کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
281016 1430397 2006 26 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mechanics of the rate-dependent elastic–plastic deformation of glassy polymers from low to high strain rates
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
پیش نمایش صفحه اول مقاله
Mechanics of the rate-dependent elastic–plastic deformation of glassy polymers from low to high strain rates
چکیده انگلیسی

A combined experimental and analytical investigation has been performed to understand the mechanical behavior of two amorphous polymers—polycarbonate and poly(methyl methacrylate)—at strain rates ranging from 10−4 to 104 s−1. This range in strain rates was achieved in uniaxial tension and compression tests using a dynamic mechanical analyzer (DMA), a servo-hydraulic testing machine, and an aluminum split-Hopkinson pressure bar. DMA tension tests were used to characterize the viscoelastic behavior of these materials, with focus on the rate-dependent shift of material transition temperatures. Uniaxial compression tests on the servo-hydraulic machine (10−4 to 1 s−1) and the split-Hopkinson pressure bar (103 to 104 s−1) were used to characterize the rate-dependent yield and post-yield behavior. Both materials were observed to exhibit increased rate sensitivity of yield under the same strain rate/temperature conditions as the β-transition of the viscoelastic behavior. A physically based constitutive model for large strain deformation of thermoplastics was then extended to encompass high-rate conditions. The model accounts for the contributions of different molecular motions which become operational and important in different frequency regimes. The new features enable the model to not only capture the transition in the yield behavior, but also accurately predict the post-yield, large strain behavior over a wide range of temperatures and strain rates.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Solids and Structures - Volume 43, Issue 5, March 2006, Pages 1331–1356
نویسندگان
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