The Correlation Between the Residual Stresses of ABS Terpolymers and Injection Molding Conditions

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Abstract
Residual stresses (R.S.) in a microcomputer-controlled injection molded ABS terpolymers have been determined. The layer-removal method and the microscopic measurement techniques were used to evaluate the stresses in these molded articles. The relationship between the R.S. and the processing parameters such as injection pressure, holding pressure, holding time, injection rate, and mold temperature was studied. Experimental results indicated that, at the higher injection rates (>10g/s), the R.S. are compressive in the surface layer and tensile in the interior; however, at the lower injection rates (

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