کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5205544 1502933 2017 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Short Communication: Material PropertiesFracture toughness of gamma irradiated polycarbonate sheet using the essential work of fracture
ترجمه فارسی عنوان
ارتباطات کوتاه: خواص مواد چقرمگی شکست ورقه پلی کربنات تابش گاما با استفاده از کار ضروری شکستگی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
چکیده انگلیسی

Polycarbonate (PC), a ductile polymer, has been found by both linear elastic fracture mechanics and impact tests to present a ductile-brittle transition, which depends on notched specimen thickness, test speed and gamma irradiation. Owing to large amounts of plastic deformation, fracture toughness measurements by these test methods are not precise. In the present communication, a better method, the Essential Work of Fracture (EWF), to assess the fracture characteristics in plane state of stress was for the first time used to evaluate the fracture toughness of PC sheets subjected to gamma irradiation dose. Three-points bend tests of sharp pre-cracked specimens with different ligament lengths were 340 kGy gamma irradiated. EWF results showed that the total fracture work increased linearly with length for both non-irradiated and gamma irradiated conditions. A significant decrease in EWF fracture toughness was associated with brittleness promoted by gamma irradiation. This brittleness was also confirmed by macro and microscopy (SEM) evidence.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Testing - Volume 57, February 2017, Pages 115-118
نویسندگان
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