Micro-wrinkling and delamination-induced buckling of stretchable electronic structures

Oyewole, Oluwaseun K.; Yu, Donghong; Du, Jinglei; Asare, Joseph; Oyewole, D. O.; Anye, Vitalis C.; Fashina, Adebayo Adeboye; Kana, M. G. Zebaze; Soboyejo, Winston O.

doi:10.1063/1.4922665

Cited by 33 publications

(28 citation statements)

References 56 publications

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“…Oyewole et al . 4 presented the results of experimental and theoretical/computational micro-wrinkles and buckling on the surfaces of stretchable poly-dimethylsiloxane (PDMS) coated with nano-scale Gold (Au) layers. The interfacial delamination occurred along with the buckling was also studied using finite element simulations of the interfacial crack growth.…”

Section: Introductionmentioning

confidence: 99%

Multiscale studies on the nonlinear vibration of delaminated composite laminates–global vibration mode with micro buckles on the interfaces

Xue

Xia

et al. 2017

Sci Rep

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This paper presents a multiscale approach to study the nonlinear vibration of fiber reinforced composite laminates containing an embedded, through-width delamination dividing the laminate into four sub-laminates. The equations of motion are established from macroscopic nonlinear mechanics for plates and shells and micro-mechanics of composite material to allow for the influences of large amplitude, membrane stretching in the neutral plane, and the interactions of the sublaminates. Analytical solutions obtained in this paper reveal that the interaction penalty at the interfaces plays a coupling effect between sublaminates, which eventually alters the vibration characters of the four-sublaminate lamina in macroscopic and microscopic mechanism. From a macro perspective, sub-laminates above and below the delamination vibrate in exactly the same mode in spite of their different stiffness and the four-sublaminate lamina has a consistent global vibration mode. In accompanying with the macro vibration, micro buckles occur on the interfaces of the delamination with amplitude about 10−3 times of that of the global mode. It is found that the vibration frequency is an eigenvalue of the delaminated lamina determined only by the geometry of the delamination. Authentication of the multiscale study is fulfilled by comparing the analytical solutions with the FEA results.

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Section: Introductionmentioning

confidence: 99%

Multiscale studies on the nonlinear vibration of delaminated composite laminates–global vibration mode with micro buckles on the interfaces

Xue

Xia

et al. 2017

Sci Rep

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“…A four-node elemental mesh was used, similar to that in our prior work (Figure 3). 2,3, 16,22,35 Fine mesh were used near the particles and the contact surfaces, where the stress and displacement levels were higher. The bottom boundary of the substrate was also fixed to ensure stability during the simulations.…”

Section: B Computational Modeling Of Surface Contactmentioning

confidence: 99%

Cold welding of organic light emitting diode: Interfacial and contact models

et al. 2016

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This paper presents the results of an analytical and computational study of the contacts and interfacial fracture associated with the cold welding of Organic Light Emitting diodes (OLEDs). The effects of impurities (within the possible interfaces) are explored for contacts and interfacial fracture between layers that are relevant to model OLEDs. The models are used to study the effects of adhesion, pressure, thin film layer thickness and dust particle modulus (between the contacting surfaces) on contact profiles around impurities between cold-welded thin films. The lift-off stage of thin films (during cold welding) is then modeled as an interfacial fracture process. A combination of adhesion and interfacial fracture theories is used to provide new insights for the design of improved contact and interfacial separation during cold welding. The implications of the results are discussed for the design and fabrication of cold welded OLED structures.

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“…The most significant failure in outdoor/field PVs systems are: delamination [23], junction box failure [17], frame breakage [17], cell cracks [24], [25], burn marks [17], potential induced degradation [17], and defective bypass diodes [17]. While on the other, the common failures in laboratory PVs cells include: Interfacial and contact failure [26], delamination [27,28], adhesion loss [29], contact degradation [26], crack due to bending and stretching of organic solar cells [26][27], [30] and cell cracks due to surface texturing [31][32]. Nevertheless, there is a need for more data on the failure, reliability and performance of PV systems that are deployed across the different terrestrial regions around the world.…”

Section: Introductionmentioning

confidence: 99%

A study on the reliability and performance of solar powered street lighting systems

et al. 2017

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This paper presents the results of a study on the reliability and performance of the solar-powered street lighting systems installed at the African University of Science and Technology (AUST) in Nigeria, a hot and humid environment. The technical performance of the systems was studied using the following performance indicators: system energy yield, capture loss, as well as the system performance ratio while the reliability of the systems was examined using a model developed from the findings from the maintenance and fault diagnosis of the systems. The model was used to predict the total failure and survival probability of the systems using the Weibull distribution. The performance evaluation during the monitored period (February 2012 to January 2015) indicated that the performance ratios of the systems vary from 70% to 89% and the energy yields of the systems ranging from 2.87 h/day to 5.57 h/day. The results from the reliability analysis also showed that when the stress concentration factor around the notch between the cable terminals in the charge controller increases, the charge controller will become overheated, which in turn affected other components of the systems. The implications of this study are also discussed for the design and development of future solar-powered street lighting systems.

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Micro-wrinkling and delamination-induced buckling of stretchable electronic structures

Cited by 33 publications

References 56 publications

Multiscale studies on the nonlinear vibration of delaminated composite laminates–global vibration mode with micro buckles on the interfaces

Multiscale studies on the nonlinear vibration of delaminated composite laminates–global vibration mode with micro buckles on the interfaces

Cold welding of organic light emitting diode: Interfacial and contact models

A study on the reliability and performance of solar powered street lighting systems

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