A multi-physics constitutive model to predict hydrolytic aging in quasi-static behaviour of thin cross-linked polymers

Bahrololoumi, Amir; Morovati, Vahid; Poshtan, Emad A.; Dargazany, Roozbeh

doi:10.1016/j.ijplas.2020.102676

Cited by 46 publications

(13 citation statements)

References 58 publications

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“…This may be because the additives primarily comprise compounds with stable chemical properties, such as zinc oxide, carbonates, and silicates, etc., which are less easily to react with oxygen or other media under TO conditions compared to those more active unsaturated groups in molecular chain network of VEMs such as hydrogen bonds and other free radicals. 18,37 To consider this heterogeneity, a strain amplification function is employed, and a non-affine directional model by considering the non-uniformity of deformation distribution is proposed, 29 which is…”

Section: Mathematical Model Of Thermaloxidative Aging Vemsmentioning

confidence: 99%

“…Besides, one can observe from Figure 15b,d,e that the stress level of VEMs does not vary with the increase in P f , m e , and m f . This may be because that the probability of forming a new crosslinking point on a single chain is less than 1, whereas the average number of forming a new crosslinking point on a single elastic chain or free chain is relatively large (much more than 1) since that the SOC reaction are often predominant during the TO aging, 15,18,29,50 which leads to the corresponding strain energy components including Φ e11 , Φ e12 , and Φ f12 are insensitive to the variations of P f , m e and m f , which finally explain phenomenon presented in Figure 15b,d,e.…”

Section: Sensitivity Analysis Of Model Parametersmentioning

confidence: 99%

“…To consider this heterogeneity, a strain amplification function is employed, and a non‐affine directional model by considering the non‐uniformity of deformation distribution is proposed, 29 which is

λ^{q_{j}} = \frac{χ^{q_{j}} - μ^{ν}}{1 - μ^{ν}}

where

λ^{q_{j}} = {((), q_{i} F^{T} boldF q_{i})}^{1 / 2}

and

χ^{q_{j}}

are the microscopic tensile ratio and the macroscopic tensile ratio in direction

q_{j}

, in which

F

is the deformation gradient,

μ

is the volume fraction of filler in the range of 0–0.3,

ν

depends on the matrix network, and is taken as 1/3 in this paper 47 …”

Section: Mechanical Property Characterization Of Thermal‐oxidative Ag...mentioning

confidence: 99%

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Mechanical properties of viscoelastic materials subjected to thermal‐oxidative aging: An experimental and theoretical study

Li,

Xu,

Tong

et al. 2023

J of Applied Polymer Sci

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Viscoelastic materials (VEMs) made from rubber polymer will inevitably age due to the interactions with the harmful environment during service life, thus reducing the reliability of viscoelastic (VE) damping equipment installed in building structures. In order to understand and be able to predict the degradation of VE damping equipment, it is imperative to comprehensively study the influence of aging on the mechanical properties of VEMs. In this paper, a series of thermal‐oxidative (TO) aging tests and mechanical property tests are conducted on our previously developed VEMs to study effects of TO aging on the molecular chain structure and corresponding changes of macroscopic mechanical properties of VEMs. By classifying molecular chains of VEMS into elastic chains and free chains, the effects of different chemical reactions during TO aging on these two main chains and corresponding changes on macroscopic mechanical behaviors of VEMs are analyzed. This facilitates formulating a mathematical model that can characterize the mechanical behavior of TO aging VEMs. In conjunction with the experimental data, the accuracy and applicability of the proposed model are compared and verified. Sensitivity analyses of parameters involved in the proposed model are then performed. The experimental results demonstrate that the TO aging can degrade the deformation capability and harden the modulus of VEMs, which may adversely affect the performance of VE damping devices. The parameter analyses depict that the TO aging affects the macroscopic mechanical behavior of VEMs by altering the relative number and configuration of free chains and elastic chains as well as their respective contributions to the total stress of VEMs. The results point to the high accuracy of the proposed model in representing the strain–stress behavior of VEMs under different aging conditions.

