Low-cycle fatigue life prediction for Waspaloy

Yeom, Jong‐Taek; Park, N.K.

doi:10.1179/mht.2002.021

Cited by 12 publications

(5 citation statements)

References 6 publications

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“…The hot ductility has been studied (Andersson et al 2013), as well as its tensile strength and creep behaviour (Wilshire and Scharning 2008), while the density has been estimated to be high, more than 95 % dense (Kamran et al 2008). Further studies on Waspaloy focused on cyclic fatigue loading (Yeom et al 2002), hardness and grain size (Stefan et al 2010), the effect of gamma prime (Pike, 2008), and the electrical and mechanical properties (Whelchel et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Dynamic Impact Response of Nanosized Precipitates Bearing Waspaloy

Onovo

2023

Jou. Eng. Res.

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Dynamic response of nanosized precipitates bearing (NPB) Waspaloy, a class of superalloy, is crucial to design structural components for critical rotating applications and other severe dynamic impact predisposed applications. The focus of this study is, therefore, to investigate the compressive dynamic behaviour of NPB Waspaloy at a high strain rate under various deformation conditions. The technique of modified split Hopkinson pressure (MSHP) bar was implemented through impact deformation of Waspaloy under wide-ranging deformation temperatures (-180 - 750 oC) and strain rates of (4*103 - 7.5*103 s-1). The outcomes of the experiments divulge how to flow stress relates directly to strain rate and is inversely proportional to deformation temperatures. Work hardening rate affects NPB Waspaloy maximally at the iciest deformation temperature (-180 oC) and the highest strain rate (7.5*103 s-1) considered. Under high straining and high rate of straining deformation conditions, the rate with which work-hardening occurs is destabilized due to the thermal softening effect during deformation. It is established that when strain is constant, the flow stress dependency on the rate of straining depicts linear relation. The thermal softening effect on NPB Waspaloy is concerted at around extreme strain rate (7.5*103 s-1) and iciest deformation temperatures within -180 ~ 25 oC. Mapping of strain, strain rate and deformation temperatures representing input parameters with the resultant flow stress provide an unambiguous analytical view of the effects of dynamic impact deformation. Flow stresses at elevated temperatures are correlated directly with grain growth, mainly influenced by adopted deformation temperatures.

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Section: Introductionmentioning

confidence: 99%

Dynamic Impact Response of Nanosized Precipitates Bearing Waspaloy

Onovo

2023

Jou. Eng. Res.

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“…Several approaches based on the Coffin-Manson equation were investigated for the prediction of low cyclic fatigue (LCF) life [7]. However, the methods were not so successful in predicting the lives of materials under asymmetric strain loading conditions [8]. There are two reasons for this viz.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Testing and Numerical Simulation of the Fracture Toughness of Magnesium Alloy AM60 under Impact Loading

Zeng¹,

Chen²,

Gao

et al. 2009

MSF

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The mechanical testing for magnesium alloy AM60 was conducted on an MTS servohydrolic material testing system. In order to examine the effects of impact velocity on fracture toughness, finite element method was applied to compute the impact fracture toughness of AM60 specimens with single notched edge at room temperature. The specimens were impacted by steel balls (Diameter 20 mm) at the velocities of 80m/s, 120m/s and 160m/s. The simulation results well described the effects of impact velocities on fracture toughness. The finite element analysis performed in this work offered an effective method to compute dynamic fracture toughness for engineering applications.

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“…The life prediction methods have developed remarkably in the last decade and most of the methods now consider the accumulative damage by creep and fatigue. In the previous work [2], several approaches for the low-cycle fatigue life were investigated based on the cyclic test results of Waspaloy. From the review, a continuum damage model considering the accumulation of creep and fatigue damages was established as the most useful approach to cover broad ranges of low-cycle fatigue loading.…”

Section: Introductionmentioning

confidence: 99%

Continuum Damage Model of Creep-Fatigue Interaction in Ni-Base Superalloy

Yeom

Lee

Kim

et al. 2007

KEM

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A methodology for evaluating and predicting component lives in creep-fatigue interaction region was investigated for Waspaloy. A unified viscoplasticity constitutive equation including multi-back stresses was used to describe cyclic material behaviors. Also, a continuum damage model coupling with the creep-fatigue damage rules was established based on the analysis of creep and low cycle fatigue behavior. Multi-axial fatigue and creep equivalent stress concepts were employed to predict three dimensional component lives. Notched cyclic tests under various stress conditions in the creep-fatigue interaction region were carried out to validate the life prediction methodology with FEM simulation based on the continuum damage model. The comparison of experimental data and prediction results indicates that the continuum damage model is a powerful approach for the prediction of component lives.

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Low-cycle fatigue life prediction for Waspaloy

Cited by 12 publications

References 6 publications

Dynamic Impact Response of Nanosized Precipitates Bearing Waspaloy

Dynamic Impact Response of Nanosized Precipitates Bearing Waspaloy

Mechanical Testing and Numerical Simulation of the Fracture Toughness of Magnesium Alloy AM60 under Impact Loading

Continuum Damage Model of Creep-Fatigue Interaction in Ni-Base Superalloy

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