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Prediction and Regulation of delamination at Flexible Film/Finite-Thickness-Substrate Structure Interfaces

Acta Mechanica Solida Sinica 2024年第2期37卷 238-251页

作者： Yutang Zhou Yunlong Xu Haoran Gong Chenyu Wang Department of Engineering Mechanics Northwestern Polytechnical UniversityXi’an710072China School of Instrumentation Science and Opto-Electronics Engineering Beihang UniversityBeijing100191China

Regulating the surface instability of thin film/substrate structures has been successfully applied to prepare new ductile electronic devices.However,such electronic devices need to be subjected to external loads during operation,which can easily induce delamination of the thin-film electronic device from the substrate.This study aims to investigate the instability characteristics of hard films on flexible substrate surfaces from theoretical analysis and numerical simulation perspectives.Considering finite-thickness substrates,this paper establishes theoretical models for pure bending,bent wrinkle,partial delamination,and total delamination buckling of film/substrate structures based on the nonlinear Euler–Bernoulli beam theory and the principle of minimum energy;then the effects of material and geometric parameters of the structure,interfacial adhesion strength,and pre-strain on the evolutionary path of the four patterns are discussed.The study results show that:the greater Young’s modulus of the substrate is,the larger the parameter region where partial delamination of the film/substrate structure occurs,and the smaller the parameter region where bent wrinkle occurs.By varying Young’s modulus,thickness of the film and substrate,interfacial adhesion coefficient,and pre-strain,the buckling pattern of the structure can be predicted and regulated.The parametric design intervals for each pattern are summarized in the phase diagram.The results of this paper provide theoretical support for the design and reliability evaluation of flexible electronic devices.

关键词： Thin film/finite-thickness-substrate structure delamination Surface instability Pattern evolution

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Experimental and simulation studies on delamination strength of laminated glass composites having polyvinyl butyral and ethyl vinyl acetate inter-layers of different critical thicknesses

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Defence Technology（防务技术） 2018年第4期14卷 313-317页

作者： Ajitanshu Vedrtnam Department of Applied Mechanics Motilal Nehru National Institute of Technology Allahabad Department of Mechanical Engineering Invertis University

The laminated glasses(LGs)composites are gaining popularity as protectivestructural material. delamination strength(DS) of(LGs) with different inter-layers and their different nominal thicknesses were compared. The effect of inter-layer thickness, delamination load, and inter-layer type on DS is clearly observed from this brief study. It is concluded that inter-layer thickness has the significant role in determining the DS of LGs. The statistical analysis confirmed the strong association of DS with inter-layer thickness and the interlayer type. It was found that the LG-PVB composite has the comparatively lower DS than LG-EVA composite and inter-layer thickness has the prominent role in the determination of DS in the LG-EVAcomposite. There is an increment in DS with an increment in critical inter-layer thickness in both LG-EVA and LG-PVBcomposites. The increment in the inter-layer thickness from 0.38 mm to 0.76 mm increases DS significantly; whereas, the further increment in the inter-layer thickness to the higher value has a lesser effect. The finite element model was constituted(without considering the effect of temperature) for determining DS of LG composite. The simulation results were in a good match with experimental results. The results of the present work can be utilized by the design engineers while selecting LG for structural applications.

关键词： delamination strength Composite material PVB Laminated glass Finite element analysis

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delamination strength of HTS tape under transverse tensile stress and its enhancement by using different Ag layer depositing temperatures

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Theoretical & Applied Mechanics Letters 2019年第3期9卷 147-151页

作者： Jun Wang Ce Sun Liu Cong Xingyi Zhang Youhe Zhou Key Laboratory of Mechanics on Disaster and Environment in Western China attached to the Ministry of Education of China Lanzhou University Lanzhou 730000 China Department of Mechanics and Engineering Sciences College of Civil Engineering and Mechanics Lanzhou University Lanzhou 730000 China

For the application of second generation high temperature superconducting coated conductors (CCs) with layered structures, thermal mismatch between different components and electromagnetic force exerted in superconducting layer in a working magnet can cause transverse tensile stress, which would result in delamination behavior. Therefore many research groups have designed experiments to measure the delamination strength and dedicate to improving that. However, the reason of the discrete distribution of measured data has still not get quantitatively studied, besides, there are lack of investigations on the method of changing depositing conditions to improve the delamination strength except by adding an additional metal layer. In this work, we adopt an anvil test device and obtain delamination strengths as 29.6 MPa of YBa2Cu3O7-x (YBCO)/buffer and 114.6 MPa of buffer/substrate by combing energy disperse spectroscopy (EDS) detection. The reason of discretized measurement data on the delamination strength is explained. Moreover, we find that different temperatures during Ag deposition determine the bonding force of Ag and YBCO layer. The delamination strength between Ag and YBCO layer increases from 4.4 MPa to larger than 114.6 MPa with temperature elevated from 30℃ to 100℃. Hence we present a novel method for improving the delamination strength of YBCO CCs by setting an optimal temperature of Ag deposition.

