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The bending of polymers under tension as related to a deep drawing process
Author(s) -
Buettner William B.,
Marshall D. I.,
Manson John A.
Publication year - 1972
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.760120604
Subject(s) - crazing , materials science , composite material , deep drawing , tension (geology) , deformation (meteorology) , acrylonitrile butadiene styrene , bending , ultimate tensile strength , elongation , polymer , stress (linguistics) , polyvinyl chloride , blank , linguistics , philosophy
Two engineering plastics, an acrylonitrile‐butadiene‐styrene resin (ABS resin, Cycolac MS) and a rigid polyvinyl chloride resin (PVC resin, Dacovin 2082) were investigated to determine the effects of cold working. In particular, the “bending under tension” stress system of a deep drawing process was considered. The object was to determine the effect of the blank‐holder pressure, the ratio of the punch radius to the material thickness, the speed of deformation and the temperature of deformation. The stress‐strain characteristics of the deformed and undeformed material were markedly different. Upper yield points were lower in the deformed specimens, the tensile strengths were decreased by 10 to 15% and the %‐elongation at break was higher—up to double the values for underformed specimens. An analysis indicated that these effects can be attributed to non‐homogeneous yielding. The results also indicated that crazing plays an important role in permitting an ABS material to permanently conform to a radius with no geometric constraints.