SHORT CRACK BEHAVIOUR IN NODULAR CAST IRON
SHORT CRACK BEHAVIOUR IN NODULAR CAST IRON
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球墨铸铁的短裂纹行为
DOI：
10.1111/j.1460-2695.1984.tb00194.x
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发表时间：
1984
影响因子：
3.7
通讯作者：
A. Pineau
中科院分区：
文献类型：
--
作者：
P. Clement;J. Angeli;A. Pineau
对含有长裂纹（φ 5- 10 mm）的标准试样和含有二维短裂纹（φ 0.10-0.50mm）的试样进行了疲劳裂纹扩展速率的测定。已经观察到的大的差异表明，在给定的应力强度因子短裂纹比长裂纹扩展快得多。两种试样几何形状的开口位移测量结果表明，裂纹闭合效应在很大程度上是所观察到的效果负责。这些结果被用来合理化的行为，短裂纹从天然网站，这是无论是石墨球或微收缩孔。这些自然的小裂纹的三维方面进行了详细的分析和讨论。
Fatigue crack growth rates have been determined on standard specimens containing long cracks (∼5–10mm) and on specimens containing two-dimensional short cracks (∼0.10–0.50mm). Large differences have been observed indicating that at a given stress intensity factor short cracks propagate much faster than long cracks. Mouth opening displacement measurements for both specimen geometries have shown that the crack closure effect is largely responsible for the observed effect. These results are used to rationalize the behaviour of short cracks initiated from natural sites which were either graphite nodules or microshrinkage pores. The three-dimensional aspect of these natural small cracks is analysed and discussed in detail.