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Thermal effects in the necking of polymers
Author(s) -
Liu TuoMin,
Harrison I. R.
Publication year - 1987
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.760271808
Subject(s) - necking , materials science , polypropylene , composite material , polyethylene , work (physics) , fraction (chemistry) , mass fraction , polymer , thermal , heat transfer , thermodynamics , chemistry , physics , organic chemistry
A certain fraction of the mechanical work performed on a specimen is converted into heat during necking of plastic material. A method for measuring this fraction is proposed when specimens are drawn in two different surroundings, air and water. Differences in the heat transfer coefficients of these two media influence the temperature rise during necking. The fraction (α) of mechanical work converted into heat can be calculated using data determined at only one draw rate. The value of α calculated for polypropylene is 0.55 and for polyethylene it is 0.48.