Premium
Determination of stresses in formed plastics parts
Author(s) -
Dixon Robert R.
Publication year - 1966
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.760060212
Subject(s) - materials science , creep , shrinkage , composite material , modulus , stress (linguistics) , internal stress , ultimate tensile strength , stress–strain curve , young's modulus , deformation (meteorology) , philosophy , linguistics
To determine the optimum conditions for vacuum forming quality parts, a precise method of determining internal stress required development. The approach investigated was based on the shrinkage of a heated stressed part. Small stress should be proportioned to strain. By exposing loaded tensile specimens simultaneously with the formed part, the material modulus is determined. Results indicated creep which was minimized by using the correct modulus to calculate internal stress. Stresses in a normally formed part and in a part formed cool were compared at two temperatures. Values were higher in most areas of the cool‐formed part and consistent at the two temperatures. This method probably can be used on other materials and possibly on injection molded parts.