Specimen size and geometry effects on fracture toughness of Al2O3 measured with short rod and short bar chevron-notch specimens
Specimen size and geometry effects on fracture toughness of Al2O3 measured with short rod and short bar chevron-notch specimens
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样品尺寸和几何形状对短棒和短棒人字形缺口样品测量的 Al2O3 断裂韧性的影响
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
D. Munz
中科院分区：
文献类型：
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作者：
J. Shannon;D. Munz
对Al_2O_3的平面应变断裂韧性进行了测量，用作者先前校准过的短棒和短棒人字形缺口试件的无量纲应力强度因子系数。测量的韧性随试件尺寸、比例和人字形缺口角度的变化而明显变化，这是因为它们对裂纹扩展到最大载荷的量(测量点)的影响。用疑似上升的R曲线解释了韧性的变化，并讨论了当用人字形缺口试件测试R曲线上升的材料时，在计算KsubIC时不可避免的不精确度。
Plane strain fracture toughness measurements were made on Al2O3 using short rod and short bar chevron notch specimens previously calibrated by the authors for their dimensionless stress intensity factor coefficients. The measured toughness varied systematically with variations in specimen size, proportions, and chevron notch angle apparently due to their influence on the amount of crack extension to maximum load (the measurement point). The toughness variations are explained in terms of a suspected rising R curve for the material tested, along with a discussion of an unavoidable imprecision in the calculation of K sub Ic for materials with rising R curves when tested with chevron notch specimens.