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Section: Mathematical Model Of Thermaloxidative Aging Vemsmentioning

confidence: 99%

Section: Sensitivity Analysis Of Model Parametersmentioning

confidence: 99%

λ^{q_{j}} = \frac{χ^{q_{j}} - μ^{ν}}{1 - μ^{ν}}

where

λ^{q_{j}} = {((), q_{i} F^{T} boldF q_{i})}^{1 / 2}

and

χ^{q_{j}}

are the microscopic tensile ratio and the macroscopic tensile ratio in direction

q_{j}

, in which

F

is the deformation gradient,

μ

is the volume fraction of filler in the range of 0–0.3,

ν

depends on the matrix network, and is taken as 1/3 in this paper 47 …”

Section: Mechanical Property Characterization Of Thermal‐oxidative Ag...mentioning

confidence: 99%

See 1 more Smart Citation

Mechanical properties of viscoelastic materials subjected to thermal‐oxidative aging: An experimental and theoretical study

Li,

Xu,

Tong

et al. 2023

J of Applied Polymer Sci

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show abstract

“…[ 9,19–28 ] As a host for nanocrystals, PDMS offers easy fabrication, tunable mechanical behavior, biocompatibility, high translucency in ultraviolet (UV) through near‐infrared (NIR) spectral range, and unlike many other cross‐linked materials it has stable mechanical properties over time. [ 29–33 ] Recently, SiNCs embedded in polymers such as polymethyl(methacrylate) (PMMA) and PDMS have been proposed as agents for LSCs, solar cells, UV‐blocking layers, and more due to the NCs’ absorbance in the UV–blue spectral range and efficient emission at red NIR wavelengths. Although SiNCs in PDMS have not been extensively considered, nanocomposites comprised of PDMS and other inorganic inclusions point toward a varied mechanical response depending on the nature of the interaction between the inclusion and the polymer.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Optical Properties of Stretchable Silicon Nanocrystal/Polydimethylsiloxane Nanocomposites

Izadi

Toback

Sinha

et al. 2020

Physica Status Solidi (a)

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Nanoparticle‐infused polymer composites have long been an area of interest due to the typically stabilizing effects they have on the mechanical behavior of the composites, as well as added functionalities such as reduced surface resistance. Newer applications of these nanocomposites include dispersing optoelectronically functional nanoparticles in polymer matrices, for example, including luminescent nanocrystals in rigid slabs for luminescent solar concentrating photovoltaics and electrochromic panels. Dispersion of luminescent nanocrystals in stretchable polymers adds novel possibilities for applications, such as wearable health monitoring systems, flexible communications devices, and more. To leverage the exciting combined properties that these nanocomposites promise, there is a pressing need to evaluate and understand the interconnections between the optical effects, mechanical behavior, and the properties of the constituents. Herein, the optical and mechanical behavior of brightly emissive silicon nanocrystal/polydimethylsiloxane (PDMS) nanocomposites are investigated as a function of nanocrystal concentration and nanocrystal surface functionality. Mechanically, incorporating the nanocrystals at higher concentration leads to a dramatic reduction in the mechanical properties of the nanocomposite. The results suggest that the nanocrystal inclusions interfere with polymer cross‐linking, changing the mechanical behavior of the host PDMS as compared to the control.

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“…These include layer thickness, surface functionality, and the mechanical properties of the PDMS substrate as a cross-linked material. [18][19][20][21] In order to reveal some of these interrelationships, we investigated a set of parameters regarding their inuence over the mechanical properties of SiNC layers on PDMS, as evaluated using the same nite bending method. Our results indicate that the layer of SiNCs and PDMS parameters exert competing inuences on the mechanical properties of the SiNC layers.…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior of SiNC layers on PDMS: effects of layer thickness, PDMS modulus, and SiNC surface functionality

et al. 2020

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show abstract

A multi-physics constitutive model to predict hydrolytic aging in quasi-static behaviour of thin cross-linked polymers

Cited by 46 publications

References 58 publications

Mechanical properties of viscoelastic materials subjected to thermal‐oxidative aging: An experimental and theoretical study

Mechanical properties of viscoelastic materials subjected to thermal‐oxidative aging: An experimental and theoretical study

Mechanical and Optical Properties of Stretchable Silicon Nanocrystal/Polydimethylsiloxane Nanocomposites

Mechanical behavior of SiNC layers on PDMS: effects of layer thickness, PDMS modulus, and SiNC surface functionality

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