The dependence of the viscoelastic properties of Polyamide 6 on temperature and moisture content: Experiment and modeling

Kießling, Robert; Ihlemann, Jörn

doi:10.1016/j.matpr.2020.02.751

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…67 In the context of a nonlinear material model at finite strains, the influence of temperature and moisture content on the viscoelastic material properties of PA 6 was investigated by Kießling and Ihlemann. 13 Since the influence of water plays an important role when dealing with polyamides, guidelines for sample preparation, 68 conditioning programs, 49,69,70 and experimental treatment were developed. 71…”

Section: Humidity Influence On Polyamidesmentioning

confidence: 99%

“…11,12 These differential models can be reformulated yielding the Boltzmann superposition integral where the kernel function is given by the so called Prony series. 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.…”

Section: Introductionmentioning

confidence: 99%

“…In the context of a nonlinear material model at finite strains, the influence of temperature and moisture content on the viscoelastic material properties of PA 6 was investigated by Kießling and Ihlemann. 13…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Section: Humidity Influence On Polyamidesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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show abstract

“…Additionally, the viscoelastic properties may be influenced by the fillers [5,6] or blending of different thermoplastics [7]. At low stress levels, the polymers are well-described by linear viscoelasticity, like generalized Maxwell models, which were applied to, e.g., polyamide [8] or polystyrene [9]. At higher stress levels, nonlinear viscoelastic effects become apparent in some materials, e.g., polypropylene [10].…”

Section: State Of the Artmentioning

confidence: 99%

Accounting for viscoelastic effects in a multiscale fatigue model for the degradation of the dynamic stiffness of short-fiber reinforced thermoplastics

et al. 2022

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Under fatigue loading, the stiffness decrease in short-fiber reinforced polymers reflects the gradual degradation of the material. Thus, both measuring and modeling this stiffness is critical to investigate and understand the entire fatigue process. Besides evolving damage, viscoelastic effects within the polymer influence the measured dynamic stiffness. In this paper, we study the influence of a linear viscoelastic material model for the matrix on the obtained dynamic stiffness and extend an elastic multiscale fatigue-damage model to viscoelasticity. Our contribution is two-fold. First, we revisit the complex-valued elastic models known in the literature to predict the asymptotic periodic orbit of a viscoelastic material. For small phase shifts in an isotropic linear viscoelastic material, we show through numerical experiments that a real-valued computation of an “elastic” material is sufficient to approximate the dynamic stiffness of a microstructure with a generalized Maxwell material and equal Poisson’s ratios in every element as matrix, reinforced by elastic inclusions. This makes standard solvers applicable to fiber-reinforced thermoplastics. Secondly, we propose a viscoelastic fatigue-damage model for the thermoplastic matrix based on decoupling of the time scales where viscoelastic and fatigue-damage effects manifest. We demonstrate the capability of the multiscale model to predict the dynamic stiffness evolution under fatigue loading of short-fiber reinforced polybutylene terephthalate (PBT) by a validation with experimental results.

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Hybridprofile für Trag- und Crashstrukturen

Drossel

Bobbert

Böhme

et al. 2021

Intrinsische Hybridverbunde Für Leichtbautragstrukturen

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The dependence of the viscoelastic properties of Polyamide 6 on temperature and moisture content: Experiment and modeling

Cited by 4 publications

References 5 publications

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

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

Accounting for viscoelastic effects in a multiscale fatigue model for the degradation of the dynamic stiffness of short-fiber reinforced thermoplastics

Hybridprofile für Trag- und Crashstrukturen

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