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Dynamic measurement of mechanical moduli I
Author(s) -
Lewis Armand F.,
Tobin Marvin C.
Publication year - 1961
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.760010407
Subject(s) - materials science , poisson's ratio , shear modulus , composite material , modulus , young's modulus , moduli , polypropylene , vibration , poisson distribution , aggregate modulus , damping ratio , glass transition , dynamic modulus , polymer , dynamic mechanical analysis , acoustics , mathematics , physics , statistics , quantum mechanics
Abstract Equipment is described for measurement of Young's and shear modulus on the same identical polymer sample, by a free‐vibration method. Strain gauges are used as sensors in an automatic recorder. Young's modulus and damping, shear modulus and damping and Poisson's ratio are reported over a range of temperature for polypropylene, Nylon 66 and poly (methylmethacrylate). It is found that Poisson's ratio shows a dip in the glass transition region and that values greater than the infinitesimal strain limit of 0.5 are obtained in the rubbery region.