Interface crack between a thin film and an orthotropic substrate under uniform heat flow

Zhuo, Xiaoru; Beom, Hyeon Gyu

doi:10.1007/s00419-015-1076-6

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…Diğer bir çalışmada, silindir üzerinde oluşması varsayılan bir çatlak civarında ani sıcaklık değişimi durumunun oluşturduğu etki incelenmiştir [8]. İnce bir film ile ortotrop kaplama ara yüzeyi üzerindeki çatlak, düzgün ısı akışı altında analiz edilmiştir [9]. Yüksek performanslı beton kullanılarak üretilmiş ince plaklar ile imal edilen yangına maruz sandviç paneller, deneysel yöntemle çalışılmıştır [10].…”

Section: Gi̇ri̇ş (Inroduction)unclassified

Reaktör Gövdesinde Kullanılan Kompozit Levhalardaki Kusurlar Civarında Termal Gerilme Analizi

Bulut

2018

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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Modelling of composite plate using in the reactor body in nuclear energy plants for thermal effect  The analysis of the stress concentration factor at the crack tip which is perpendicular to the interface of two different materials for various geometries and positions  Modelling by using finite element method which was verified analyticallyThe finite element model of the nuclear wall near the cavity perpendicular to the interface, verification of numerical results with analytical solution, variation of the stress concentration factor with respect to the radius of the tip of the cavityPurpose: In this study, the variation of the thermal stress concentration factor was intended to be determined with respect to the radius and the location of the tip of a cavity, which is perpendicular to the interface of two materials having different coefficients of thermal expansion. Theory and Methods:The dimensions of the region including a small cavity is small with respect to those of the reactor composite body so that this region can be modeled by a plate. The difference between the coefficients of thermal expansion was modeled by different temperature on two regions of a single material plate. The numerical model, which was analyzed by Abaqus, was verified by an analytical solution given in the literature. Various geometries of the numerical model were analyzed varying the radius and the location of the tip of the cavity. Results:The variations of the stress concentration factor were obtained with respect to the variations of the radius and location of the tip of the cavity, separately. Furthermore, second degree parabolas were fitted to the results in order to obtain the stress concentration factor when the radius or the distance of the tip to the interface equal to zero. Conclusion:The analogical approach was applied successfully to the numerical model considered here. The verification of the numerical model for the analysis of thermal stress was presented, which can be used to obtain an empirical expression for calculation of the thermal stress concentration factor comparing with some of the experiments in future.

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Section: Gi̇ri̇ş (Inroduction)unclassified

Reaktör Gövdesinde Kullanılan Kompozit Levhalardaki Kusurlar Civarında Termal Gerilme Analizi

Bulut

2018

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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“…A detailed review of the manufacturing techniques can be found in [21][22][23][24][25][26]. FGMs are often used in the coatings of structural elements to protect them from the harmful effects of temperature [8][9][10][11][27][28][29][30][31][32][33][34][35], etc. One of the frequently used variants of FGM arrangement is the combination of ceramics with metal [36,37], but this often leads to the violation of the contact between them.…”

Section: Introductionmentioning

confidence: 99%

Deformation and Strength Parameters of a Composite Structure with a Thin Multilayer Ribbon-like Inclusion

Hutsaylyuk

Piskozub

et al. 2022

Materials

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: Within the framework of the concept of deformable solid mechanics, an analytical-numerical method to the problem of determining the mechanical fields in the composite structures with interphase ribbon-like deformable multilayered inhomogeneities under combined force and dislocation loading has been proposed. Based on the general relations of linear elasticity theory, a mathematical model of thin multilayered inclusion of finite width is constructed. The possibility of nonperfect contact along a part of the interface between the inclusion and the matrix, and between the layers of inclusion where surface energy or sliding with dry friction occurs, is envisaged. Based on the application of the theory of functions of a complex variable and the jump function method, the stress-strain field in the vicinity of the inclusion during its interaction with the concentrated forces and screw dislocations was calculated. The values of generalized stress intensity factors for the asymptotics of stress-strain fields in the vicinity of the ends of thin inhomogeneities are calculated, using which the stress concentration and local strength of the structure can be calculated. Several effects have been identified which can be used in designing the structure of layers and operation modes of such composites. The proposed method has shown its effectiveness for solving a whole class of problems of deformation and fracture of bodies with thin deformable inclusions of finite length and can be used for mathematical modeling of the mechanical effects of thin FGM heterogeneities in composites.

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“…[3][4][5] These flexible devices can be twisted, stretched and bent; however, these advantages bring unexpected damage and shorten their lifetime. [6][7][8] Although there are many strategies, it has been developed to improve the fracture resistance of flexible electronics; that is, by changing the structure of interconnects, [9][10][11][12] it still cannot prevent the degradation of electrical conductivity up to electrical failure due to repeated deformation.…”

Section: Introductionmentioning

confidence: 99%

An electrical resistance degradation model for thin film under fatigue loading

Jia-xing

2020

Fatigue Fract Eng Mat Struct

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While flexible electronics are ready for the market, keeping their good electric conductivity in long-term operation is still one of the inevitable challenges. This paper aims to develop a resistance degradation model based on the analysis of the observed fatigue behaviour of thin films and the premature electric failure of thin films. The material deterioration process due to fatigue is represented by the defined fatigue damage variation based on cracks initiation and growth, which establishes a connective relationship with electric resistance degradation. The developed model is validated to compare with experimental results, and numerical results show that it can accurately predict the fatigue life and electrical resistance degradation of thin films of different thicknesses; therefore, it could be a means to assess the electrical performance of thin films on flexible substrates.

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Interface crack between a thin film and an orthotropic substrate under uniform heat flow

Cited by 6 publications

References 17 publications

Reaktör Gövdesinde Kullanılan Kompozit Levhalardaki Kusurlar Civarında Termal Gerilme Analizi

Reaktör Gövdesinde Kullanılan Kompozit Levhalardaki Kusurlar Civarında Termal Gerilme Analizi

Deformation and Strength Parameters of a Composite Structure with a Thin Multilayer Ribbon-like Inclusion

An electrical resistance degradation model for thin film under fatigue loading

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