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Does the strain hardening modulus of glassy polymers scale with the flow stress?

Does the strain hardening modulus of glassy polymers scale with the flow stress?,10.1002/polb.21579,Journal of Polymer Science Part B-polymer Physics,

Does the strain hardening modulus of glassy polymers scale with the flow stress?   (Citations: 6)
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Using a generic coarse-grained bead-spring model, Hoy and Robbins reproduced important experimental observations on strain hardening, specifically the generally observed Gaussian strain hardening response and its dependence on net- work density and temperature. Moreover, their simulation results showed that the strain hardening response at different strain rates collapses to a single curve when scaled to the value of the flow stress, a phenomenon that has not yet been verified experimentally. In the present study, the proposed scaling law is experimentally investigated on a variety of polymer glasses: poly(methyl methacrylate), poly(pheny- lene ether), polycarbonate, polystyrene, and poly(ethylene terephthalate)-glycol. For these polymers, true stress-strain curves in uniaxial compression were collected over a range of strain rates and temperatures and scaled to the flow stress. It was found that, generally, the curves do not collapse on a mastercurve. In all cases, the strain hardening modulus is observed to increase linearly, but not proportionally to the flow stress. The experimental data, therefore, unambiguously demonstrate that the pro- posed scaling law does not apply within the range of temperature and strain rate covered in this study. V V C 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 2475-2481, 2008
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