Formulation of non-linear viscoelastic–viscoplastic constitutive equation for polyamide 6 resin

Koyanagi, Jun; Hasegawa, Kodai; Ohtani, Akio; Sakai, Takenobu; Sakaue, Kenichi

doi:10.1016/j.heliyon.2021.e06335

Cited by 9 publications

(4 citation statements)

References 43 publications

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“…As described in a previous paper [41], PA6 resin (CM1006, Toray Industries, Inc., Tokyo, Japan) was used for the experiments. Tensile tests were conducted using a universal mechanical testing machine (AG-X plus, Shimadzu Co., Ltd., Kyoto, Japan, shown in Figure 4) at room temperature, with a crosshead speed of 1 mm/min to confirm the results of the MD simulations.…”

Section: Materials and Methodology Of The Tensile Testmentioning

confidence: 99%

A Possibility for Quantitative Detection of Mechanically-Induced Invisible Damage by Thermal Property Measurement via Entropy Generation for a Polymer Material

et al. 2022

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Entropy generation from a mechanical and thermal perspective are quantitatively compared via molecular dynamic (MD) simulations and mechanical and thermal experiments. The entropy generation values regarding mechanical tensile loading—which causes invisible damage—of the Polyamide 6 (PA6) material are discussed in this study. The entropy values measured mechanically and thermally in the MD simulation were similar. To verify this consistency, mechanical and thermal experiments for measuring entropy generation were conducted. The experimentally obtained mechanical entropy was slightly less than that calculated by MD simulation. The thermal capacity is estimated based on the specific heat capacity measured by differential scanning calorimetry (DSC), applying the assumed extrapolation methods. The estimated entropy generation was higher than the aforementioned values. There is a possibility that the entropy-estimating method used in this study was inappropriate, resulting in overestimations. In any case, it is verified that entropy increases with mechanical loading and material invisible damage can be qualitatively detected via thermal property measurements.

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Section: Materials and Methodology Of The Tensile Testmentioning

confidence: 99%

A Possibility for Quantitative Detection of Mechanically-Induced Invisible Damage by Thermal Property Measurement via Entropy Generation for a Polymer Material

et al. 2022

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“…The TTS principle is one of the most useful extrapolation techniques, with a large number of applications, in polymer technology. In fact, it has been applied in a very wide range of linear, amorphous or semicrystalline polymers [24] , [25] , [26] , [27] , [28] . This principle, proposed by Leaderman [29] , states that for thermo-rheologically simple viscoelastic materials (polymers), time and temperature are related according to a Time Temperature Superposition, which implies that the effects of time and temperature on mechanical properties (such as modulus) of polymers are generally equivalent [30] .…”

Section: Time Temperature Superposition Principle and Master Curvementioning

confidence: 99%

TTS package: Computational tools for the application of the Time Temperature Superposition principle

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Francisco‐Fernández

et al. 2023

Heliyon

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“…Kießling and Ihlemann 13 used the GMM to model the viscoelastic behavior of PA 6 in the context of large deformations. Koyanagi et al 14 developed a viscoelastic-viscoplastic material model for PA 6 where a GMM was considered for the viscoelastic part. Under special assumptions, a differential formulation of the nonlinear Schapery model exists.…”

Section: Introductionmentioning

confidence: 99%

Dynamic mechanical analysis of PA 6 under hydrothermal influences and viscoelastic material modeling

Kehrer

Keursten

Hirschberg

et al. 2023

Journal of Thermoplastic Composite Materials

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Polyamides serve as matrix material for fiber reinforced composites and are widely applied in many different engineering applications. In this context, they are exposed to various environmental influences ranging from temperature to humidity. Thus, the influence of these environmental conditions on the mechanical behavior and the associated implications on the performance of the material is of utmost importance. In this work, the thermoviscoelastic behavior of polyamide 6 (PA 6) for two equilibrium moisture contents is investigated. To this end, dynamic mechanical analysis tests with and without humidity control of the environmental chamber were performed. In terms of relaxation tests, the experimental results reveal drying effects and increased diffusion activities when the sample’s equilibrium moisture content differs from the ambient humidity level within the testing chamber. Temperature-frequency tests quantify the humidity-induced shift of the glass transition temperature. The linear generalized Maxwell model (GMM) and time-temperature superposition are used to analyze the hydrothermal effects on the linear viscoelastic material properties and the onset of mechanical nonlinearity. Based on these investigations and findings, insight is gained on the humidity influence on the material properties and the limitations of linear thermoviscoelastic modeling. Furthermore, the computational construction of master curves and the parameter identification for a generalized Maxwell model are described in detail.

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Formulation of non-linear viscoelastic–viscoplastic constitutive equation for polyamide 6 resin

Cited by 9 publications

References 43 publications

A Possibility for Quantitative Detection of Mechanically-Induced Invisible Damage by Thermal Property Measurement via Entropy Generation for a Polymer Material

A Possibility for Quantitative Detection of Mechanically-Induced Invisible Damage by Thermal Property Measurement via Entropy Generation for a Polymer Material

TTS package: Computational tools for the application of the Time Temperature Superposition principle

Dynamic mechanical analysis of PA 6 under hydrothermal influences and viscoelastic material modeling

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