Prediction and Measurement of Residual Stresses in Injection Molded Parts

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Kwon, Young Il; Kang, Tae Jin; Chung, Kwan Soo; Youn, Jae Ryoun
Issue Date
한국섬유공학회 = The Korean Fiber Society;
Springer Verlag
Fibers and Polymers, 2, 203 (2001)
Injection MoldingResidual stressHybrid FEM/FDM schemeLayer removal methodStephan problem
Residual stresses were predicted by a flow analysis in the mold cavity and residual stress distribution in the injection
molded product was measured. Flow field was analyzed by the hybrid FEM/FDM method, using the Hele Shaw approximation. The Modified Cross model was used to determine the dependence of the viscosity on the temperature and the shear rate. The specific volume of the polymer melt which varies with the pressure and temperature fields was calculated by the Tait's state equation. Flow analysis results such as pressure, temperature, and the location of the liquid-solid interface were used as the input of the stress analysis. In order to calculate more accurate gap-wise temperature field, a coordinate transformation technique was used. The residual stress distribution in the gap-wise direction was predicted in two cases, the free quenching and the constrained quenching, under the assumption that the shrinkage of the injection molded product occurs within the mold cavity and that the solid polymer is elastic. Effects of the initial flow rate, packing pressure, and mold temperature on the residual stress distribution was discussed. Experimental results were also obtained by the layer removal method for molded polypropylene.
1229-9197 (print)
1875-0052 (online)
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
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