Static Fatigue in Glasses and Alumina
Experimental results on delayed failure of FN borosilicate glass fused silica, and polycrystalline alumina are presented and compared with previous results on soda-lime silicate glasses. For higher stresses the results for the glasses fit on a universal curve; at lower stresses the reduced time for failure for FN and fused silica becomes longer than for soda-lime glass. The alumina data show a different slope than those for the glasses, implying a different corrosion reaction.
Static fatigue data define conditions for proof tests for ceramic parts subject to load. A plot of log stress against log failure time is particularly valuable for this definition, and allows one to calculate the time and stress for a convenient proof test.
KeywordsFuse Silica Failure Time Liquid Nitrogen Temperature Static Fatigue Universal Curve
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