| 4 | Crack patterns corresponding to the residual strength plateau of ceramics subjected to thermal shock显示文摘The formation mechanism of the residualstrength plateau of ceramics subjected to thermal shockis addressed.A set of thermal shock experimentsof 99Al2O3 are conducted,where the thin specimensof 1 mm × 10 mm × 50 mm exhibit parallel through edgecracks,and thus permit quantitative measurements of thecrack patterns.The cracks evolve with the severity of thermal shock.It is found that there is a correlation between thelength and density of the thermal shock cracks.The increaseof crack length weakens the residual strength,whereas theincrease of crack density improves it.In a considerably widetemperature range,the two contrary effects just counteracteach other;consequently a plateau appears in the variationcurve of the residual strength.A comparison between thenumerical and experimental results of the residual strengthis made,and they are found in good agreement.This work ishelpful to a deep understanding of the thermal shock failureof ceramics. | H.-L.Hou X.-E Wu P.Yan F.Song J.Li C.-P.Jiang | 2012 | Acta Mechanica Sinica2012，28，3： | 0 |
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