Characterizing and modeling the non-linear viscoelastic tensile deformation of a glass fiber reinforced polypropylene

Fritsch, Jens; Hiermaier, Stefan; Strobl, G.

doi:10.1016/j.compscitech.2009.06.021

Cited by 12 publications

(10 citation statements)

References 29 publications

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“…A similar approach can be found in other literature [5,11,12]. This definition of damage has been included in the newly-developed material model SAMP-1 [8], denoted as Ã MAT_SAMP-1 or Ã MAT_187 in LS-DYNA [13].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is important to accurately characterize the mechanical behavior of the related materials. Although some previous studies have been carried out on characterization of thermoplastics [1][2][3][4][5][6][7][8][9], there are still some open questions requiring further research, such as those regarding strain-induced damage behavior.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on characterizing damage behavior of thermoplastics

Xia

Lin

et al. 2013

Materials & Design

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental study on characterizing damage behavior of thermoplastics

Xia

Lin

et al. 2013

Materials & Design

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“…Firstly, many models used for the analysis of the mechanical test results require assumptions that are practically unrealistic. For example, characteristic relaxation time for the viscous deformation has often been assumed to be constant, independent of the deformation level or of the material [ 16 , 17 , 18 ]. Secondly, modeling based on spring and dashpot elements often assumed that the viscous stress component is a function of total strain rate, rather than the strain rate across the dashpot element [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…For example, characteristic relaxation time for the viscous deformation has often been assumed to be constant, independent of the deformation level or of the material [ 16 , 17 , 18 ]. Secondly, modeling based on spring and dashpot elements often assumed that the viscous stress component is a function of total strain rate, rather than the strain rate across the dashpot element [ 16 ]. Maxwell and Voigt-Kelvin models are the basic models that use spring and dashpot to simulate the viscous deformation [ 19 , 20 ], with the assumption of a linear relationship between viscous stress and strain rate across the dashpot.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Polyethylene Using a New Test Method Based on Stress Response to Relaxation and Recovery

Shi

Jar

2022

Polymers

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A novel multi-relaxation-recovery (RR) test was proposed based on cyclic stages of stress relaxation and stress recovery. Three nonlinear visco-elastic models, that is, the standard model and two models with two dashpots connected either in parallel or in series, were examined for the analysis of the test results. Each model contains a time-dependent, viscous branch and a time-independent, quasi-static branch. The examination suggests that the standard model can determine the long-term, load-carrying performance of polyethylene (PE) and identify a transition point for the onset of plastic deformation in the crystalline phase, but the models with two dashpots connected either in parallel or in series are needed to provide a close simulation of the experimentally measured stress response in both relaxation and recovery stages of the RR test. In this work, the mechanical performance of two PEs was compared based on RR test results at room temperature. The RR tests were also conducted at elevated temperatures to explore the possibility of quantifying the activation energies for deformation of the dashpots at the relaxation stage. It was found the RR test has the advantage of separating the time-dependent and time-independent components of stiffness of the materials. The study concludes that the RR test can provide data for determining parameters in Eyring’s model in order to characterize the contribution of time-dependent and time-independent components of the stress response to PE’s deformation.

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“…This model, when compared with the experimental data, presented a similar behavior up to the first 1,000 h. Argyris et al (1991) and Argyris et al (1992) developed an appropriate numerical model using rheological models of Maxwell and Kelvin-Voigt for the analysis of membrane structures in PVC-coated fabric. Fritsch et al (2009) developed a novel rheological material model that features a decomposition of the stress into a time independent quasi-static component and a time and strain dependent viscous component, correctly reproducing the quasi-static and dynamic stress-strain behavior of the fiber-reinforced polypropylene. Kaliske (2000) introduced an anisotropic constitutive formulation discretized into finite elements, using the generalized Maxwell model for application to transversely isotropic materials, performing static and dynamic analyses of U and laminates profiles, and extending the application for mechanical biology.…”

Section: Introductionmentioning

confidence: 99%

Modeling the creep behavior of GRFP truss structures with Positional Finite Element Method

Rabelo

Becho

Greco

et al. 2018

Lat. Am. j. solids struct.

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This paper presents the development of a formulation, based on Positional Finite Element Method, to describe the viscoelastic mechanical behavior of space trusses. The numerical method used was chosen due to its efficiency in the applications concerning nonlinear numerical analyses. The formulation describes the positional variation over time under constant stress state (creep). The objective is to provide a way to quantify the creep behavior for space truss structures and thus contribute to the encouragement of GFRP usage in such structural components. Time-dependent behavior of such materials is one the most important factors for their use in design of structures, demanding studies about the deformations expected within the operational life of the structural systems. To perform this study, the proposed methodology considers a standard solid rheological model to describe stress-strain time-dependent law. This model is implemented in the formulation for quantify the total strain energy. The effects of the model parameters in the mechanical response of the structure with accentuated geometric nonlinearity were presented. In this analysis, it was possible to identify the influence of the elastic and the viscous moduli on the creep response. Model calibration was performed using test data obtained from literature and a GFRP transmission line tower cross-arm was simulated to predict the evolution of displacements under real operational loads. From the results, it was possible to observe a fast evolution of displacements due to the creep effect in the first 7,500 h. This increase was close to 0.6% in relation to the displacement obtained in the elastic behavior. The presented methodology provided a simple and efficient way to quantify the creep phenomenon in viscoelastic GFRP composites truss structures, as can be seen in the developed analyses.

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Characterizing and modeling the non-linear viscoelastic tensile deformation of a glass fiber reinforced polypropylene

Cited by 12 publications

References 29 publications

Experimental study on characterizing damage behavior of thermoplastics

Experimental study on characterizing damage behavior of thermoplastics

Characterization of Polyethylene Using a New Test Method Based on Stress Response to Relaxation and Recovery

Modeling the creep behavior of GRFP truss structures with Positional Finite Element Method

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