有限板の円孔から発生した非対称き裂および有限板に発生した非対称き裂の引張りにおける応力拡大係数について

概要

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The stress intensity factor of a finite specimen with an unsymmetrical crack initiated from a hole due to tension was calculated. The geometric stress intensity factor of this specimen with the cracked hole was compared with that of a center cracked plate, whose length was equal to the sum of the diameter of the hole and length of the crack. R_F was defined as the ratio of these geometric factors, where the nondimensional diameter of the hole a/W is less than 0.2 and R_F is less than 1.1 after the crack growth length c/W reaches 0.1. 2a, 2c, and 2W are the diameter of the hole, length of the crack from the edge of the hole, and width of the plate, respectively. Therefore, the stress intensity factor of a plate with cracks initiated from holes on its surface can be approximated within 10% error by the stress intensity of a center cracked plate when a/W is less than 0.2, though cracks initiated from edges are unsymmetrical. When a/W is larger than 0.3, R_F becomes larger than 1.1 across a wide range of c/W. Further, the stress intensity factor of a finite plate with an unsymmetrical crack was calculated. Under the calculation conditions employed in the present study, the stress intensity factor of the plate with the unsymmetrical crack could also be approximated within 10% error by that of the center cracked plate.
社団法人日本機械学会の論文
2009-08-25