This note deals with the rectangular tensile sheet with the single edge defect (crack, half-circular-hole crack and half-square-hole crack) by using the hybrid displacement discontinuity method (a boundary element method) proposed recently by Yan. Detailed solutions of the SIFs of the three plane elastic crack problems are given, which can reveal clearly the effect of geometric parameters of the cracked bodies on the SIFs. By comparing the calculated SIFs of the single edge half-circular-hole crack and the single edge half-square-hole crack with those of the single edge crack, in addition, a shielding effect of the half-circular-hole and the half-square-hole on the SIFs of the single edge crack is discussed. It is illustrated that the boundary element method is simple yet accurate for calculating the SIFs of complex crack problems in finite plate.
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