Investigations into the damage mechanisms of glass fiber reinforced polypropylene based on micro specimens and precise models of their microstructure

Fliegener, Sascha; Kennerknecht, Tobias; Kabel, Matthias

doi:10.1016/j.compositesb.2016.12.051

Cited by 21 publications

(24 citation statements)

References 27 publications

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“…From a physical point of view, the toughening effect of heterogeneous media predicted by Hossain et al may be observed experimentally if η is small, but not exceedingly so, that is, for microtensile experiments if the length scale of the heterogeneities is small. In contrast, for purely macroscopic loading conditions, the homogenization theory of Braides et al and Cagnetti et al is more appropriate.…”

Section: Homogenization Of Brittle Fracture and Cell Formulaementioning

confidence: 93%

“…In particular, upon η→0, the homogenized functional is recovered, together with the corresponding cell formulae. Put differently, γ eff arises from a suitable averaging procedure of

J_{η}^{eff}

as η→0.From a physical point of view, the toughening effect of heterogeneous media predicted by Hossain et al may be observed experimentally if η is small, but not exceedingly so, that is, for microtensile experiments if the length scale of the heterogeneities is small. In contrast, for purely macroscopic loading conditions, the homogenization theory of Braides et al and Cagnetti et al is more appropriate.…”

Section: Homogenization Of Brittle Fracture and Cell Formulaementioning

confidence: 99%

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An FFT‐based method for computing weighted minimal surfaces in microstructures with applications to the computational homogenization of brittle fracture

Schneider

2019

Numerical Meth Engineering

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Summary Cell formulae for the effective crack resistance of a heterogeneous medium obeying Francfort‐Marigo's formulation of linear elastic fracture mechanics have been proved recently, both in the context of periodic and stochastic homogenization. This work proposes a numerical strategy for computing the effective, possibly anisotropic, crack resistance of voxelized microstructures using the fast Fourier transform (FFT). Based on Strang's continuous minimum cut—maximum flow duality, we explore a primal‐dual hybrid gradient method for computing the effective crack resistance, which may be readily integrated into an existing FFT‐based code for homogenizing thermal conductivity. We close with demonstrative numerical experiments.

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Section: Homogenization Of Brittle Fracture and Cell Formulaementioning

confidence: 93%

“…In particular, upon η→0, the homogenized functional is recovered, together with the corresponding cell formulae. Put differently, γ eff arises from a suitable averaging procedure of

J_{η}^{eff}

Section: Homogenization Of Brittle Fracture and Cell Formulaementioning

confidence: 99%

An FFT‐based method for computing weighted minimal surfaces in microstructures with applications to the computational homogenization of brittle fracture

Schneider

2019

Numerical Meth Engineering

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“…1 mm thin slices of material are ground, polished and the form of the specimen is CNC-milled out of the material slice as described in detail in [1]. The strain is determined from the surface pictures via a virtual clip gauge as described in [2]. Fig.…”

Section: Methodsmentioning

confidence: 99%

Characterization of fiber matrix interface of continuous‐discontinuous fiber reinforced polymers on the microscale

Rohrmüller

Schober

Dittmann

et al. 2019

Proc Appl Math and Mech

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In lightweight constructions fiber reinforced polymers are an important material group. They combine low density with high strength and stiffness. The characterization of fiber reinforced polymers includes the characterization of the fibers, the matrix and the intermediate interface. The fibers and the matrix can be characterized on the neat materials. Single fiber tests are typically used to characterize the interface. However, the interaction between different fibers inside a composite is not taken into account in a single fiber test. The investigated sheet molding compound (SMC) has a bundle arrangement of the fibers, where the contact of different fibers is very close and therefore also the fiber-fiber interaction has a high influence. Here we investigate the micromechanical behavior of hourglass shaped micro specimens with several hundreds of fibers with quasistatic tensile tests. For the interface characterization the microstructure of the specimens is rebuilt in a simulation. The glass fibers are modeled as linear elastic, the matrix as hyperelastic and the interface by means of a cohesive zone model.

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“…as a function of the material constants E (q) , ν and τ (q) = η (q) /E (q) . The linear viscoelastic model (1) to (3) is extended to cover nonlinear viscoelasticity in the Schapery sense by assuming E (q) to be stress dependent functions instead of constant generalized Young's moduli [2]. The isotropic base model is extended to anisotropy in two different ways.…”

Section: Formulationmentioning

confidence: 99%

“…The models are implemented as user-defined subroutines into a commercial finite element program. Full details will be given in an oncoming publication [1]. As an example, the experimentally determined creep curves for the UD material, tested at ambient temperature perpendicular to the fiber direction are presented in Fig.…”

Section: Formulationmentioning

confidence: 99%

An anisotropic creep model for continuously and discontinuously fiber reinforced materials

Hohe

Fliegener

2019

Proc Appl Math and Mech

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The present study is concerned with the formulation, implementation and validation of anisotropic creep laws for neat thermoplastic matrix materials, discontinuously long fiber reinforced thermoplastic (LFT) composite materials with process dependent fiber preference directions as well as unidirectionally fiber reinforced thermoplastic tapes. Based on a simple three term Kelvin-Voigt approach, an anisotropic model is formulated and implemented into a finite element program. The model is validated against an experimental data base of creep experiments on continuously and discontinuously fiber reinforced materials.

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Investigations into the damage mechanisms of glass fiber reinforced polypropylene based on micro specimens and precise models of their microstructure

Cited by 21 publications

References 27 publications

An FFT‐based method for computing weighted minimal surfaces in microstructures with applications to the computational homogenization of brittle fracture

An FFT‐based method for computing weighted minimal surfaces in microstructures with applications to the computational homogenization of brittle fracture

Characterization of fiber matrix interface of continuous‐discontinuous fiber reinforced polymers on the microscale

An anisotropic creep model for continuously and discontinuously fiber reinforced materials

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