Mode Mixity Dependence of Interfacial Fracture Toughness in Organic Electronic Structures

Tong, T.; Tan, Ting; Rahbar, Nima; Soboyejo, Winston O.

doi:10.1109/tdmr.2013.2256788

Cited by 7 publications

(11 citation statements)

References 23 publications

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“…Interfacial interactions between surfaces may also increase the overall energy release rates compared to predictions from AFM calculations when higher mode mixities are present. 45 It is of interest to note that when the computed crack driving forces exceed the measured adhesion energies at crack lengths that are comparable to the range of blister/bubbles sizes (3-50 lm) observed in the specimens that were imaged during the current-voltage experiments ( Figures 10(a) and 11). This suggests that the observed blister formation is due to delamination around TiO 2 nanoparticles at the interfaces.…”

Section: E Stress Distributions and Crack Driving Forcesmentioning

confidence: 83%

Adhesion and degradation of organic and hybrid organic-inorganic light-emitting devices

Momodu

Tong

Kana

et al. 2014

Journal of Applied Physics

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This paper presents the results of a combined analytical, computational, and experimental study of adhesion and degradation of Organic Light Emitting Devices (OLEDs). The adhesion between layers that are relevant to OLEDs is studied using an atomic force microscopy technique. The interfacial failure mechanisms associated with blister formation in OLEDs and those due to the addition of TiO2 nanoparticles into the active regions are then elucidated using a combination of fracture mechanics, finite element modeling and experiments. The blisters observed in the models are shown to be consistent with the results from adhesion, interfacial fracture mechanics models, and prior reports of diffusion-assisted phenomena. The implications of the work are then discussed for the design of OLED structures with improved lifetimes and robustness.

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Section: E Stress Distributions and Crack Driving Forcesmentioning

confidence: 83%

Adhesion and degradation of organic and hybrid organic-inorganic light-emitting devices

Momodu

Tong

Kana

et al. 2014

Journal of Applied Physics

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“…The sides of the specimens were coated with gold to enhance their conductivities and enable imaging in the SEM. The key features of the crack patterns were thus observed and measured, prior to incorporation into expressions for the estimation of crack-tip shielding levels from row and zone models (Tong et al, 2012).…”

Section: Interfacial Fracture Testingmentioning

confidence: 99%

“…Prior work on interfacial fracture between bi-material interfaces has explored ceramic/epoxy interfaces (Rahbar, Wolf et al, 2008) for applications in dentistry and medicine (Tong et al, 2012), (Rahbar, Yang et al, 2008), and electronics packaging (Tong et al, 2012). These have shown that the crack paths depend strongly on the ratio of the interfacial fracture toughness, to the interfacial energy release rate to the substrate fracture toughness, the substrate energy release rate (G s ) and the mode mixity/phase angle, ψ.…”

Section: Introductionmentioning

confidence: 99%

“…Rahbar et al (Rahbar, Wolf et al, 2008) have shown that the crack path selection criteria depend on crack interactions with ceramic particles that are present in epoxy composites often used as coatings. Rahbar et al (Rahbar, Wolf et al, 2008) and Tong et al (Tong et al, 2012) have also shown that cracks can kink in and out of interfaces, depending on the nature of the interactions between the crack-tip plastic zones and deformation fields around the nanoparticles. These results in deflected crack profiles that leave behind regions of crack bridging ligaments and distributed micro cracks.…”

Section: Introductionmentioning

confidence: 99%

“…These results in deflected crack profiles that leave behind regions of crack bridging ligaments and distributed micro cracks. The shielding contributions from the cracking configurations have been estimated by Rahbar et al (Rahbar, Wolf et al, 2008) and Tong et al (Tong et al, 2012) using zone and row models developed by Hutchinson et al (Hutchinson, 1992). The zone and row models have also been used to explain the mode mixity dependence of the interfacial fracture toughness of organic electronic structures and ceramic/epoxy composite interfaces that are used in dentistry.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Properties of Epoxy/Clay Composite Coatings on an X65 Steel Substrate

et al. 2021

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This paper presents the results of a combined experimental and theoretical study of the interfacial and mechanical properties of epoxy/clay composites coatings on a mild steel substrate. This was studied using nano-indentation and Brazil Disk techniques to determine the Young's moduli, hardness values and mode mixity characteristics of the composite coatings. The Young's moduli of the reinforced composites comprising 1, 3, and 5 wt. % of montmorillonite clay particles are shown to improve, respectively, by about 23%, 58%, and 50% while the respective hardness values increased by about 46%, 80%, and 88%, relative to those of pristine epoxy. The measured mechanical properties have also shown to compare favorably with predictions from composite theories (rule-of-mixture and shear lag theories). The interfacial toughness between X65 steel and the epoxy/clay coatings increases with increasing mode mixity. This is associated with crack-tip shielding by crack deflection and crack bridging. The trends in the measured mode-mixity dependence of the interfacial fracture toughness values are consistent with predictions from the simplified zone, normal zone, and row models (at lower mode mixity). The insights from the observations and the measured crack profiles are incorporated into zone and row models for the estimation of crack-tip shielding. The implications of the ABOUT THE AUTHOR Ngasoh Fayen Odette obtained a Bachelor degree in Chemistry and Materials Science from the University of Buea, Cameroon in 2010. She also received her M.Sc in Materials Science and Engineering from the African University of Science and Technology (AUST) in Abuja, Nigeria in 2013. She is actively involved in the research and design of composites using promising materials locally source. She also extensively evaluates the adhesion of such coatings to substrates using fracture mechanic approach such as the interfacial fracture studies, for better understanding of their underlying properties. She is certain that findings from her work will benefit a wide range of research.

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Mechanical Robustness of Patterned Structures and Failure Mechanisms

Zschech¹,

Elizalde

2023

More-Than-Moore Devices and Integration for Semiconductors

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Mode Mixity Dependence of Interfacial Fracture Toughness in Organic Electronic Structures

Cited by 7 publications

References 23 publications

Adhesion and degradation of organic and hybrid organic-inorganic light-emitting devices

Adhesion and degradation of organic and hybrid organic-inorganic light-emitting devices

Mechanical Properties of Epoxy/Clay Composite Coatings on an X65 Steel Substrate

Mechanical Robustness of Patterned Structures and Failure Mechanisms

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