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

[+] Author and Article Information
Cheng Ping Chiu, Min Chin Hsieh

Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan, R.O.C.

J. Eng. Mater. Technol 109(2), 171-175 (Apr 01, 1987) (5 pages) doi:10.1115/1.3225958 History: Received March 04, 1986; Online September 15, 2009


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 (<10g/s), the residual stresses are tensile in the surface layer and compressive in the interior. The results also indicated that the higher the injection rate, the lower the residual stresses; the compressive residual stresses increased in proportion to the increase of holding pressure; the residual stresses could be decreased by keeping a higher mold temperature; the longer the holding time, the higher the compressive R.S. and the lower the tensile R.S.

Copyright © 1987 by ASME
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