کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1422948 986468 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Residual stress in glass: Indentation crack and fractography approaches
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد بیومتریال
پیش نمایش صفحه اول مقاله
Residual stress in glass: Indentation crack and fractography approaches
چکیده انگلیسی

ObjectiveTo test the hypothesis that the indentation crack technique can determine surface residual stresses that are not statistically significantly different from those determined from the analytical procedure using surface cracks, the four-point flexure test, and fracture surface analysis.MethodsSoda-lime–silica glass bar specimens (4 mm × 2.3 mm × 28 mm) were prepared and annealed at 650 °C for 30 min before testing. The fracture toughness values of the glass bars were determined from 12 specimens based on induced surface cracks, four-point flexure, and fractographic analysis. To determine the residual stress from the indentation technique, 18 specimens were indented under 19.6 N load using a Vickers microhardness indenter. Crack lengths were measured within 1 min and 24 h after indentation, and the measured crack lengths were compared with the mean crack lengths of annealed specimens. Residual stress was calculated from an equation developed for the indentation technique. All specimens were fractured in a four-point flexure fixture and the residual stress was calculated from the strength and measured crack sizes on the fracture surfaces.ResultsThe results show that there was no significant difference between the residual stresses calculated from the two techniques. However, the differences in mean residual stresses calculated within 1 min compared with those calculated after 24 h were statistically significant (p = 0.003).SignificanceThis study compared the indentation technique with the fractographic analysis method for determining the residual stress in the surface of soda-lime–silica glass. The indentation method may be useful for estimating residual stress in glass.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Dental Materials - Volume 25, Issue 11, November 2009, Pages 1453–1458
نویسندگان
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