Creep and creep fracture/damage finite element modelling of engineering materials and structures: an addendum

Mackerle, Jaroslav

doi:10.1016/j.ijpvp.2004.03.007

Cited by 11 publications

(4 citation statements)

References 310 publications

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“…Finite element analyses typically predict the creep deformation with known constants using a constitutive equation [42][43][44][45][46][47][48][49][50][51]. The inverse problem, determining materials constants from the observed deformation, is more challenging.…”

Section: Relation Between Deformed Shape and Stress Exponentmentioning

confidence: 99%

Non-contact measurements of creep properties of niobium at 1985 °C

Lee

Wall

Rogers

et al. 2014

Meas. Sci. Technol.

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The stress exponent in the power-law creep of niobium at 1985 °C was measured by a noncontact technique using an electrostatic levitation facility at NASA MSFC. This method employs a distribution of stress to allow the stress exponent to be determined from each test, rather than from the curve fit through measurements from multiple samples that is required by conventional methods. The sample is deformed by the centripetal acceleration from the rapid rotation, and the deformed shapes are analyzed to determine the strain. Based on a mathematical proof, which revealed that the stress exponent was determined uniquely by the ratio of the polar to equatorial strains, a series of finite-element analyses with the models of different stress exponents were also performed to determine the stress exponent corresponding to the measured strain ratio. The stress exponent from the ESL experiment showed a good agreement with those from the literature and the conventional creep test.

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Section: Relation Between Deformed Shape and Stress Exponentmentioning

confidence: 99%

Non-contact measurements of creep properties of niobium at 1985 °C

Lee

Wall

Rogers

et al. 2014

Meas. Sci. Technol.

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“…As a result, the extrapolation of the stress-lifetime curves obtained at high stress leads to a massive overestimation of lifetimes at low stress and the model proposed by Riedel is implemented for comparison purposes. Hence, much research effort needs to be invested now in developing appropriate constitutive equations to solve the numerical shortcomings of the creep problem [9]. In this study, a copper alloy, which is widely used in the fabrication of aircraft structure components, is investigated to characterise the secondary (or steady state) creep behaviour using Norton's rule, based on the Power Law model towards the formation of the material creep behaviour.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of creep behaviour using the power law model in copper alloy

Ahmad¹,

Curiel-Sosa²,

Rongong³

2017

J. MECH. ENG. SCI.

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This paper presents a numerical strategy for the characterisation of the creep behaviour model of the copper alloy, which is widely used in aircraft applications under creep conditions. The high possibility of the material failing, while operating under load at an elevated temperature, has led to the important study of the creep lifetime prediction analysis, by presenting the Norton's rule based on the Power-law model to describe the secondary creep behaviour of the material. In order to demonstrate the nature of the creep formulation, the SOL 400 modules from MSC Nastran 2014 are implemented in order to conduct the uniaxial tensile test in 2000 N of applied load and 473 K of temperature condition. As a result, the exponential curve is formed from the relationship of the creep strain rate and stress, with a 5.1% error based on the value of the stress exponent, n, between the simulation and experimental results and this was still be acceptable because it was relatively small due to the formulation in the simulation. Consequently, a relation of the creep rate curve can then be plotted with respect to the load steps and the variation patterns due to the stress factor also being discussed. Therefore, the results show a good agreement, which indicates the capability of this model to give an accurate and precise estimation of the secondary creep behaviour of the materials.

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“…Mackerle reviewed the finite element methods applied to creep and creep fracture/damage of engineering materials and structures from the theoretical as well as practical points of view [19]. Masuyama interrupted large-size cross-weld creep rupture testing at given creep life fractions until rupture to measure the hardness, microstructure, and potential drop in the heat affected zones of welds to clarify creep degradation in welds of Mod.9Cr-1Mo steel [20].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Creep Damage and Life Prediction of Superalloy Turbine Blade

Liu

2015

Mathematical Problems in Engineering

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Creep caused failure is an important failure mode of the turbine blade. A numerical approach of life assessment of the superalloy turbine blade is proposed in the present paper based on the Lemaitre-Chaboche creep damage model. Material damage is introduced into each element based on the ANSYS APDL function, and the creep damage effect is considered through the modification of Young’s modulus. At last, the strength life and stiffness life of the blade can be obtained through the maximum damage and maximum creep strain criterion, respectively. The present method can not only consider the effect of creep damage, but also give the time histories of the element stresses, damage, and creep strain. The above life prediction results based on the proposed method are compared with theθprojection method, and the results suggest that the present life prediction method of turbine blade is feasible and turbine blade’s life in the present study is determined by creep fracture rather than creep deformation.

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Creep and creep fracture/damage finite element modelling of engineering materials and structures: an addendum

Cited by 11 publications

References 310 publications

Non-contact measurements of creep properties of niobium at 1985 °C

Non-contact measurements of creep properties of niobium at 1985 °C

Characterisation of creep behaviour using the power law model in copper alloy

Numerical Simulation of Creep Damage and Life Prediction of Superalloy Turbine Blade

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