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1

Fiber shape selection problems in material models used in numerical strength analysis of wood-polymer composites

Frącz Wiesław, Janowski Grzegorz

Composites Theory and Practice

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2019

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R. 19, nr 2

50--55

EN

The paper presents the problems in selecting the fiber shape in numerical strength analysis for wood-polymer composites. For this purpose numerical analysis of the uniaxial tensile test for the wood-polymer composite sample was performed. Variable geometry of the fiber model was used. The fiber orientation data were obtained using Autodesk Moldflow Insight 2016 software. Micromechanical calculations based on homogenization methods were performed using Digimat FE commercial code. The results of the numerical simulations were compared with the experiment ones. To manufacture the WP composite, Moplen HP 648T polypropylene (PP) from Basell Orlen Polyolefins was used as the polymer matrix. As the filler 10 vol.% Lignocel C120 wood fiber manufactured by JRS - J. RETTENMAIER & Söhne Company was used. Adhesion promoter P613 by Dupont was used as well. A Dr Boy 55E injection molding machine was used to produce the test specimens. It was noted that the selection of the fiber shape has a significant impact on the consistency of the obtained results and consequently on compliance with the experiment ones. Fiber location calculations were performed for each geometry type available in the Digimat software. The most consistent results for numerical homogenization (Digimat FE) are associated with the choice of a curved cylinder shape of fiber. This may be due to the greatest convergence of the orientation tensor value received from the numerical simulation of the injection molding process during its transformations to the representative volume element model. In addition, this result may be due to the fact that the curved cylinder type of geometry is characterized by the most variable shape due to the degree of curvature. This reflects the real, non-standard problems to determine the shape of the wood fiber in the polymer matrix.

PL

Przedstawiono problematykę wyboru geometrii włókna w numerycznej analizie wytrzymałościowej kompozytu typu drewno-polimer. W tym celu przeprowadzono symulację próby jednoosiowego rozciągania dla próbek wykonanych z kompozytu polimerowo-drzewnego. Badano zmienną geometrię włókna, gdzie dane dotyczące orientacji włókien otrzymano z użyciem programu Autodesk Moldflow Insight 2016. Obliczenia mikromechaniczne opierające się na metodach homogenizacji przeprowadzono z użyciem programu Digimat FE. Wyniki otrzymane w symulacjach numerycznych porównano z eksperymentem. Stwierdzono, że dobór geometrii włókna w analizach numerycznych ma istotny wpływ na otrzymane wyniki, a w konsekwencji zgodność z eksperymentem.

2

The possibility of using wood fiber mats in products manufacturing made of polymer composites based on numerical simulations

Frącz W., Janowski G., Ryzińska G.

Applied Computer Science

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2017

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Vol. 13, no 4

65--75

EN

In this work the calculations for predicting the properties of wood fiber mats – polyester resin composite using numerical homogenization method were performed. For this purpose, the microstructural strength properties were calculated using DIGIMAT FE commercial code. In addition, for com-parative purposes a calculation of polyester resin – glass fiber composites was conducted. This allowed to compare the properties of two types of com-positions. In addition, the obtained strength properties were used to simulate the work of product made of these composites. This study was performed using the Ansys commercial code. Usability of the polyester resin – wood fiber mat composite and knowledge of its properties will allow to find a correct application of this composite type and can provide an alternative way to other polymeric resin reinforced by mat.

3

Influence of Homogenization Methods in Prediction of Strength Properties for WPC Composites

Frącz W., Janowski G.

Applied Computer Science

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2017

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Vol. 13, no 3

77--89

EN

In order to reduce costs of experimental research, new methods of forecasting material properties are being developed. The current intensive increase in computing power motivates to develop the computer simulations for material properties prediction. This is due to the possibility of using analytical and numerical methods of homogenization. In this work calculations for predicting the properties of WPC composites using analytical homogenization methods, i.e. Mori-Tanaka (first and second order) models, Nemat-Nasser and Hori models and numerical homogenization methods were performed.