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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 composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.10275
Subject(s) - materials science , viscoelasticity , shear modulus , creep , composite material , relaxation (psychology) , poisson distribution , poisson's ratio , modulus , methyl methacrylate , bulk modulus , poly(methyl methacrylate) , shear (geology) , context (archaeology) , torsion (gastropod) , thermodynamics , polymer , monomer , mathematics , physics , medicine , psychology , social psychology , paleontology , statistics , surgery , biology
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.