A fast and effective methodology integrating the finite-element and Taguchi methods is presented to determine the optimal design conditions of the injection molding process for short-fiber-reinforced polycarbonate composites. The finite-element-based flow simulation software, M-flow, was employed to simulate the molding process to obtain the fiber orientation distributions required. The Taguchi optimization technique was used to identify the optimal settings of injection molding parameters to maximize the shear layer thickness. The effects of four main parameters — the filling time, melt temperature, mold temperature, and injection speed — on the fiber orientation or the shear layer thickness were investigated and discussed. It is found that the dominant parameter is the filling time. The best levels of the four parameters to acquire the thickest shear layer are also identified.
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T. Matsuoka, J. Takabatake, Y. Inoue, and H. Takahashi, “Prediction of fiber orientation in injection molding parts of short-fiber-reinforced thermoplastics,” Polym. Eng. Sci., 30, 957–966 (1990).
G. S. Springer and Q. Wang, “The effects of form on the mechanical properties of glass fiber reinforced composites,” J. Rein. Plastics Compos., 13, 448–466 (1994).
C. F. Hung and Y. K. Shen, “Numerical simulation of fiber orientation in injection mold filling,” Int. Com. Heat Mass Tran., 22, 791–802 (1995).
K. C. Ho and J. R. Hwang, “Impact fatigue of short glass fiber reinforced polycarbonate,” J. Rein. Plastics Compos., 16, 903–905 (1997).
S. C. Lee, D. Y. Yang, J. Ko, and J. R. Youn, “Effect of compressibility on flow field and fiber orientation during the filling stage of injection molding,” J. Mater. Process. Tech., 70, 83–92 (1997).
J. P. Greene and J. O. Wilkes, “Numerical analysis of injection molding of glass fiber reinforced thermoplastics. Part 2: Fiber orientation,” Polym. Engng. Sci., 37, 1019–1035 (1997).
T. P. Skourlis, C. Chassapis, and S. Manoochehri, “Fiber orientation morphological layers in injection molded long fiber reinforced thermoplastics,” J. Therm. Compos. Mater., 10, 453–475 (1997).
N. M. Neves, G. Isdell, A. S. Pouzada, and P. C. Powell, “On the effect of the fiber orientation on the flexural stiffness of injection molded short fiber reinforced polycarbonate plates,” Polym. Compos., 19, 640–651 (1998).
S. H. Chang, J. R. Hwang, and J. L. Doong, “Optimization of the injection molding process of short glass fiber reinforced polycarbonate composites using grey relational analysis,” J. Mater. Process. Tech., 97, 186–193 (2000).
T. Aurich and G. Mennig, “Flow-induced fiber orientation in injection molded flax fiber reinforced polypropylene,” Polym. Compos., 22, 680–689 (2001).
E. G. Kim, J. K. Park, and S. H. Jo, “A study on fiber orientation during the injection molding of fiber-reinforced polymeric composites: Comparison between image processing results and numerical simulation,” J. Mater. Proess. Tech., 111, 225–232 (2001).
K. H. Han and Y. T. Im, “Numerical simulation of three-dimensional fiber orientation in injection molding including fountain flow effect,” Polym. Compos., 23, 222–238 (2002).
E. S. Zainudin, S. M. Sapuan, S. Sulaiman, and M. M. H. M. Ahmad, “Fiber orientation of short fiber reinforced injection molded thermoplastic composites: A review,” J. Inject. Mold. Tech., 6, 1–10 (2002).
A. J. Pontes, N. M. Neves, and A. S. Pouzada, “The role of the interaction coefficient in the prediction of the fiber orientation in planar injection moldings,” Polym. Compos., 24, 358–366 (2003).
P. J. Hine and R. A. Duckett, “Fiber orientation structures and mechanical properties of injection molded short glass fiber reinforced ribbed plates,” Polym. Compos., 25, 237–254 (2004).
F. Ahmad, “Orientation of short fibers in powder injection molded aluminum matrix composites,” J. Mater. Process. Tech., 169, 263–269 (2005).
M. Vincent, T. Giroud, A. Clarke, and C. Eberhardt, “Description and modeling of fiber orientation in injection molding of fiber reinforced thermoplastics,” Fluid Phase Equil., 234, 6719–6725 (2005).
J. W. Kim and D. G. Lee, “Fiber orientation state depending on the injection mold gate variations during FRP injection molding,” Key Eng. Mater., 321, 938–941 (2006).
C. A. Silva, J. C. Viana, H. Van, W. J. Ferrie, and A. M. Cunha, “Fiber orientation in divergent/convergent flows in expansion and compression injection molding,” Polym. Compos., 27, 539–551 (2006).
C. Kröner, H. Altenbach, and K. Naumenko, “Coupling of a structural analysis and flow simulation for short-fiberreinforced polymers: property prediction and transfer of results,” Mech. Compos. Mater., 45, 249–256 (2009).
Z. Y. Sun, H. S. Han, and G. C. Dai, “Mechanical properties of injection-molded natural fiber-reinforced polypropylene composites: Formulation and compounding processes” J. Rein. Plastics Compos., 29, 637–650 (2010).
C. S. Chen, W. S. Cheng, T. S. Wang, and R. D. Chien, “Optimum design of gas-assisted injection molding,” J Rein. Plastics Compos., 24, 1577–1586 (2005).
H. Oktem, T. Erzurumlu, and I. Uzman, “Application of Taguchi optimization technique in determining plastic injection molding process parameters for a thin-shell part,” Mater. Design, 28, 1271–1278 (2007).
T. Erzurumlu and B. Ozcelik, “Minimization of warpage and sink index in injection-molded thermoplastic parts using Taguchi optimization method,” Mater. Design, 27, 853–861 (2006).
C. P. Fung and P. C. Kang, “Multi-response optimization in friction properties of PBT composites using Taguchi method and principle component analysis,” J. Mater. Process. Tech., 170, 602–610 (2005).
S. H. Tang, Y. J. Tan, S. M. Sapuan, S. Sulaiman, N. Ismail, and R. Samin, “The use of Taguchi method in the design of plastic injection mould for reducing warpage,” J. Mater. Process. Tech., 182, 418–426 (2007).
W. S. Cheng, C. S. Chen, S. C. Chen, and R. D. Chien, “Investigation of the effects of injection molding processing parameters on conductive polymeric composites for electromagnetic interference shielding effectiveness,” Polymer-Plastics Tech. Eng., 48, 216–220 (2009).
M. Altan, “Reducing shrinkage in injection moldings via the Taguchi, ANOVA, and neural network methods,” Mater. Design, 31, 599–604 (2010).
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Russian translation published in Mekhanika Kompozitnykh Materialov, Vol. 47, No. 3, pp. 519–532, May-June, 2011.
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Chen, CS., Chen, TJ., Chen, SC. et al. Optimization of the injection molding process for short-fiber-reinforced composites. Mech Compos Mater 47, 359–368 (2011). https://doi.org/10.1007/s11029-011-9214-x
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DOI: https://doi.org/10.1007/s11029-011-9214-x