Numerical Simulation of Temperatures Distribution and Residual Stresses of High Melting Temperature Polymer
Main Article Content
Abstract
This work predicts the effect of thermal load distribution in polymer melt inside a mold and a die during injection and extrusion processes respectively on the structure properties of final product. Transient thermal and structure models of solidification process for polycarbonate polymer melt in a steel mold and die are studied in this research. Thermal solution obtained according to solidify the melt from 300 to 30Cand Biot number of 16 and 112 respectively for the mold and from 300 to 30 Cand Biot number of 16 for die. Thermal conductivity, and shear and Young Modulus of polycarbonate are temperature depending. Bonded contact between the polycarbonate and the steel surfaces is suggested to transfer the thermal load. The temperatures distribution produces in thermal model importing as load and boundary conditions to solve the structure model. 3D mold and die are built to simulate the thermal and structure behavior using ANSYS 12.1 program. The results show that the temperatures and residual stresses decreases with the distance from the center to surfaces for the mold ,while for the die the temperatures and stresses decreases with the distance from the inlet to the outlet. The temperatures and stresses decreases with the time increasing for both mold and die. Also the thermal strain compatible with the temperatures distribution in the mold and the die. The total deformation concentrated at the left and right edge of polycarbonate in the mold, while starting in the center of the polymer at the outlet and then transfer to the entry of the die with the time increasing.
Article Details
How to Cite
Publication Dates
References
Alexandra N. Emil O.” Improving the quality of the molded polymeric parts by reducing the residual stress” Marine engineering department, Romania, 2003.
Bryce Maxwell, M, Nguyen”Measurment of elastic properties of polymer melts” polymer engineering and science, volume 19, issue 16, pages 1140-1150,December 1979.
Du-Soon Choi, Yang-Taek” Prediction of shrinkage and warpage in consideration of residual stress in integrated simulation of injection molding” , volume 47, issues 1-4, December 1999, pages 655-665.
Guojun Xu, M.E., “ Study of thin wall injection molding” Dissertation for the degree of doctor, Ohio state university, 2004.
Johanna A., “ Rheological characterization of polymer melts in shear and extrusion ; measurement reliability and data for practical processing” Tempere university of technology. Thesis of the degree of doctor of science in technology, 2011
Postawa P.,and Kwaitkowski D.,” Residual stress distribution in injection molded parts”, Institute of polymer processing and management, Poland, 2006.
Vlado T.” Predicting residual stresses due to the solidification in cast plastic plates”, Imperial college of science technology and medicine, Thesis, 2001.
S.G. Croll, “ The origin of residual stresses in solvent –cast thermoplastic coatings”, journal of applied polymer science , volume 23, issue 3 847-858, February 1979.
Saso. R. and Matjaz. K., “ Pressure and Temperature behavior of thermoplastic polymer melts during high pressure expansion injection molding” Faculty chemical engineering, University of Ljubtjana, Slovenia, polymer Engineering and Science, 2008.
Tong Hong Wang and Wen Bie Young” Study on residual stresses of thin-walled injection molding” molding European polymer journal, volume 41, issue 10, 2005.( Virtual science library)
Tim A. Osswald and George Menges” Materials science of polymer for engineers,2nd edition, carl Hanser, Verlage, March 2003.
Tim A. Osswald Juan P. and Hernardez-Ortiz” polymer processing modeling and simulation” ,Hanser Verlage Amazon.com,2003.
Wit C. Bushko, vijay K, Stoke,” Solidification of thermoviscoelastic melts: effect of mold surface temperature differences on warpage and residual stresses” polymer engineering and science, volume 36, issue 3, pages 322-335, February 1996.
Wit C. Bushko, vijay K, Stoke,” Solidification of thermoviscoelastic melts: formulation of model problems” polymer engineering and science, volume 35, issue 4, pages 351-364, February 1995.
Yu. M. Boiko, “ Tensile, stress relaxation and dynamic mechanical behavior of polyethylene crystallized from highly deformed melts”, polymer, volume 36 , issue 7, march 1995, pages 1383-1392.