Method for Measuring Short-Crack R-Curves without Calibration Parameters: Case Studies on Alumina and Alumina/Aluminum Composites
Method for Measuring Short-Crack R-Curves without Calibration Parameters: Case Studies on Alumina and Alumina/Aluminum Composites
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无校准参数的短裂纹 R 曲线测量方法：氧化铝和氧化铝/铝复合材料的案例研究
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
J. Rödel
中科院分区：
文献类型：
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作者：
M. Štěch;J. Rödel
介绍了一种不需要独立确定标定因子，利用平衡裂纹形状条件计算表面裂纹形状因子的短裂纹r曲线测量方法。在裂纹长度小于100 {micro}m到接近1000 {micro}m范围内，测量了两种不同晶粒尺寸的氧化铝和铝/氧化铝复合材料的r曲线。计算得到的裂缝深度曲线与实验得到的裂缝椭圆度偏差在{-}22% ~ +26%之间，符合较好，证实了该方法的可靠性。
A method to measure short-crack R-curves is introduced which does not require an independent determination of calibration factors and which utilizes an equilibrium crack shape condition to compute the shape factor of a surface crack. R-curves of an alumina with two different grain sizes and of an aluminum/alumina composite were measured in the crack length regime of below 100 {micro}m up to almost 1,000 {micro}m. Calculated and experimentally obtained crack depth profiles were in good agreement with deviations being between {minus}22% and +26% for the crack ellipticity and confirmed the reliability of the method.