Recovering nonisothermal physical aging shift factors via continuous test data: Theory and experimental results
Article Abstract:
A few simple tests to characterize isothermal aging shift factors offer reasonable prediction of mechanical response. A new technique has been developed to determine aging shift factors in creep data during a nonisothermal history. The new continuous shift factor method uses the validity of effective time theory, generating a continuous experimental shift factor curve in a single test. When applied to a polyimide/carbon fiber compostie material tested under temperature jump conditions, the nonisothermal aging data showed a similar response to that of homogeneous polymers.
Publication Name: Journal of Engineering Materials and Technology
Subject: Science and technology
ISSN: 0094-4289
Year: 1997
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Influence of inclusion microgeometry on some thermomechanical properties of isotropic polymer-matrix composites
Article Abstract:
The influence of inclusion shape on the thermomechanical properties of an isotropic viscoeleastic composties, is considered. The properties inlcude cyclic stress-strain behaviour, cyclic creep, master compliance curve and effective thermal expansion coefficient.The study used micromechanical theory and found that the complex shear modulus of the composite with various inclusion shapes lies on or within the bounds of Milton and Berryman. It was demonstrated that the compliance curves at different temperatures could be plotted into one master one in a reduced time scale.
Publication Name: Journal of Engineering Materials and Technology
Subject: Science and technology
ISSN: 0094-4289
Year: 1997
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Deformation micromechanics of regenerated cellulose fibers using Raman spectroscopy
Article Abstract:
Raman spectroscopy can be used to study molecular deformation in TENCEL fibres. Raman bands move to lower frequency on the application of tensile stress or strain in peak positions of 895 cm -1 and 1095 cm -1. The change is relating to molecular stress rather than strain, and the molecular deformation processes for tencel are similar to those for other conventional polymers.
Publication Name: Journal of Engineering Materials and Technology
Subject: Science and technology
ISSN: 0094-4289
Year: 1997
User Contributions:
Comment about this article or add new information about this topic:
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