40 , 41 ], as well as behavior modelling by long-term [ 42 ] or cyclic [ 43 , 44 ] loads. In order to predict and model the above, it is necessary to understand the structure of the material in laminates; methods similar to those used for the classic materials are used [ 45 ].…”

Section: Introductionmentioning

confidence: 99%

Failure Progress of 3D Reinforced GFRP Laminate during Static Bending, Evaluated by Means of Acoustic Emission and Vibrations Analysis

Kozioł

Figlus

2015

Materials

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The work aimed to assess the failure progress in a glass fiber-reinforced polymer laminate with a 3D-woven and (as a comparison) plain-woven reinforcement, during static bending, using acoustic emission signals. The innovative method of the separation of the signal coming from the fiber fracture and the one coming from the matrix fracture with the use of the acoustic event’s energy as a criterion was applied. The failure progress during static bending was alternatively analyzed by evaluation of the vibration signal. It gave a possibility to validate the results of the acoustic emission. Acoustic emission, as well as vibration signal analysis proved to be good and effective tools for the registration of failure effects in composite laminates. Vibration analysis is more complicated methodologically, yet it is more precise. The failure progress of the 3D laminate is “safer” and more beneficial than that of the plain-woven laminate. It exhibits less rapid load capacity drops and a higher fiber effort contribution at the moment of the main laminate failure.

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Development and Assessment of a New Empirical Model for Predicting Full Creep Curves

Cited by 12 publications

References 14 publications

Advanced Methods for Creep in Engineering Design

Advanced Methods for Creep in Engineering Design

Assessing the capability of the Wilshire equations in predicting uniaxial creep curves: An application to Waspaloy

Failure Progress of 3D Reinforced GFRP Laminate during Static Bending, Evaluated by Means of Acoustic Emission and Vibrations Analysis

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