Authors: R H Ion H M Pollock C RoquesCarmes
Publish Date: 1990/02/01
Volume: 25, Issue: 2, Pages: 1444-1454
Abstract
The plastic elastic and flow properties of the nearsurface region of polyethylene terephthalate either amorphous or uniaxially drawn are measured by means of a submicroindentation technique with continuous depth recording The depths investigated range from 02 to 6 Μm The drawn material is harder with a larger value of elastic recovery parameter and a depthload characteristic that indicates a departure from typical bulk behaviour From “slow loading” tests values of plasticity indices and of Youngs modulus are derived In “abrupt loading” tests the total recoverable deformation is greater at depths less than 300 nm the behaviour is pseudoplastic while at greater depths the deformation is dominated by a Chassettype anelastic compliance
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