关键词： YBCO coated conductor Transverse tensile stress delamination strength Depositing temperature Energy disperse spectroscopy

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Investigating the influence of delamination on the stiffness of composite pipes under compressive transverse loading using cohesive zone method

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Frontiers of Structural and Civil Engineering 2019年第6期13卷 1316-1323页

作者： Sattar MALEKI Roham RAFIEE Abolfazl HASANNIA Mohammad Reza HABIBAGAHI Department of Mechanical Engineering Faculty of EngineeringQuchan University of TechnologyQuchan 94771-67335Iran Composites Research Laboratory Faculty of New Sciences and TechnologiesUniversity of TehranTehran ***Iran

The effect of delamination on the stiffness reduction of composite pipes is studied in this research.The stiffness test of filament wound composite pipes is simulated using cohesive zone method.The modeling is accomplished to study the effect of the geometrical parameters including delamination size and its position with respect to loading direction on stiffness of the composite pipes.At first,finite element results for stiffness test of a perfect pipe without delamination are validated with the experimental results according to ASTM D2412.It is seen that the finite element results agree well with experimental results.Then the finite element model is developed for composite pips with delaminated areas with different primary shapes.Thus,the effect of the size of delaminated region on longitudinal and tangential directions and also its orientation with respect to loading direction on delamination propagation and stiffness reduction of the pipes is assessed.

关键词： delamination composite pipes stiffness test cohesive zone method

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The Mexican hat effect on the delamination buckling of a compressed thin film

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Acta Mechanica Sinica 2014年第6期30卷 927-932页

作者： Yin Zhang Yun Liu State Key Laboratory of Nonlinear Mechanics (LNM) Institute of Mechanics Chinese Academy of Sciences Faculty of Information and Automation Kunming University of Science and Technology

Because of the interaction between film and substrate,the film buckling stress can vary significantly,depending on the delamination geometry,the film and substrate mechanical properties.The Mexican hat effect indicates such interaction.An analytical method is presented,and related dimensional analysis shows that a single dimensionless parameter can effectively evaluate the effect.

关键词： Buckling delamination Elastic foundation Thin film Compliant substrate

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Prelithiation design for suppressing delamination in lithium-ion battery electrodes

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Applied Mathematics and Mechanics(English Edition) 2021年第12期42卷 1703-1716页

作者： Yifei QIAN Bo LU Yinhua BAO Yanfei ZHAO Yicheng SONG Junqian ZHANG Department of Mechanics Shanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai UniversityShanghai 200444China Department of Civil Engineering School of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China

Prelithiation has been intensively investigated in high-capacity lithiumion batteries(LIBs).However,the optimization of prelithiation degrees for long service life of LIBs still remains a challenge.The positive effect of prelithiation on suppressing degradation of LIBs,besides directly pursuing the high first Coulomb efficiency which has been widely reported in the literature,is revealed and discussed based on an analytical model focusing on the interfacial delamination in electrodes.For full charge-discharge cycling,well-designed prelithiation can effectively suppress the delamination and reduce the debonding size by approximately 25%,compared with the case without prelithiation.For the strategy combining partial charge-discharge cycling and prelithiation,the largest reversible capacity without debonding can be significantly improved by approximately100%with well-designed prelithiation.This work is expected to provide a prelithiation design principle and further improve the mechanical stability of LIB electrodes.

