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Numerical and experimental investigation of shrinkage behavior of precision injection molded articles. I. Development of lateral motion modeling
Author(s) -
Yang Sang Sik,
Kwon Tai Hun
Publication year - 2008
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.21130
Subject(s) - shrinkage , materials science , residual stress , shearing (physics) , molding (decorative) , mechanics , stress (linguistics) , shear stress , motion (physics) , shear (geology) , structural engineering , composite material , engineering , classical mechanics , physics , philosophy , linguistics
The present study aims at improving the state of art physical modeling in the numerical simulation for a precision injection molding to take into account the shrinkage behavior observed by experimental measurements. In Part I, new lateral motion models have been developed to predict the birefringence, residual stress profiles, and effects of various processing conditions on the shrinkage altogether. In conventional models, the lateral motion is either allowed too early or totally prohibited in the cooling stage. With the new modeling, more general description of lateral motion has been achieved either by allowing the lateral motion if an averaged lateral residual stress reaches a certain value or by letting the lateral motion develop continuously when a shearing strength is equal to an estimated shear stress. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers