Bimodal dwell-fatigue Weibull distribution of forged titanium IMI 834

Toubal, Lotfi; Bocher, Philippe; Moreau, A.

doi:10.1177/1056789514541823

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…According to the work of Toubal et al [56], the dispersion of the fatigue life of polyethylene reinforced with 40%wt of SBF decreases when the Weibull modulus increases. As shown in the results presented in table 2 and with 10 Hz of frequency, Weibull modulus decreases with the increase of strain level, except for 1.17%.…”

Section: Figure 7: Evolution Of Characteristic Life With the Strain Level And Frequencymentioning

confidence: 99%

Fatigue life and residual strength of a short- natural-fiber-reinforced plastic vs Nylon

Mejri

Toubal

Cuillière

et al. 2017

Composites Part B: Engineering

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A new natural fiber composite made of high density polyethylene (HDPE) and short birch fibers (SBF) was developed to replace high-performance thermoplastics (Polyamide) commonly used in gears manufacturing.3-point flexural quasi-static tests were achieved on bending specimens to assess mechanical properties.Comparison between these results and those of polyamide (PA) and neat polyethylene has showed that the polyethylene reinforced with 40%wt of SBF presents tensile and flexural mechanical properties that are higher than those of the PA11 or the neat polyethylene. After static characterisation, fatigue tests were performed to determine ε-N curves and the evolution of residual strength. Then, the fatigue behavior of the studied composite has been compared with that of PA66 and of ultra-high molecular weight polyethylene (UHMWPE). It has been noticed that polyethylene reinforced with 40%wt of SBF presents a high cycle fatigue strength (HCFS) that is more important than that of PA66 and UHMWPE. Consequently, the studied composite represents a good alternative to replace Nylon in spur gears manufacturing.

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Section: Figure 7: Evolution Of Characteristic Life With the Strain Level And Frequencymentioning

confidence: 99%

Fatigue life and residual strength of a short- natural-fiber-reinforced plastic vs Nylon

Mejri

Toubal

Cuillière

et al. 2017

Composites Part B: Engineering

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“…2.5 The damage parameter associated with change in elastic modulus is applied for capturing irreversible changes (microplasticity, microcracks or crack propagation) in the properties of materials during cyclic loading conditions 12 .…”

Section: Damage Definition and Its Evaluationmentioning

confidence: 99%

Methodology for Application of Damage Mechanics Approach to Model High Temperature Fatigue Damage Evolution in a Turbine Disc Superalloy

Kumar,

Vaidya,

Rao

et al. 2023

Def. Sc. J.

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Aeroengine gas turbine components operate under complex loading environments. Turbine disc is one such component which experiences stresses at high temperature and accumulates life critical cyclic damage in the material during usage. This accumulation of cyclic damage results into significant deterioration in material strength which in turn may initiate the failure in these rotating components. This necessitates the need to develop an advanced lifing approach for fatigue life assessment of turbine disc. As there are no available standards for damage mechanics application, an attempt has been made in the present study to develop a methodology for application of damage mechanics approach to model high temperature fatigue damage evolution in a turbine disc Superalloy. High temperature (650oC) stress-controlled fatigue tests on turbine disc alloy have been performed to evaluate parameters for damage mechanics based models. Using this approach, damage evolution has been simulated at specimen level. A good correlation has been observed in the damage mechanics based model’s predicted damage and experimentally determined values.

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“…Like grains, MTRs are described by their size, shape, and orientation and affect material performance as a function of their common spatial distribution as defined by a component orientation distribution function (cODF). Microtexture has profound implications for component fatigue life, driving early subsurface crack nucleation and accelerated crack growth ( [12,13,18,19]). Thus, a non-destructive method to detect and characterize MTRs is needed.…”

Section: Introductionmentioning

confidence: 99%

Estimation of microtexture region orientation distribution functions using eddy current data

Homa¹,

Cherry²,

Wertz³

2021

Inverse Problems

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Microtexture regions (MTRs) within titanium alloys are collections of grains with similar crystallographic orientation. The presence of MTRs can be detrimental to the life of an engine component; as such, a method to detect and characterize MTRs is needed. One potential technique to characterize MTRs is eddy current (EC) testing, which is a nondestructive evaluation technique that is sensitive to the changes in local conductivity due to changes in local crystallographic orientation. While it has been established in the literature that EC methods are sensitive to the presence of MTRs, work has begun only recently to determine the ability of EC to characterize MTRs. In this work, we develop an algorithm to estimate the orientation distribution function of an MTR of interest using EC data. The method relies on an application of the central limit theorem, and the inverse problem is solved in using a likelihood-free technique. Numerical examples using simulated EC data are shown.

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Bimodal dwell-fatigue Weibull distribution of forged titanium IMI 834

Cited by 6 publications

References 23 publications

Fatigue life and residual strength of a short- natural-fiber-reinforced plastic vs Nylon

Fatigue life and residual strength of a short- natural-fiber-reinforced plastic vs Nylon

Methodology for Application of Damage Mechanics Approach to Model High Temperature Fatigue Damage Evolution in a Turbine Disc Superalloy

Estimation of microtexture region orientation distribution functions using eddy current data

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