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

• Autorzy: Frącz Wiesław , Janowski Grzegorz

Warianty tytułu

PL

Problematyka wyboru geometrii włókien w modelach materiałowych stosowanych w numerycznych analizach wytrzymałościowych kompozytów typu drewno-polimer

• Języki publikacji: EN

Abstrakty

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.

Słowa kluczowe

EN

wood-polymer composites; homogenization methods; micromechanical analysis; numerical simulations; filler shape model; injection molding process

PL

kompozyty typu drewno-polimer; metody homogenizacji; analiza mikromechaniczna; symulacje numeryczne; model kształtu wypełniacza; formowanie wtryskowe

• Wydawca: Polskie Towarzystwo Materiałów Kompozytowych
• Czasopismo: Composites Theory and Practice
• Rocznik: 2019
• Tom: R. 19, nr 2
• Strony: 50--55
• Opis fizyczny: Bibliogr. 17 poz., rys., tab.

Twórcy

autor

Frącz Wiesław

• Rzeszow University of Technology, Faculty of Mechanics and Technology, Department of Integrated Design and Tribology Systems al. Kwiatkowskiego 4, 37-450 Stalowa Wola, Poland

autor

Janowski Grzegorz

• Rzeszow University of Technology, Faculty of Mechanical Engineering and Aeronautics, Department of Materials Forming and Processing al. Powstańców Warszawy 8, 35-959 Rzeszów, Poland

Bibliografia

• [1] Niska K.O., Sain M., Wood-Polymer Composites, Woodhead Publishing, Cambridge 2008.
• [2] Bledzki A.K., Sperber V.E., Faruk O., Natural and wood fibre reinforcements in polymers, Rapra Review Reports 2002, 13, 8, 1-144.
• [3] Bledzki A.K., Letman M., Viksne A., Rence L., A comparison of compounding processes and wood type for wood fibre-PP composites, Composites Part A: Applied Science and Manufacturing 2005, 36, 6, 789-797.
• [4] Klyosov A.A., Wood-Plastic Composites, John Wiley & Sons, New Jersey 2007.
• [5] Migneault S., Koubaa A., Erchiqui F., Chaala A., Englund K., Wolcott M.P., Effects of processing method and fiber size on the structure and properties of wood-plastic composites, Composites Part A: Applied Science and Manufacturing 2009, 40, 1, 80-85.
• [6] Persson K., Micromechanical modelling of wood and fibre properties, Doctoral Thesis, Lund Institute of Technology, Lund 2000.
• [7] Bednarz A., Frącz W., Janowski G., The use of image analysis in evaluation of the fibers orientation in woodpolymer composites (WPC), Open Engineering 2016, 6, 1, 737-741.
• [8] Bendsøe M.P., Kikuchi N., Generating optimal topologies in structural design using a homogenization method, Computer Methods in Applied Mechanics and Engineering 1988, 71, 2, 197-224.
• [9] Abdulle A., Numerical homogenization methods, 2013, 1-18 (No. EPFL-ARTICLE-184958).
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• [11] Doghri I., Tinel L., Micromechanics of inelastic composites with misaligned inclusions: numerical treatment of orientation, Computer Methods in Applied Mechanics and Engineering 2006, 195, 13, 1387-1406.
• [12] Tucker III C.L., Liang E., Stiffness prediction for unidirectional short-fiber composites: Review and evaluation, Composites Science and Technology 1999, 59, 5, 655-671.
• [13] Halpin J.C., Kardos J.L., The Halpin-Tsai Equations: A review, Polymer Engineering & Science 1976, 16, 5, 345-352.
• [14] Rosen B.W., Hashin Z., Effective thermal expansion coefficients and specific heats of composite materials, International Journal of Engineering Science 1970, 8, 2, 157-161.
• [15] Advani S.G., Tucker III C.L., The use of tensors to describe and predict fiber orientation in short fiber composites, Journal of Rheology 1987, 31, 8, 751-784.
• [16] Trzepieciński T., Ryzińska G., Biglar M., Gromada M., Modelling of multilayer actuator layers by homogenisation technique using Digimat software, Ceramics International 2017, 43, 3, 3259-3266.
• [17] Frącz W., Janowski G., Strength analysis of molded pieces produced from wood-polymer composites (WPC) including their complex structures, Composites Theory and Practice 2016, 16, 4, 260-265.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).