Assessment of the Thermoelastic Properties of an Injection molded short-fiber Composite: Experimental and Modelling

Régnier, Gilles; Dray, D.; Pierre, Guillaume

doi:10.1007/s12289-008-0293-8

Cited by 2 publications

(2 citation statements)

References 14 publications

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“…In a second step, an orientation averaging procedure is applied. Good results are achievable with the so-called Orthotropic Fitted Closure (OFC) approximation [21] as shown by R é gnier et al [20] . The mean overall composite stiffness matrix follows by:…”

Section: Sub-domainmentioning

confidence: 96%

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Micromechanical modeling and strength prediction of short fiber reinforced polymers

Kaiser

Stommel

2012

Journal of Polymer Engineering

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In this contribution, the embedding and compatibility of commonly used strength criteria in practical engineering design (e.g., Tsai-Hill) into a two-step, mean-fi eld, homogenization approach are investigated. This approach provides the opportunity to account for the heterogeneous microstructure of a polymer composite, caused by the non-unidirectional fi ber distribution due to the injection molding process. In a fi rst step, an incremental Mori-Tanaka homogenization scheme is applied to unidirectional sub-domains. In a second step, a Voigt model is used to compute the mechanical composite behavior of an entire domain, which itself is the composition of weighted sub-domains. The chosen two-step approach allows the application of models to predict the strength after both homogenization steps. This leads to two different strength prediction strategies. The selection of certain criteria in combination with the selected level of strength prediction infl uences the simulation results and the number of material tests necessary for calibration. These two aspects are directly linked to engineering expenses and they are evaluated in a cost benefi t analysis. To account for elasto-plasticity, a second-moment formulation is used and extended. The extension allows the direct usage of experimental matrix material data, without having to introduce a virtual matrix as commonly necessary.

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Section: Sub-domainmentioning

confidence: 96%

“…Therefore only an orientation averaging procedure must be applied. Authors like R é gnier et al [20] recommend two steps to predict the overall mechanical properties of such a composite. In the fi rst step, the stiffness tensor for the unidirectional composite is calculated, see Eq.…”

Section: Sub-domainmentioning

confidence: 99%

Micromechanical modeling and strength prediction of short fiber reinforced polymers

Kaiser

Stommel

2012

Journal of Polymer Engineering

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A model to describe the cyclic anisotropic mechanical behavior of short fiber-reinforced thermoplastics

Navrátil

Leveuf

Saux

et al. 2020

Mech Time-Depend Mater

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Due to the injection molding process, short fiber-reinforced thermoplastic composites show a complex fiber orientation distribution and, as a consequence, an overall anisotropic mechanical behavior. The monotonic and cyclic mechanical behavior of PolyEtherEtherKetone thermoplastic reinforced with 30wt.% of short carbon fibers was characterized through a series of tests generating various complex loading histories performed at room temperature on samples with various homogeneous and heterogeneous fiber orientation distributions. A three-dimensional model relying on a thermodynamic framework was then developed to represent the anisotropic mechanical behavior of the material, including elastic, viscoelastic and plastic phenomena. The model was implemented into a finite element code to be able to simulate the response of complex parts with a heterogeneous fiber orientation distribution subjected to a heterogeneous loading. Model parameters were identified by applying a robust and original approach relying on a limited number of relevant experiments. The prediction capability of the model was demonstrated by simulating several types of tests not used for the identification, covering a wide range of monotonic and cyclic, homogeneous and heterogeneous, loading conditions, for various simple and complex fiber orientation distributions. In particular, the model is shown to be able to predict the energy dissipated in the material when subjected to cyclic loading.

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Assessment of the Thermoelastic Properties of an Injection molded short-fiber Composite: Experimental and Modelling

Cited by 2 publications

References 14 publications

Micromechanical modeling and strength prediction of short fiber reinforced polymers

Micromechanical modeling and strength prediction of short fiber reinforced polymers

A model to describe the cyclic anisotropic mechanical behavior of short fiber-reinforced thermoplastics

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