Subcycle fatigue crack growth formulation under positive and negative stress ratios

Venkatesan, Karthik Rajan; Liu, Yongming

doi:10.1016/j.engfracmech.2017.11.029

Cited by 17 publications

(16 citation statements)

References 17 publications

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“…The proposed timederivative concept uses the analogy approach with respect to a time-derivative fatigue crack growth (FCG) function, proposed in Venkatesan and Liu. 39 The key concept is to treat the damage like a crack in the FCG analysis and assumes the same function type for the rate function and integral. In the time-derivative FCG analysis, the crack length can be calculated by integrating the instantaneous crack growth function with respect to time/loading spectrum.…”

Section: Time-derivative Damage Accumulation Model Under Uniaxial Loadingmentioning

confidence: 99%

“…Therefore, the fatigue life can be directly predicted by integrating the damage with respect to time (alternatively with respect to load history). function, proposed in [34]. The key concept is to treat the damage like a crack in the FCG analysis and assumes the same function type for the rate function and integral.…”

Section: Time-derivative Damage Accumulation Model Under Uniaxial Loa...mentioning

confidence: 99%

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Energy‐based time derivative damage accumulation model under uniaxial and multiaxial random loadings

Tien

Wei

Chen

et al. 2021

Fatigue Fract Eng Mat Struct

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A new fatigue life prediction method using the energy-based approach under uniaxial and multiaxial random loadings is proposed. The uniqueness of the proposed model is based on a time-derivative damage accumulation unlike classical cycle-based damage accumulation models. Thus, damage under arbitrary random loading can be directly obtained using time-domain integration without cycle counting. First, a brief review of existing models is given focusing on their applicability to uniaxial/multiaxial, constant/random, and high cycle fatigue/low cycle fatigue loading regimes. Next, formulation of timederivative damage model is discussed in detail under uniaxial random loadings. Then, an equivalent energy concept for general multiaxial loading conditions is used to convert the random multiaxial loading to an equivalent random uniaxial loading, where the time-derivative damage model can be used. Finally, the proposed model is validated with extensive experimental data from open literature and in-house testing under various constant and random spectrum loadings.

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Section: Time-derivative Damage Accumulation Model Under Uniaxial Loadingmentioning

confidence: 99%

Section: Time-derivative Damage Accumulation Model Under Uniaxial Loa...mentioning

confidence: 99%

Energy‐based time derivative damage accumulation model under uniaxial and multiaxial random loadings

Tien

Wei

Chen

et al. 2021

Fatigue Fract Eng Mat Struct

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“…The rotational effects of the rotor shaft generate a dynamic of opening and closing the fissure, which will generate, through work cycles, fatigue fracture that has a behavior similar to the fragile fracture. The fissure behavior takes the structure of the Paris equation, as in [14,15].…”

Section: Fracture Dynamics In the Rotor Shaftmentioning

confidence: 99%

Modeling and Speed Tuning of a PMSM with Presence of Fissure Using Dragonfly Algorithm

et al. 2020

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This paper presents a robust trajectory tracking control for a Permanent Magnet Synchronous Motor (PMSM) with consideration a fault, parametric uncertainties and external disturbances by effectively integrating robust optimal linear quadratic control. One kind of fault is considered in the machine, particularly the presence of fissure rotor. The dynamic model of the PMSM with the presence of fissure presents highly non-linear behaviors, which means that tuning is quite complicated, which the tuning was chosen through swarm intelligence optimization (Dragonfly Algorithm). A sensitivity analysis is carried out, in order to limit the search range to minimize the evaluation time. This methodology was used to diminish these defects during motor operation. Simulation results show that the optimal linear quadratic control method has a robust fault-tolerant performance.

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“…Se propone el comportamiento de fisura del eje del rotor como consecuencia de la variación del esfuerzo en el mismo, ocasionado por la carga externa T l , los efectos rotativos del eje del rotor generan una dinámica de apertura y cierre de la fisura, lo que generará, a través de los ciclos de trabajo, la fractura por fatiga que tiene un comportamiento similar a la fractura frágil, como se ilustra en la Figura 1 (Venkatesan K. et al, 2018).…”

Section: Dinámica De La Fractura En El Eje Del Rotorunclassified

Modelado y Análisis de Sintonización de Velocidad de un MSIP con Presencia de Fisura Mediante Algoritmos Genéticos

Garcia

Cambero

Anieva

2019

Rev. iberoam. autom. inform. ind.

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ResumenEn el presente artículo se propone el modelado del sistema continuo correspondiente al motor síncrono de imanes permanentes (MSIP) con presencia de degradación en la inercia rotacional del rotor, mediante el mecanismo de fisura, lo cual permite la estimación de parámetros físicos, en el caso de análisis, el diámetro de la grieta presente en el rotor, disminuyendo con ello la incertidumbre en el modelado del MSIP. Se lleva a cabo la identificación en bucle cerrado de las ganancias mediante un análisis de sensibilidad, donde mediante el método computacional de optimización de búsqueda por algoritmos genéticos se obtienen las ganancias que logran converger el modelo propuesto al modelo de referencia. Palabras Clave:Modelado del sistema continuo, Estimación de parámetro, Incertidumbre en el modelado, Identificación en bucle cerrado, Método computacional de optimización, Degradación en Inercia, Mecanismo de Fisura, Sensibilidad, Algoritmo genético. Modeling and Analysis of speed tuning of a PMSM with presence of crack using genetic algorithms AbstractIn this article, we propose the continuous system model corresponding to the Permanent Magnet Synchronous Motor (PMSM) with the presence of degradation in the rotational inertia of the rotor through the fissure mechanism, which allows the estimation of the physical parameters. We consider the diameter of the split on the rotor in the analysis of the model, and in effect, the decrease of the uncertainty of the PMSM model. The closed-loop identification of the gains is achieved by a sensibility analysis, whilst the gains obtained by the computational optimization method of search through genetic algorithms, allows the proposed model converge to the reference model.

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Subcycle fatigue crack growth formulation under positive and negative stress ratios

Cited by 17 publications

References 17 publications

Energy‐based time derivative damage accumulation model under uniaxial and multiaxial random loadings

Energy‐based time derivative damage accumulation model under uniaxial and multiaxial random loadings

Modeling and Speed Tuning of a PMSM with Presence of Fissure Using Dragonfly Algorithm

Modelado y Análisis de Sintonización de Velocidad de un MSIP con Presencia de Fisura Mediante Algoritmos Genéticos

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