Numerical simulation of flow-induced birefringence in injection molded disk

Goang-Ding Shyu; Avraam I. Isayev; Ho-Sang Lee

Korea-Australia Rheology Journal, Vol.15, No.4, 159-166, December, 2003

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Numerical simulation of flow-induced birefringence in injection molded disk

Goang-Ding Shyu, Avraam I. Isayev, and Ho-Sang Lee^{1, †}

Institute of Polymer Engineering, The University of Akron, Akron, OH 44325-0301, USA
¹Department of Mechanical Design Engineering, Chungju National University, 123 Kumdan-ri, Iryu-myon,Chungju, Chungbuk 380-702, Korea

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This study is an attempt to understand the birefringence and stress development in an injection molded disk. A computer code was developed to simulate all three stages of the injection molding process filling, packing and cooling by finite element method. The constitutive equation used here was compressible Leonov model. The PVT relationship was assumed to follow the Tait equation. The flow-induced birefringence was related to the calculated flow stresses through the linear stress-optical law. The predicted birefringence was in good agreement with the experimental results.

Keywords:birefringence;viscoelasticity;injection molding;polystyrene

[References]

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Chen SC, Chen YC, Peng HS, Huang LT, Adv. Polym. Technol., 21(3), 177 (2002)
Famili N, Isayev AI, Modeling of Polymer Processing: Recent Development, Hanser, Munich (1991)
Flaman AA, Polym. Eng. Sci., 33, 193 (1993)
Greener J, Kisel R, Contestable BA, AIChE J., 35, 449 (1989)
Guo X, Isayev AI, Int. Polym. Process., 14(4), 387 (1999)
Isayev AI, Polym. Eng. Sci., 23, 271 (1983)
Isayev AI, Modeling of Polymer Processing: Recent Development, Hanser, Munich (1991)
Isayev AI, Hieber CA, Rheol. Acta, 19, 168 (1980)
Isayev AI, Injection and Compression Molding Fundamentals, Marcel Dekker, New York (1987)
Janeschitz-Kriegl H, Polymer Melt Rheology and Flow Birefringence, Springer, Berlin (1983)
Kim IH, Park SJ, Chung ST, Kwon TH, Polym. Eng. Sci., 39(10), 1930 (1999)
Lee YB, Kwon TH, Yoon K, Polym. Eng. Sci., 42(11), 2246 (2002)
Ojima M, Saito A, Kaku T, Ito M, Tsunoda Y, Takayama S, Sugita Y, Appl. Opt., 25, 483 (1986)
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Sobhanie M, Isayev AI, Rubber Chem. Technol., 62, 939 (1989)
Takeshima M, Funakoshi N, J. Appl. Polym. Sci., 32, 3457 (1986)
Wang VW, Hieber CA, Wang KK, J. Polym. Eng., 7, 21 (1986)
Wimbereger-Friedl R, Prog. Polym. Sci., 20, 369 (1995)
Yoon K, Korean J. Rheol., 7(1), 19 (1995)
Yu JS, Wagner AH, Kalyon DM, J. Appl. Polym. Sci., 44, 477 (1992)

[1] Baaijens FPT, Rheol. Acta, 30, 284 (1991)

[2] Chen SC, Chen YC, Peng HS, Huang LT, Adv. Polym. Technol., 21(3), 177 (2002)

[3] Famili N, Isayev AI, Modeling of Polymer Processing: Recent Development, Hanser, Munich (1991)

[4] Flaman AA, Polym. Eng. Sci., 33, 193 (1993)

[5] Greener J, Kisel R, Contestable BA, AIChE J., 35, 449 (1989)

[6] Guo X, Isayev AI, Int. Polym. Process., 14(4), 387 (1999)

[7] Isayev AI, Polym. Eng. Sci., 23, 271 (1983)

[8] Isayev AI, Modeling of Polymer Processing: Recent Development, Hanser, Munich (1991)

[9] Isayev AI, Hieber CA, Rheol. Acta, 19, 168 (1980)

[10] Isayev AI, Injection and Compression Molding Fundamentals, Marcel Dekker, New York (1987)

[11] Janeschitz-Kriegl H, Polymer Melt Rheology and Flow Birefringence, Springer, Berlin (1983)

[12] Kim IH, Park SJ, Chung ST, Kwon TH, Polym. Eng. Sci., 39(10), 1930 (1999)

[13] Lee YB, Kwon TH, Yoon K, Polym. Eng. Sci., 42(11), 2246 (2002)

[14] Ojima M, Saito A, Kaku T, Ito M, Tsunoda Y, Takayama S, Sugita Y, Appl. Opt., 25, 483 (1986)

[15] Shyu GD, Birefringence and Residual Stresses in Molded Articles of Amorphous Polymers, Ph.D. Dissertation, The University of Akron (1993)

[16] Shyu GD, Isayev AI, Residual Stresses and Birefringence in Injection Molded Disks, SPE ANTEC Tech Papers, 41, 2911 (1995)

[17] Sobhanie M, Isayev AI, Rubber Chem. Technol., 62, 939 (1989)

[18] Takeshima M, Funakoshi N, J. Appl. Polym. Sci., 32, 3457 (1986)

[19] Wang VW, Hieber CA, Wang KK, J. Polym. Eng., 7, 21 (1986)

[20] Wimbereger-Friedl R, Prog. Polym. Sci., 20, 369 (1995)

[21] Yoon K, Korean J. Rheol., 7(1), 19 (1995)

[22] Yu JS, Wagner AH, Kalyon DM, J. Appl. Polym. Sci., 44, 477 (1992)