Microstructure-sensitive estimation of fatigue life using cyclic thermodynamic entropy as an index for metals

Jirandehi, Arash P.; Khonsari, M. M.

doi:10.1016/j.tafmec.2020.102854

Cited by 22 publications

(27 citation statements)

References 40 publications

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“…The two criteria for the determination of a proper α value 87 [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Microstructure‐sensitive Studies Using Statistical Representationmentioning

confidence: 99%

“…

italicFFE = \int_{0}^{t_{f}} \overset{γ}{true} italicdt = \int_{0}^{t_{f}} \frac{{\overset{w}{true}}_{p}}{T} italicdt,

where

{\dot{w}}_{p}

is the rate of cyclic PSE, T is the steady‐state temperature from the surface of the material, and t f is the time to failure. Based on the earlier model of SEPSE and using the concept of FFE, Jirandehi and Khonsari 87 developed a microstructure‐sensitive and thermodynamically based framework to estimate fatigue life. Finite element simulations were adopted to discretize the thermodynamic laws of cyclic heat generation and to calculate the specimen surface temperature evolution.…”

Section: Microstructure‐sensitive Studies Using Statistical Representationmentioning

confidence: 99%

“…Steps to the microstructure‐sensitive estimation of fatigue life for LCS 1018 at different load amplitudes via the statistical estimation of plastic strain energy (SEPSE) method 87 [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Microstructure‐sensitive Studies Using Statistical Representationmentioning

confidence: 99%

See 2 more Smart Citations

General quantification of fatigue damage with provision for microstructure: A review

Jirandehi

Khonsari

2021

Fatigue Fract Eng Mat Struct

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Recent developments in microstructure‐sensitive computational modeling and experimental verification have provided significant insight on how one can estimate fatigue damage and predict useful life. As a myriad of methods and approaches are available, it is important to understand how to properly utilize them in a unified and efficient framework for the quantification of damage in safety‐critical components such as jet engine fan blades, gas turbine disks, and airframe structural connections. To this end, the microstructure‐sensitive studies considering crystal plasticity are reviewed, and methods for implementing the statistical representations of material microstructure are presented. Finally, a computational crystal plasticity approach utilizing the statistical representation of parameters and a new thermodynamically based framework is suggested.

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“…The two criteria for the determination of a proper α value 87 [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Microstructure‐sensitive Studies Using Statistical Representationmentioning

confidence: 99%

“…

italicFFE = \int_{0}^{t_{f}} \overset{γ}{true} italicdt = \int_{0}^{t_{f}} \frac{{\overset{w}{true}}_{p}}{T} italicdt,

where

{\dot{w}}_{p}

Section: Microstructure‐sensitive Studies Using Statistical Representationmentioning

confidence: 99%

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General quantification of fatigue damage with provision for microstructure: A review

Jirandehi

Khonsari

2021

Fatigue Fract Eng Mat Struct

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“…46 In plastic deformations, the microstructure of material can be altered by the movement and reorientation of dislocations. 47 It was found that ultrasonic vibrations can remarkably enhance the dislocation density and the ratio of dislocation via grain refinement. Additionally, highly repeated contacts between the forming tool and the sheet metal will result in a facilitation of slip system's movement.…”

Section: Forming Limit Diagram (Fld)mentioning

confidence: 99%

A method and apparatus for determination of the ultrasonic-assisted forming limit diagram

Najafizadeh

Rajabi

Hashemi

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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It was recently demonstrated that ultrasonic vibrations could result in lower forming forces and a better surface finish in a wide range of metal forming processes. The Nakazima stretch-forming test is a long-established experimental procedure for the formability evaluation of sheet metals. Today, the development of a standard test is critical for assessing sheet metals’ formability enhancement due to ultrasonic vibrations, which can potentially unlock the material selection limit in various manufacturing applications. This study aims to present a method and apparatus for effectuating the forming limit diagram (FLD). At the same time, high-frequency ultrasonic vibrations are combined with the movement of the forming tool. Taking St14 steel as an example, the mechanical and microstructural properties such as formability, Micro-Vickers hardness, and grain sizes were systematically investigated. Furthermore, the conventional FLD, as well as the novel “Ultrasonic-Assisted Forming Limit Diagram” (UA-FLD), were attained and compared with a nonlinear regression-based approach. The results have indicated that superimposing ultrasonic vibrations with the amplitude of 15µm at the frequency of 20 kHz to the tool would cause a notable enhancement in forming limit diagram, a maximum of 28% increase in hardness, and a 23% reduction in average grain size of the specimens.

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“…In a tribo-system, degradation is accompanied by material removal [30][31][32][33][34][35]. The same physics is involved when one deals with a deterioration of performance in batteries during charging and discharging [36,37], loss of consistency in grease due to shearing action [38][39][40][41], and accumulation of damage in cyclic fatigue [42][43][44][45]. Therefore, it is hypothesized that the degradation can be characterized using the framework of irreversible thermodynamics.…”

Section: Introductionmentioning

confidence: 99%

A Unified Treatment of Tribo-Components Degradation Using Thermodynamics Framework: A Review on Adhesive Wear

Koottaparambil

Khonsari

2021

Entropy

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An extensive survey of open literature reveals the need for a unifying approach for characterizing the degradation of tribo-pairs. This paper focuses on recent efforts made towards developing unified relationships for adhesive-type wear under unlubricated conditions through a thermodynamic framework. It is shown that this framework can properly characterize many complex scenarios, such as degradation problems involving unidirectional, bidirectional (oscillatory and reciprocating motions), transient operating conditions (e.g., during the running-in period), and variable loading/speed sequencing.

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Microstructure-sensitive estimation of fatigue life using cyclic thermodynamic entropy as an index for metals

Cited by 22 publications

References 40 publications

General quantification of fatigue damage with provision for microstructure: A review

General quantification of fatigue damage with provision for microstructure: A review

A method and apparatus for determination of the ultrasonic-assisted forming limit diagram

A Unified Treatment of Tribo-Components Degradation Using Thermodynamics Framework: A Review on Adhesive Wear

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