关键词： prelithiation delamination electrode concentration-dependent property analytical solution

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Effect of delamination on Mechanical Properties of Al-Li Alloy Modified by Rare Earth Element Ce

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Rare Metals 1999年第1期18卷 34-43页

作者：徐磊王永欣赵志龙陈铮西北工业大学陕西西安

Mechanisms influencing the mechanical properties and fractography of alloy 2090+Ce with different aging conditions were examined as a function of delamination and other factors. It is seen that the alloy aged at 150℃ has superior fracture resistance to the one aged at 163℃ and the practice of aging at 150℃ for 28 h renders the alloy better strength toughness combination than that of aging at 163℃ for 20 h, due to higher effect of intrinsic toughening of the former. With crack extension, failure mechanism in CT specimens changes from a tougher one to a more brittle one because of increasing strain in the frontal zone of crack tip. Moreover, a model for the improvement of toughness of the alloy, as well as monolithic laminated materials, is developed based on the observation of delamination process.

关键词： Al Li alloy Aging Strength Toughness delamination

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Two-dimensional analysis of progressive delamination in thin film electrodes

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Acta Mechanica Sinica 2018年第2期34卷 359-370页

作者： Mei Liu Bo Lu Dong-Li Shi Jun-Qian Zhang Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Department of Mechanics Shanghai University Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai University Materials Genome Institute Shanghai University

By employing the two-dimensional analysis, i.e.,plane strain and plane stress, a semi-analytical method is developed to investigate the interfacial delamination in electrodes. The key parameters are obtained from the governing equations, and their effects on the evolution of the delamination are evaluated. The impact of constraint perpendicular to the plane is also investigated by comparing the plane strain and plane stress. It is found that the delamination in the plane strain condition occurs easier, indicating that the constraint is harmful to maintain the structure stability. According to the obtained governing equations, a formula of the dimensionless critical size for delamination is provided, which is a function of the maximum volumetric strain and the Poisson’s ratio of the active layer.

关键词： Lithium-ion battery Thin film electrode delamination Critical size

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Effects of delamination in drilling glass/polyester composite

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Frontiers of Structural and Civil Engineering 2021年第2期15卷 552-567页

作者： Mehdi GANJIANI Majid SAFARABADI Nabi MEHRI-KHANSARI Hossein ORUJI School of Mechanical Engineering College of EngineeringUniversity of TehranTehran ***Iran Faculty of Mechanical Engineering Sahand University of TechnologyTabriz 513351996Iran

Considering failures during machinery processes such as drilling,a precautionary analysis involving delamination and the corresponding dissipated energy is required,especially for composite structures.In this context,because of the complexity of both the analysis procedure and experimental test setup,most studies prefer to represent mode Ⅰ and Ⅲ interlaminar crack propagation instead of that involving mode Ⅱ.Therefore,in this study,the effect of mode Ⅱ delamination and corresponding interlaminar crack propagation was considered during the drilling process of multilayered glass/polyester composites using both numerical and experimental approaches.In the experimental procedure,the mechanical properties of the glass/polyester specimens were obtained according to ASTM D3039.In addition,the interlaminar mixed-mode(Ⅰ/Ⅱ)loadings were determined using an ARCAN test fixture so that the fracture toughness of glass/polyester could then be identified.The mode Ⅱ critical strain energy release rate(CSERR)was then obtained using an experimental test performed using an ARCAN fixture and the virtual crack closure technique(VCCT).It was determined that the numerical approach was in accordance with the experiments,and more than 95%of crack propagation could be attributed to mode Ⅱ compared to the two other modes.

关键词： delamination VCCT ARCAN specimen drilling modeⅡ

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Detection of small delamination in mullite/Si/SiC model EBC system by pulse thermography

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Journal of Advanced Ceramics 2019年第3期8卷 438-447页

作者： Yutaro ARAI Ryo INOUE Department of Materials Science and Technology Tokyo University of Science6-3-1NiijyukuKatsushika-kuTokyo125-8585Japan Department of Mechanical Engineering Tokyo University of Science6-3-1NiijyukuKatsushika-kuTokyo125-8585Japan

The pulse thermography(PT) technique was applied to the detection of the delamination of a multi-layered coating system composed of mullite/Si onto a reaction-bonded Si C substrate. The potential evaluation was carried out in order to detect internal delamination in multi-layered material system. Moreover, the observation of the cross sections and 3D views obtained by X-ray computed tomography(CT) indicated that the delamination occurred at the interface between the top coat and the bond coat layers. The changes in the temperature distribution obtained by PT indicated the existence of a delamination area in the top coat layer of the mullite. In particular, the lower temperature region corresponded to the delamination area. The experimental results confirmed that the PT technique is effective with respect to the internal delamination of multi-layered coating system.

关键词： environmental barrier coatings (EBCs) delamination pulse thermography (PT) multi-layer image processing

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