69‐3: Non‐Linear Mechanics of Adhesives for Robust Flexible Displays

Abrahamson, Joel T.; Yeh, C. Joshua; Hedegaard, Aaron T.; McDaniel, David J.

doi:10.1002/sdtp.14868

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…Flexible organic light-emitting diode (OLED) displays incorporate a complex layering of components, such as the cover window, circular polarizer, touch sensor, OLED panel, and flexible substrate, which are cohesively bonded using pressure-sensitive adhesives (PSAs). These adhesives are integral to the structural integrity and functionality of OLED displays [1][2][3] . PSAs are characterized by their ability to adhere rapidly to a variety of surfaces, a property that is crucial in connecting components in a display.…”

Section: Effect Of Temperature and Humidity On Mechanical Properties ...mentioning

confidence: 99%

Effect of temperature and humidity on mechanical properties and constitutive modeling of pressure-sensitive adhesives

Luo,

Chen,

Liu

et al. 2024

Sci Rep

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Pressure-sensitive adhesives (PSAs) are crucial for the structural and functional integrity of flexible displays. Investigating the intricate mechanical properties of PSAs can help enhance product quality and performance. This study conducts systematic mechanical tests, including uniaxial tensile, compression, planar shear, and stress relaxation, on PSAs at temperatures ranging from – 25 to 85 ℃ and relative humidity levels from 0 to 90%. Our findings reveal that the Anssari-Benam model accurately describes the hyperelastic behavior of PSA materials under large deformation, outperforming the Ogden model by requiring fewer parameters and better preserving convexity. Moreover the results show that temperature markedly affects PSA properties, particularly near the glass transition temperature (Tg), with lower temperatures leading to decreased elasticity and higher temperatures aiding in stress relaxation. Similarly, humidity impacts PSA behavior, increasing elasticity and decreasing stiffness, especially noticeable in stress relaxation tests. These findings highlight the substantial influence of environmental conditions on the material properties of PSAs and underscore the necessity of understanding both hyperelastic and viscoelastic responses for their application in flexible technologies. This research provides critical insights for the optimal utilization of PSAs in the rapidly evolving field of flexible electronics, including OLED displays.

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Section: Effect Of Temperature and Humidity On Mechanical Properties ...mentioning

confidence: 99%

Effect of temperature and humidity on mechanical properties and constitutive modeling of pressure-sensitive adhesives

Luo,

Chen,

Liu

et al. 2024

Sci Rep

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Temperature and Humidity on Mechanical Properties and Constitutive Modeling of Pressure- Sensitive Adhesives

Luo,

Chen,

Liu

et al. 2024

Preprint

View full text Add to dashboard Cite

Pressure-sensitive adhesives (PSAs) are crucial for the structural and functional integrity of flexible devices. This study conducts systematic mechanical tests, including uniaxial tensile, compression, planar shear, and stress relaxation, on PSAs at temperatures ranging from − 25℃ to 85℃ and relative humidity levels from 0–90%. The Ogden model effectively describes the hyperelastic behavior of PSAs under large deformations, as indicated by an R-Square value above 0.97. The results show that temperature markedly affects PSA properties, particularly near the glass transition temperature (Tg), with lower temperatures leading to decreased elasticity and higher temperatures aiding in stress relaxation. Similarly, humidity impacts PSA behavior, increasing elasticity and decreasing stiffness, especially noticeable in stress relaxation tests. These findings highlight the substantial influence of environmental conditions on the material properties of PSAs and underscore the necessity of understanding both hyperelastic and viscoelastic responses for their application in flexible technologies. This research provides critical insights for the optimal utilization of PSAs in the rapidly evolving field of flexible electronics, including OLED displays.

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Experimental study on the constitutive model of optically clear adhesive films under rapid loading

Huo

et al. 2022

J of Applied Polymer Sci

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The mechanical properties of optically clear adhesive (OCA) films can be anisotropy and viscoelasticity, and they are distinguished from conventional linear elasticity and hyper-elasticity. These properties should be considered to analyze the interfacial stress, which plays an important role in evaluating the failure of a structure containing OCA. Based on well-designed systematical experiments in the material's principal axes, a phenomenological constitutive model of OCA has been proposed in a transversely isotropic and ratedependent form. For the application to large deformation cases, the constitutive model was developed by using true stress and true strain. Results show that the well-known assumption of volume-incompressibility is not appropriate for OCA, and Poisson's ratio can vary with the loading rate and the current strain. Considering that the mono-axial mechanical behaviors along the material's principal axes present strong non-linearity, an incremental threedimensional constitutive model has been developed for finite element method (FEM) implementation. By comparing with traditional isotropic elastic and hyperelastic models, numerical examination results show that the proposed constitutive model can give a more accurate description of experimental stress-strain curves.

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69‐3: Non‐Linear Mechanics of Adhesives for Robust Flexible Displays

Cited by 3 publications

References 8 publications

Effect of temperature and humidity on mechanical properties and constitutive modeling of pressure-sensitive adhesives

Effect of temperature and humidity on mechanical properties and constitutive modeling of pressure-sensitive adhesives

Effect of Temperature and Humidity on Mechanical Properties and Constitutive Modeling of Pressure- Sensitive Adhesives

Experimental study on the constitutive model of optically clear adhesive films under rapid loading

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