Fracture toughness of glasses as measured by the SCF and SEPB methods

The fracture toughness, KIc, of six glasses was measured by the surface crack in flexure (SCF) and single-edged precracked beam (SEPB) methods. Results depended upon the loading rate as well as the test environment. Environmentally-assisted slow crack growth affects the results for tests done in air...

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Published in:Journal of the European Ceramic Society 2017-11, Vol.37 (14), p.4243-4257
Main Authors: Quinn, George D., Swab, Jeffrey J.
Format: Article
Language:English
Subjects:
Borosilicate
Crack healing
Fractography
Fracture toughness
Fused silica
Glass
Single-Edge precracked beam
Surface crack in flexure
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description The fracture toughness, KIc, of six glasses was measured by the surface crack in flexure (SCF) and single-edged precracked beam (SEPB) methods. Results depended upon the loading rate as well as the test environment. Environmentally-assisted slow crack growth affects the results for tests done in air. Dry nitrogen testing is preferred. Crack healing may be a severe complicating factor with precracked flexure bar type specimens if the specimens are unloaded between the precracking and final fracture test. Success in KIc testing depends to a large degree on upon the ability to make good precracks.
doi_str_mv 10.1016/j.jeurceramsoc.2017.05.012
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subjects Borosilicate
Crack healing
Fractography
Fracture toughness
Fused silica
Glass
Single-Edge precracked beam
Surface crack in flexure
title Fracture toughness of glasses as measured by the SCF and SEPB methods
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