The result has shown that the fracture was caused by such surface defects as fold crack in section a at connecting rod small end.
结果表明，断裂由连杆小头A截面的表面缺陷(折叠裂纹等)引起。
Decentraction of the conn-rod small end hole center with the excircle center of the conn-rod small end hole blank, which causes the hole wall of one side getting thin with the strength dropping.
连杆小头孔中心与连杆小头孔毛坯外圆中心不同心，使一边孔壁变薄，强度下降。
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