The purpose of this study is to investigate the boundary effect on the growth of a 3-D crack under uniaxiai compression. The distance from the center of flaw to the free boundary (D) is varied from D/c=1 .5 to 3.5, where c is the half flaw length. The larger value of D/c, the higher the stress for flaw initiation is required. However for the D/c greater than a certain value (say D/c≥3), the stress of flaw initiation is kept constant. Furthermore as for the same D/c, the thicker the specimens, the higher the stress of flaw initiation is required. Growth faster when the flaw tip close to the side boundary (say D/c≤1 .5).
展开▼
机译：这项研究的目的是研究边界在单向压缩下对3-D裂纹扩展的影响。从缺陷中心到自由边界（D）的距离从D / c = 1 .5到3.5变化，其中c是缺陷的一半长度。 D / c值越大，缺陷引发所需要的应力就越大。但是，如果D / c大于某个值（例如D /c≥3），则裂纹产生的应力将保持恒定。此外，对于相同的D / c，试样越厚，则要求产生裂纹的应力越大。当缺陷尖端靠近侧面边界时（例如D /c≤1.5），生长更快。
展开▼
