Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
A noncontacting experimental procedure is used for characterizing lateral strain effects during the large-strain uniaxial stretching of flat sheet-like specimens of polycarbonate, polyetherimide, and poly(butylene terephthalate), both at room and elevated temperatures. It is shown that the in-plane lateral stretch, λ2, is related to the longitudinal stretch, λ1, through the relation λ2 = λ1-n. Depending on the temperature, the “Poisson's ratio” for incremental strains, n, is shown to lie between n = 0.4 and n = 0.5. While the lateral stretch in the thickness direction, λ3, is smaller than λ2 at room temperature, it is shown that λ3 = λ2 at higher temperatures. Stretch data have been used to infer the volumetric strains in these materials.
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