کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5207646 1382361 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Tensile fracture behavior of a biodegradable polymer, poly(lactic acid)
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Tensile fracture behavior of a biodegradable polymer, poly(lactic acid)
چکیده انگلیسی
The stable and dynamic fracture behavior of a biodegradable polymer, poly(lactic acid) (PLA), was investigated using single-edge-cracked tensile specimens. To study the dynamic effect of brittle facture, the specimens were pin-loaded using a special jig that allowed them to split and fly off in the loaded direction after fracture. The non-elastic effect of viscoelastic and plastic deformations was also measured using an optical high-speed extensometer, which consisted of an optical fiber and a position-sensing detector (PSD). For the stable and dynamic fracture process, external work applied to the specimen and its fracture surface was partitioned into Us and Ud, and As and Ad, respectively. The energy release rate, Gs, for stable crack growth was determined using Us/As. The kinetic and non-elastic energies were measured and subtracted from Ud to evaluate the fracture energy for the dynamic process, Ef. The dynamic energy release rate, Gf, was then determined as Ef/Ad. Gd was also obtained as Ud/Ad to correlate with Gs and Gf, and the results are discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Testing - Volume 25, Issue 5, August 2006, Pages 628-634
نویسندگان
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