A New Ductility Exhaustion Model for High Temperature Low Cycle Fatigue Life Prediction of Turbine Disk Alloys

Abstract

Based on ductility exhaustion theory and the generalized energy-based damage parameter, a new viscosity-based life prediction model is introduced to account for the mean strain/stress effects in the low cycle fatigue regime. The loading waveform parameters and cyclic hardening effects are also incorporated within this model. It is assumed that damage accrues by means of viscous flow and ductility consumption is only related to plastic strain and creep strain under high temperature low cycle fatigue conditions. In the developed model, dynamic viscosity is used to describe the flow behavior. This model provides a better prediction of Superalloy GH4133's fatigue behavior when compared to Goswami's ductility model and the generalized damage parameter. Under non-zero mean strain conditions, moreover, the proposed model provides more accurate predictions of Superalloy GH4133's fatigue behavior than that with zero mean strains.

An improved Corten-Dolan’s model based on damage and stress state effects

“…These models include damage curve-based models [12,13], models for continuum damage mechanics [6,14], models that consider load interactions [13,15], energy-based damage methods [16][17][18], models based on physical property degradation [19,20], ductility exhaustion methods [21,22], and thermodynamic entropy-based theories [23][24][25].…”

Notice of Retraction A modified non-linear damage accumulation model considering load interaction effects under two-level loading

“…The non-linear fatigue damage accumulation models can be classified into the following categories: damage curve based models [4], continuum damage mechanics models [5,6], interaction between various loadings considered models, energy based damage methods [7][8][9], physical properties degradation based model [7,10], ductility exhaustion based methods [11,12], thermodynamic entropy based damage theories [13,14]. Detail comments on some models can be found in [15].…”

Fatigue Life Estimation of an Aircaft Engine Under Different Load Spectrums

“…About the reliable lifetime evaluation for engine components, researchers have presented several models [7][8][9][10][11][12][13]. For example, Shen [7] put forward a probability-based procedure to predict the reliability of gas turbine engine blades subjected to high cycle fatigue, which provides lifetime design guide lines for blades and an optimal maintenance strategy in management.…”

“…By Measuring the residual stresses, Silveira et al [10] analyzed the effect induced by those scratches produced during the handling and mounting of an aircraft turbine disk on their fatigue life. Recently, Zhu and Huang [11][12][13] developed two models for life prediction considering fatigue-creep interaction for high-temperature structures One model uses the generalized strain energy damage function to predict the life of continuous cyclic loading at elevated temperature [11]. The second one is a ductility exhaustion in which damage accrues by means of viscous flow and ductility consumption is only related to plastic strain and creep strain for turbine disk alloys [12].…”

“…Recently, Zhu and Huang [11][12][13] developed two models for life prediction considering fatigue-creep interaction for high-temperature structures One model uses the generalized strain energy damage function to predict the life of continuous cyclic loading at elevated temperature [11]. The second one is a ductility exhaustion in which damage accrues by means of viscous flow and ductility consumption is only related to plastic strain and creep strain for turbine disk alloys [12]. Moreover, a probabilistic methodology for low cycle fatigue life prediction using Bayes' theorem was developed to quantify model uncertainty resulting from creation of different deterministic model parameters [13].…”