确认这些区域没有腐蚀、裂纹、排放孔堵塞及其它杂物。如有必要进行清洁。
Make sure that this area has no corrosion, cracks, blocked drain holes, unwanted objects. Clean, if necessary.
分析和应用结果表明，造成销孔凸缘裂纹的原因是制造过程中定位误差等引起的冲击力、销孔的凸缘曲线结构不合理及应力三个因素引起的。
The result of the analysis and application show that the crack of pinhole rib is caused by the impact produced by fix error, the unreasonable structure of pinhole rib and internal stress.
结果表明：应力强度因子随着裂纹和孔的相对尺寸的增加而增加。
It is shown that in general cases, the field intensity factors increase as the ratio of crack length to hole-size become large.
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