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- W2110246544 abstract "Abstract The introduction of true stress strain measurements, at constant strain rate, has promoted the development of empirical or semiempirical models for large deformations in thermoplastics. One such theory, which proposes that the post yield deformation process can be represented by equations derived from the theories of rubber elasticity, has been successfully applied to several glassy polymers. Unexpectedly, it can also model the post yield deformation of many different grades of polyethylene, even when rubber theory is employed in the simplest Gaussian form. Strain hardening is then represented by the single strain hardening coefficient Gp. Examples are given of this equation, which can be modified to give the true engineering or nominal stress σ n and then be differentiated to give dσ n /dλ = Gp − Y 0 / λ 2 + 2Gp / λ 3 , where Y 0 is the yield stress and λ the extension ratio. Negative values of this differential then predict the onset of necking in tension and positive values stabilization of the neck. The relation of Gp to molecular weight is then discussed using literature measurements for polyethylenes of differing molecular weight and similar molecular weight distributions. When these results are then plotted, a strong dependency of Gp on molecular weight is observed. Some implications of these measurements are then considered. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 1090–1099, 2007" @default.
- W2110246544 created "2016-06-24" @default.
- W2110246544 creator A5018702786 @default.
- W2110246544 date "2007-03-26" @default.
- W2110246544 modified "2023-10-16" @default.
- W2110246544 title "Strain hardening of high density polyethylene" @default.
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- W2110246544 doi "https://doi.org/10.1002/polb.21123" @default.
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