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Uniaxial, shear, and poisson relaxation and their conversion to bulk relaxation: Studies on poly(methyl methacrylate)
Author(s) -
Lu H.,
Zhang X.,
Knauss W. G.
Publication year - 1997
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.11750
Subject(s) - materials science , viscoelasticity , shear modulus , creep , relaxation (psychology) , poisson distribution , poly(methyl methacrylate) , methyl methacrylate , poisson's ratio , modulus , composite material , bulk modulus , context (archaeology) , torsion (gastropod) , thermodynamics , shear (geology) , polymer , monomer , mathematics , physics , medicine , paleontology , statistics , surgery , biology , psychology , social psychology
Abstract Multiple viscoelastic properties were determined for poly(methyl methacrylate) in the context of examining experimental limitations on deriving other properties from these measurements, specifically time dependent bulk modulus behavior. By means of master curves for uniaxial extension on plate and cylinder specimens, as well as shear (torsion) and Poisson behavior from measurements in the temperature range from −40°C to 125°C, it is established that excessive precision is needed for reliable interconversion of some properties to others. While normal inverse relations (modulus‐compliance) are readily obtained from one set of measurements, bulk (relaxation or creep) properties cannot be derived reliably from other functions and must be determined directly.