A computational damage mechanics model for thermomigration

Li, Shidong; Basaran, Cemal

doi:10.1016/j.mechmat.2008.10.013

Cited by 47 publications

(22 citation statements)

References 25 publications

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“…A comprehensive review of applications of entropy concepts in various research areas is given by Martyushev and Seleznev and Amiri and Modarres [2,12]. Entropy can be used to quantify the behavior of irreversible degradation, including plasticity and dislocations [13,14], erosion-corrosion [15], wear and fracture [16][17][18][19][20], fatigue [21][22][23][24][25][26], fretting corrosion [27], thermal degradation [28], and associated failure of tribological components [29,30]. The benefit of employing entropy generation to characterize materials damage is that entropy generation can provide a unified measure of damage, allowing for incorporation of multiple competing and common-cause degradation mechanisms that can be explicitly expressed in terms of physically measurable quantities.…”

Section: Introductionmentioning

confidence: 99%

A Thermodynamic Entropy Approach to Reliability Assessment with Applications to Corrosion Fatigue

Imanian¹,

Modarres²

2015

Entropy

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This paper outlines a science-based explanation of damage and reliability of critical components and structures within the second law of thermodynamics. The approach relies on the fundamentals of irreversible thermodynamics, specifically the concept of entropy generation as an index of degradation and damage in materials. All damage mechanisms share a common feature, namely energy dissipation. Dissipation, a fundamental measure for irreversibility in a thermodynamic treatment of non-equilibrium processes, is quantified by entropy generation. An entropic-based damage approach to reliability and integrity characterization is presented and supported by experimental validation. Using this theorem, which relates entropy generation to dissipative phenomena, the corrosion fatigue entropy generation function is derived, evaluated, and employed for structural integrity and reliability assessment of aluminum 7075-T651 specimens.

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Section: Introductionmentioning

confidence: 99%

A Thermodynamic Entropy Approach to Reliability Assessment with Applications to Corrosion Fatigue

Imanian¹,

Modarres²

2015

Entropy

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“…In our opinion, this was not evident in previous studies based on D parameters. 5,6,13,27 Thus, we plot the curve of added power to the resistor as a function of temperature, P(T), as illustrated in Fig. 12, which shows linear behavior, and we can estimate _ S i from the linear fit.…”

Section: A Damage Characterizationmentioning

confidence: 99%

“…Thus, the combination of current and voltage as electrical variables, along with entropy from thermodynamics, could lead to an accurate description of electrical damage. 6,13,14 Entropy has also been introduced for understanding the physics leading to the failure of oxides in order to obtain accurate models of their reliability. 15,16 Reversible entropy is widely used in adiabatic computing, 17 where heat dissipation must be minimized, and in electrochemical battery research, for characterizing their charge state and health.…”

Section: Introductionmentioning

confidence: 99%

Irreversible entropy model for damage diagnosis in resistors

Cuadras

Crisóstomo

Ovejas

et al. 2015

Journal of Applied Physics

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Entropy and irreversibility in the quantum realm Am. J. Phys. 79, 297 (2011) We propose a method to characterize electrical resistor damage based on entropy measurements. Irreversible entropy and the rate at which it is generated are more convenient parameters than resistance for describing damage because they are essentially positive in virtue of the second law of thermodynamics, whereas resistance may increase or decrease depending on the degradation mechanism. Commercial resistors were tested in order to characterize the damage induced by power surges. Resistors were biased with constant and pulsed voltage signals, leading to power dissipation in the range of 4-8 W, which is well above the 0.25 W nominal power to initiate failure. Entropy was inferred from the added power and temperature evolution. A model is proposed to understand the relationship among resistance, entropy, and damage. The power surge dissipates into heat (Joule effect) and damages the resistor. The results show a correlation between entropy generation rate and resistor failure. We conclude that damage can be conveniently assessed from irreversible entropy generation. Our results for resistors can be easily extrapolated to other systems or machines that can be modeled based on their resistance. V C 2015 AIP Publishing LLC.

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“…Similarly, other forms of degradation such as fretting [28] and fatigue damage of materials are consequences of irreversible processes that tend to increase the entropy generation of in the material [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. Dissipative processes can be directly linked to thermodynamic entropy, or associated thermodynamic energies, for example plasticity, dislocations [7,46], erosion-corrosion [9], wear-fracture [47,48], fretting-corrosion [49], high current density, thermal gradient, stress gradient and chemical gradient [50,51], thermal degradation, and associated failure of tribological components. Feinberg and Widom [52,53] have related material or component parameter degradation to the Gibbs free energy and predicted that change in the system characteristic results from a log-time aging behavior versus time.…”

Section: Review Of Relevant Workmentioning

confidence: 99%

An Entropy-Based Damage Characterization

Amiri

Modarres

2014

Entropy

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This paper presents a scientific basis for the description of the causes of damage within an irreversible thermodynamic framework and the effects of damage as observable variables that signify degradation of structural integrity. The approach relies on the fundamentals of irreversible thermodynamics and specifically the notion of entropy generation as a measure of degradation and damage. We first review the state-of-the-art advances in entropic treatment of damage followed by a discussion on generalization of the entropic concept to damage characterization that may offers a better definition of damage metric commonly used for structural integrity assessment. In general, this approach provides the opportunity to described reliability and risk of structures in terms of fundamental science concepts. Over the years, many studies have focused on materials damage assessment by determining physics-based cause and affect relationships, the goal of this paper is to put this work in perspective and encourage future work of materials damage based on the entropy concept.

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A computational damage mechanics model for thermomigration

Cited by 47 publications

References 25 publications

A Thermodynamic Entropy Approach to Reliability Assessment with Applications to Corrosion Fatigue

A Thermodynamic Entropy Approach to Reliability Assessment with Applications to Corrosion Fatigue

Irreversible entropy model for damage diagnosis in resistors

An Entropy-Based Damage Characterization

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