Optimum design of process conditions to minimize residual stresses in injection-molded parts

Shinill Kang, C. A. Hieber, K. K. Wang

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

An inverse design method has been developed to obtain an optimum mold-wall-temperature history that produces an injection-molded part with minimum residual-stress distribution. Optimization has been formulated within the framework of nonlinear least squares and a modified Gauss-Newton method with a zeroth-order regularization technique. The transient temperature field has been generated based upon a purely viscous formulation of the filling and post-filling stages, and the cooling-induced residual stresses have been calculated employing a thermo-rheologically simple, linear viscoelastic model. The present study shows that, with an optimum cooling history, maximum residual-stress levels can be reduced significantly for both unconstrained and constrained vitrification with holding pressure.

Original languageEnglish
Pages (from-to)141-155
Number of pages15
JournalJournal of Thermal Stresses
Volume21
Issue number2
DOIs
Publication statusPublished - 1998 Mar

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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