从渗透检测原理和规则裂纹渗透深度公式入手。推导出不规则裂纹渗透深度的公式。
The formulea for penetrating depthes of irregular cracks were derived from the principle of pene-rant inspection and the formulea for the penetrating depthes of regular cracks.
结果表明：表面裂纹各点的扩展速度与其所处的位置和容器接管的几何参数有关，且其扩展平衡状态为一不规则形状。
The results show that the rate of the growth of each point on the surface crack is connected with the place of crack and the structure of nozzle, and its steady shape is some of complex curve.
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